GB2512485A

GB2512485A - A fire suppression system control valve

Info

Publication number: GB2512485A
Application number: GB1403381.5A
Authority: GB
Inventors: David Laurence Melton
Original assignee: Firetrace Ltd
Current assignee: Firetrace Ltd
Priority date: 2013-02-28
Filing date: 2014-02-26
Publication date: 2014-10-01
Anticipated expiration: 2034-02-26
Also published as: GB2512485B; GB201403381D0; GB201303564D0

Abstract

A valve 10 for use in a fire extinguisher includes isolation valve 12 comprising a ball-valve in which a valve 14 provides three channels 20, 22, 24 extending from an outer surface of the valve to a central void 26, effectively forming a T-shaped conduit within the valve 14. The first channel 20 and the second channel 22 provide a linear passageway through the valve member 12. The third channel 24, arranged perpendicularly to both the first channel 20 and the second channel 22, is of a smaller cross-section and provides a bypass vent. The valve 14 is arranged to either open a passageway between a pressurised extinguishant provided in a cylinder and outlet 32 or the valve 14 closes this passageway to prevent extinguishant being released from the cylinder. In both open and closed positions, a channel in the drive stem leads to a pressure gauge such that the pressure within the system can be monitored. The drive stem is concealed when the system is live preventing unauthorised movement of the isolation valve.

Description

A Fire Suppression System Control Valve

FIELD OF THE INVENTION

The present invention relates to a fire suppression system control valve, a fire suppression system including an isolation valve and a method of actuating a fire suppression system.

BACKGROUND TO THE INVENTION

A fire extinguishing system generally includes a pressurised cylinder containing an extinguishant. In some fire suppressions systems this pressurised cylinder can be connected to a length of a detection tubing. The length of the detection tubing comprises an outer wall which is arranged to be ruptured by heat from a nearby fire. Accordingly, with such systems, the extinguishant will be automatically released in the proximity of the fire.

The detection tubing is positioned and secured in a fire risk area for which the system is designed to protect. If a fire subsequently starts within this area then the heat will rupture the detection tubing at the hottest area and this will cause the extinguishant to flow through the rupture in order to extinguish, or at least suppress, the fire. This system is currently available from Firetrace Limited as a direct automatic fire suppression system.

Similar systems are available which are called indirect automatic fire suppressions systems. In these systems, the extinguishant is arranged to be discharged through a diffuser head located on a discharge tube. Accordingly, the extinguishant does not flow through the detection tubing and out of the rupture.

These indirect systems generally include a valve which is controlled by the pressure in the detection tubing such that the valve is opened when pressure is released from the detection tubing. On the release of this pressure the discharge valve opens and the extinguishant flows through the discharge tube and out of the diffuser head.

All of these systems include a valve including an isolation valve located on top of the cylinder of extinguishant. This isolation valve is controllable and configurable between an open position and a closed position. The isolation valve includes a slot into which an end of a screwdriver can be engaged in order for a user to turn the isolator valve between the open and closed positions. The valve also comprises a pressure gauge located below the isolation valve. When the isolation valve is in the closed position, the pressure gauge measures and displays the pressure of the extinguishant within the cylinder. When the isolation valve is in the opened position, the pressure in the detection tubing is equalised with the pressure of the extinguishant in the cylinder. In this position, the pressure gauge will measure and display the pressure within the system (cylinder and detection tubing).

At an upper end of the valve there is a connector on to which the detection tubing is connected, in use. This connector projects outwardly from the valve and this thereby leaves the connector at risk from damage during transit, delivery, and/or installation.

During installation, the fire detection tubing is connected to the valve whilst the isolation valve is in the closed position. At the distal end of the detection tubing there is an adaptor. A pump can be secured to the adaptor to pressurise the detection tubing prior to the opening of the isolation valve. Once pressurised, a gauge is fitted to the adaptor to test for any leaks in the detection tubing.

However, in some arrangements the end of the tubing may be required to be secured in an inaccessible area. This can cause problems when trying to secure a pump and or a test pressure gauge to the end of the detection tubing. If no leak is detected, then the end of the detection tubing can be sealed closed and the isolation valve can be opened such that system is then live and operational.

In practice, there is a risk of leaks occurring around the drive stem of the isolation valve whilst the isolation valve is in the open position. Such leaks cannot be detected until the isolation valve is in the open position. Accordingly, the first time that such a problem may be detected is when the system is fully operational and live. If the leak is significant, then this leak may be detected during the installation process and this may still result in the valve having to be replaced and also the cylinder having to be replaced. Alternatively, if the leak is more gradual then the leak may only be detected if the pressure gauge is rechecked after a period of time and this would then demonstrate that the cylinder and valve need replacing.

In a worst case scenario, if a user does not check the system then this will result in the pressure being slowly drained from the cylinder and the fire extinguishing system would not operate in the event of a fire.

It is an aim of the present invention to overcome at least one problem associated with the prior art, whether referred to herein or otherwise.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention there is provided a fire suppression system control valve, the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve member within the housing.

Preferably the control valve comprises concealing means which is arranged to conceal the distal end of the drive stem.

Preferably the drive stem is arranged to be rotated. Preferably the drive stem is arranged to be rotated about a central longitudinal axis and more preferably about a central longitudinal axis.

Preferably the valve member is arranged to be rotated.

Preferably the valve member comprises a generally spherical member.

Preferably the first channel and the second channel are axially aligned. Preferably the first channel and the second channel form a linear passageway (together with the central void) through the valve member and more preferably through a diameter of the valve member.

The third channel may be perpendicular to the first channel. The third channel may be perpendicular to the second channel.

When the isolation valve is in a closed position, the third channel may align with the main inlet and may provide a perpendicular passageway through the valve member with a passageway extending from a main outlet, through the third channel into the central void and then though the channel in the drive stem to the regulating valve.

When the isolation valve is in an open position, the first channel and the second channel may align with a main inlet and a main outlet and this may provide a linear passageway through the valve member with a passageway extending from the main outlet, through the first channel into the central void and then though the second channel to the main outlet.

Preferably, in the open position, the valve member also provides a perpendicular passageway through the valve member with a passageway extending from the main inlet through the first channel into the central void and then though the channel in the drive stem to the regulating valve.

Preferably in the open position, the valve member also provides a perpendicular passageway through the valve member with a passageway extending from the main outlet through the second channel into the central void and then though the channel in the drive stem to the regulating valve.

The valve member may provide an index lug for locating the isolation valve within the control valve. The index lug may provide a bearing surface to permit the isolation valve to be rotated. The index lug may locate within an index recess provided by the control valve.

The drive stem may locate within a drive stem housing. The drive stem housing may comprise a sleeve. The sleeve may be secured to the control valve and may retain the isolation valve to the control valve whilst permitting the isolation valve to be rotated.

The drive stem of the isolation valve may comprise a sealing member for sealing secure the drive stem within the drive stem housing. The sealing member may comprise an 0 ring.

Preferably the drive stem housing provides the concealing means. The drive stem housing may provide a shroud which may encompass the distal end of the drive stem.

The distal end of the drive stem may be counter sunk within the drive stem housing.

The drive stem housing may provide securement means to enable a pressure gauge to be removable secured thereto. Preferably when the pressure gauge is secured to the drive stem housing, the distal end of the drive stem is inaccessible.

The drive stem housing may comprise a female threaded surface to engage with a male threaded surface provided by a pressure gauge.

The distal end of the drive stem may provide a keyed surface. The keyed surface may comprise a recess and preferably comprises pair of recesses which are radially displaced from a central longitudinal axis. The recesses may be provided in an end surface of the sleeve forming the drive stem.

The distal end of the drive stem may provide a castellated surface. Preferably the distal end of the drive stem is arranged in use, to engage with a keyed surface provided by a tool. The keyed surface may comprise a lug and preferably comprises pair of lugs which are radially displaced from a central longitudinal axis.

Preferably rotation of the tool causes rotation of the drive stem through the meshing of the respective keyed surfaces.

The distal end of the drive stem may comprise an annular surface into which the keyed surface is defined.

The regulating valve may comprise a Schrader valve.

Preferably the concealing means is arranged to conceal the distal end of the drive stem whilst the fire suppression system is live.

Preferably the concealing means inhibits the use of the isolation valve whilst the fire suppressions system is live.

The fire suppression system may comprise a Firetrace fire suppression system.

The control valve may comprise a body which provides the housing for the valve member. Preferably the housing comprises a chamber.

Preferably the control valve comprises a main inlet. Preferably the main inlet extends though the control valve to the housing for the isolation valve.

Preferably the control valve is arranged, in use, to be secured to a pressurised cylinder containing an extinguishant. Preferably the main inlet of the control valve is arranged to be in communication with the contents of the pressurised cylinder.

Preferably the control valve comprises a connector. Preferably a fire detection tubing is securable to the connector. Preferably the fire detection tubing comprises a pressurised tube.

The control valve may comprise a cover for the connector which may be used to cover (and protect) the connector whilst a fire detection tubing is disconnected from the connector. The cover may be provided by a tool and preferably is provided by a tool which provides the movement means to engage with the distal end of the drive stem.

Preferably the control valve comprises a commissioning port.

Preferably a commissioning pressure gauge is removably securable to the commissioning port.

Preferably pump means is removably securable to the commissioning port. The pump means may comprise a pressurised cylinder.

Preferably the commissioning port is in communication with the connector.

Preferably, in use, a pump means (a pump and/or a pressurised cylinder) is securable to the commissioning port in order to pressurise a fire detection tubing secured to the connector.

Preferably the control valve comprises a main outlet extending from the housing for the isolation valve. The main outlet may be in communication with the connector.

The control valve may comprise a discharge chamber. The discharge chamber may locate between the main outlet and the connector. The discharge chamber may connect the main outlet to the connector.

The discharge chamber may be in direct communication with the connector.

The discharge connector may contain a discharge valve. The discharge valve may be controlled by the fire detection tubing.

The control valve may comprise a discharge port. The discharge port may be arranged, is use, to be secured to a discharge tube. The discharge tube may have a diffuser head and may have a diffuser head at an end thereof. The diffuser head may be arranged to diffuse the extinguishant on detection of a fire.

The discharge valve may be maintained in a closed position by the pressure within the fire detection tubing. The discharge valve may open on the release of the pressure from the fire detection tubing.

In the open position, the discharge valve may provide a passageway from the main outlet to the discharge port.

In the closed position, the discharge valve may close the main outlet.

The fire detection tubing may comprise a sealed distal end. A proximal end of the fire detection tubing may be arranged, in use, to be secured to the connector of the control valve.

The valve member may be integral with the drive stem.

The valve member and the drive stem preferably comprise a single component.

The present invention may provide a fire suppression system control valve comprising a control valve for a fire suppression system.

The system may comprise indicator means to indicate the status of the fire suppression system.

The indicator means may comprise a first reed switch and a second reed switch which may be mounted in a housing and the first reed switch may be arranged substantially perpendicular to the second reed switch. The valve member may comprise a magnet and preferably a disc magnet mounted on an index lug.

Preferably, the disc magnet is therefore arranged to be rotatable relative to the reed switches such that the plane of the disc magnet may be perpendicular with the first reed switch (and co-planar with the second reed switch) or perpendicular with the second reed switch (and co-planar with the first reed switch). The second reed switch may be located closer to the disc magnet compared to the first reed switch. Preferably the first reed switch is longer than the second reed switch.

The indicator means may comprise display mean to provide a visual display of the status of the fire suppression system. The display means may be located adjacent to the control valve. The display means may be located remote from the control valve. The display means may comprise a first (green) light to indicate when the fire suppression system is active and a second (red) light to indicate when the fire suppression system is inactive.

According to a second aspect of the present invention there is provided a fire suppression system comprising a pressurised cylinder containing an extinguishant, a control valve secured to the pressurised cylinder and a fire detection tubing secured to the control valve, the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve member within the housing Preferably the control valve comprises concealing means which is arranged to conceal the distal end of the drive stem.

According to a third aspect of the present invention there is provided a method of actuating a fire suppression system comprising securing a control valve to a pressurised cylinder containing an extinguishant, wherein the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve member within the housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be described, by way of example only, with a reference to the drawings that follow, in which: Figure 1 is a side schematic view of a direct valve in accordance with a preferred embodiment of the present invention; Figure 2 a side cross section schematic view of a multi-function tool for use with a valve in accordance with a preferred embodiment of the present invention; Figure 3a is a side schematic view of an indirect low pressure valve in accordance with a preferred embodiment of the present invention; Figure 3b is a side schematic view of an indirect low pressure valve in accordance with an alternative embodiment of the present invention; Figure 4 is a front schematic view of an indirect high pressure valve in accordance with a preferred embodiment of the present invention; Figure 5 is a side schematic view of an indirect high pressure valve in accordance with a preferred embodiment of the present invention; Figure 6 is a schematic view of a rear view of an embodiment of a sensing collar for use with the present invention; and Figure 7 is a cross-sectional schematic view of an embodiment of a sensing collar mounted to a control valve of a fire suppression system.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

As shown in Figure 1, a direct low pressure valve 10 for use in a fire extinguishing system. The valve 10 includes an isolation valve 12 in accordance with the present invention. In particular, the isolation valve 12 comprises a ball valve in which a valve member 14 provides three channels 20, 22, 24 which all extend from an outer surface of the valve member to a central void 26. These three channels 20, 22, 24 effectively form a T-shaped network or conduit within the valve member 12 (as shown in Figure 4). In particular, the first channel 20 is arranged linearly with the second channel to provide a linear passageway through the valve member 12. The third channel 24 is arranged perpendicularly to both the first channel 20 and the second channel 22. The third channel 24 is of a smaller cross section and provides a by pass vent as will be described.

Accordingly, the first channel 20 and the third channel 24 define a perpendicular passageway through the valve member 14 and, similarly, the second channel 22 and the third channel 24 also provide a perpendicular passageway through the valve member 14.

The valve member 14 is located within a housing 18. As shown in Figure 1, the housing 18 includes a main inlet 30 and a main outlet 32. The housing 18 also provides a drive passage 17 into which the drive stem 16 of the isolation valve 12 locates. The main inlet 30 is arranged, in use, to be in direct communication with the interior of a pressurised cylinder containing the extinguishant. The main outlet 32 is arranged to be selectively connected to this pressurised extinguishant in the cylinder (not shown) through the configuration of the isolation valve 12.

Accordingly, the valve member 14 is arranged to either open a passageway between the pressurised extinguishant provided in the cylinder and the main outlet 32 or the valve member 14 closes this passageway to prevent extinguishant being released from the pressurised cylinder.

In both an open and a closed position, a channel in the drive stem provides a passageway to a pressure gauge such that the pressure within at least a part of the system can be monitored in both configurations. The distal end of the drive stem is concealed when the system is live and this prevents unauthorised movement of the isolation valve and also helps to seal the drive stem within the system.

The valve member 14 is effectively a spherical member and locates within a chamber provided by the housing 18 within the valve 10. The housing 18 of the valve member includes sealing members in the form of PTFE sealing disks 31, 33 which surround the openings of the main inlet 30 and the main outlet 32.

The valve member 14 is rotatable within the housing to selectively align the inlets/outlets. The isolation valve 12 and the associated housing 18 are arranged to be aligned to provide two different configurations of fluid passageways through the valve member 14. The isolation valve 12 may provide a straight linear open passageway or the isolation valve may provide a closed passageway. However, in the closed configuration the main inlet 30 will be aligned with the third channel 24 and this provides a monitoring configuration (as shown in Figure 1) as will be described later.

The drive stem 16 of the isolation valve 12 provides a central conduit 19 extending from the void 26 in the central area of the valve member 14. This conduit 19 thereby provides an auxiliary outlet/inlet. The conduit 19 extends through the drive stem 16 into which a valve 40 is located to regulate the flow into/out of the conduit 19. In particular, the conduit 19 includes a Schrader valve 40 to regulate the flow into or out of the conduit 19 in the drive stem 16.

The drive stem 16 also includes a concealed engaging surface 42 which is arranged to register with an end of a tool 50 or key (as shown in Figure 2). This tool 50 is arranged to rotate the drive stem 16 which thereby rotates the valve member 14.

In use, the multi-function tool 50 is provided with the required key surface 52. This key surface 52 is engaged with the end of the drive stem 16 and the valve member 14 is rotated to align the channels 20, 22, 24 in the valve member 14 with the required main inlet 30 or main outlet 32. The valve member 14 effectively provides four surfaces on the outer spherical surface of the valve member 14.

These are a first inlet from the first channel 20 and a first outlet from the second channel 22 which combine to form a linear conduit through the valve member 14.

Perpendicular to these, there is a by-pass vent from the third channel 24 which is directly opposite a closed surface. As the valve member 14 is rotated, an inner part of the housing will align with the first inlet (20) and then the by-pass vent (24) and then the second inlet (22) and then the closed surface and then back round to the first inlet (20) etc. The isolation valve 12 includes an indexing key 21 which locates within a bearing portion of the valve 10 which enables the isolation valve 12 to be easily rotated along a longitudinal rotation axis of the drive stem 16.

The Schrader valve connector of the drive stem 16 is arranged to selectively engage with pressure measuring means (e.g. a contents gauge 60). The gauge is selectively engaged in order to measure the pressure of the enclosed volume in communication with the drive stem conduit 24. The gauge 60 includes a threaded male surface 62 which engages with a female threaded surface provided in the isolation valve port 64. In addition, the male threaded surface 62 includes an 0' ring seal 63.

As shown in Figure 1, a direct valve 10 for use in a Firetrace fire extinguishing system includes an isolation valve 12 located above the inlet from the cylinder 30.

The direct valve 10 includes a connector 70 on the upper face on to which a fire detecting tubing can be connected. The valve 10 also includes a commissioning gauge 80. The commissioning gauge 80 is removably secured within a commissioned port (not shown).

In transit and prior to installation, the contents of the cylinder are closed and the outlet 30 from the cylinder is arranged to be in communication with the bypass vent 24. Accordingly, the pressure within the central void 26 of the valve member 14 will be the same as that of the cylinder and a contents gauge 60 can be connected to the Schrader valve 40 of the drive stem 16 in order to display the pressure of the cylinder.

Whilst in this configuration, a fire detecting tubing can be connected to the connector 70 and the tubing can be secured around the required area. Once the tubing has been installed, a pump is connected to an inlet port (the commissioning port, not shown) located on the valve 10 above the isolation valve 12. This commissioning port connector may be revealed by the removal of the commissioning gauge 80. The pump is secured to the commissioning port and the pump is used to pressurise the fire detecting tubing. The pressure within the detection tubing is increased to a level which is equal to the contents of the pressurised cylinder.

The direct valve 10 includes the commissioning gauge 80 which can be used to control the amount of pressure introduced by the pump. Once pressurised, the pump can be disconnected. The commissioning gauge can then be secured to the commissioning port and it can be used measure the pressure introduced by the pump and also to monitor for leaks for a period of time, for example 10 minutes. If there are no leaks detected then the system is ready to be made live by actively connecting the pressurised extinguishant to the detecting tube.

The multi function tool 50 is engaged with the drive stem 16 and this is rotated until the first channel aligns 20 with the main inlet 30 from the cylinder. In this position, the second channel 22 of the valve member 14 will be aligned with the main outlet 32. Accordingly, the valve member 14 will provide a linear passageway for the extinguishant from the pressurised cylinder to the fire detecting tube. As with existing Firetrace systems, if the fire detecting tube is now ruptured, the pressurised extinguishant will flow from the cylinder and out of the rupture to suppress the adjacent heat source/fire.

In the live configuration, a contents gauge 60 can be left secured to the Schrader valve 40 of the drive stem 16. This will provide a further seal to prevent any leaks from around the drive stem 16.

As shown in Figure 3a, a fire suppression system may comprise an indirect low pressure valve 110. In this system, a discharge tube is connected to a discharge port 112 provided on the indirect low pressure valve 110. This discharge port 112 locates above the isolation valve 12 and below the connector 170 for the detection tube. The valve 110 includes a discharge valve 111 located above the isolation valve 12 and this valve 111 is maintained in a closed position until the detection tube is ruptured. On a rupture of the detection tube, the pressure is released and this moves a valve member 111 which then provides a passageway from the main outlet 132 of the housing 18 of the isolation valve 12 through to the discharge port 112 and the connected discharge tube. A diffuser head is located on the discharge tube and this provides an outlet for the extinguishant and directs it to a predetermined place.

Again, in this indirect low pressure valve 110, there is an isolation valve 12 comprising a rotatable valve member 14 and a rotatable drive stem 16. The valve member is contained within a housing 118 of the control valve 110. This drive stem 16 includes the Schrader valve 40 which enables a contents gauge 60 to be removably secured thereto. Accordingly, this contents gauge 60 can monitor the pressure of the cylinder when the drive stem 16 is in the closed position with the bleed valve 24 aligned with the main inlet 130. When the isolation valve 12 is in the open position, the first channel 20 aligns with the main inlet 130 and the second channel 22 aligns with the main outlet 132. In this position, the contents gauge 60 will be able to display the pressure within the live system.

As with the direct valve 10, there is a commissioning gauge (not shown) and a port (not shown) for pressurising the detection tube with a pump or a pressurised cylinder. These are located above the discharge valve member 111.

In an alternative embodiment of the present invention shown in Figure 3b, a fire suppression system comprises a discharge port 112 which locates below the isolation valve 12 and below the connector 170 for the detection tube. The valve includes a discharge valve 111 located below the isolation valve 12 and this valve 111 is maintained in a closed position until the detection tube is ruptured.

On a rupture of the detection tube, the pressure is released and this moves a valve member 111 which then provides a passageway from the outlet 130 of the cylinder through to the discharge port 112 and the connected discharge tube. As previously mentioned, a diffuser head may be located on the discharge tube and this provides an outlet for the extinguishant and directs it to a predetermined place.

Again, in this indirect low pressure valve 110, the mechanism is the same as previously described above. The main difference being that the isolation valve locates above the discharge valve. The control valve will still function as essentially described above.

A further embodiment is shown in Figure 4 and Figure 5 and this relates to an indirect high pressure valve 210 which again incorporates an isolation valve 12 in accordance with a present invention. Again, in the valve 210 there is a discharge port 212 connected to a discharge tubing with a diffuser head located at an end thereof. The system includes a detection tubing connected to a connector 270.

Accordingly, this system is arranged for the detection tubing to detect the fire and then to cause a discharge of the extinguishant from the diffuser head which will be located at a predetermined location.

The isolation valve 12 is again located directly above the main outlet 230 from the pressurised cylinder and provides a port 64 for a removable contents gauge 60.

As before, the removable contents gauge 60 will display the pressure of the cylinder whilst the isolation valve 12 is in the closed position.

The removable contents gauge 60 can then be removed in order for the multifunction tool 50 to rotate the drive stem 16, and hence the valve member 14 to an open position wherein the valve member 14 will provide a linear passageway from the main outlet 230 of the cylinder to an inlet 232 which is in communication with a discharge valve 211 which will open on the rupture of the detection tube.

The control valve 210 also comprises a pressure relief valve located in the low pressure chamber.

The valve member 14 also provides the bypass channel 24 which will enable the contents gauge 60 to be removably secured to the Schrader valve 40 and this will again display the pressure of the contents of the pressurised cylinder.

The isolation valve 12 of the present invention is provided within a drive housing 64 including a concealing shroud such that the actuating portion 42 of the isolation valve 12 is hidden from direct view. This inhibits the unauthorised use of the isolation valve 12 and will prevent the isolation valve 12 from being tampered with either inadvertently or on purpose. This thereby helps to protect the integrity of the system. In previous systems, an isolation valve 12 was exposed which enabled third parties to tamper with the isolation valve and to possibly switch the system off inadvertently or on purpose. In addition] the isolation valve was exposed and this meant that the valve could be damaged and this posed a problem with leaks occurring around the isolation valves. The present invention provides a concealed isolation valve 12 which will provide a removable contents gauge 60 located over the drive stem 16 such that this will provide a further sealing member to restrict or inhibit leaks from occurring around the drive stem 16.

In the preferred embodiments of the control valve of the present invention, the commissioning gauge is removable so the filling adaptor can be fitted to connect an air pump or a pressurising cylinder. The same gauge port then takes the pressure switch when commissioning is complete. The switch may have the same M10 x 1 thread and 0 ring arrangement as the gauge so either can be fitted to the gauge/switch ports which are identical. Either the switch or the gauge can be removed under pressure as the Schrader closes before the 0 ring disengages.

This feature allows either the switch or the gauge to be removed and tested during servicing.

In the high pressure valve arrangement, the isolation valve may be located at the top of the control valve in order to control the 1 Obar regulated pressure rather than in the lower part of the control valve controlling the 7obar cylinder pressure for ease of manufacture. However, the isolation valve in accordance with the present invention would remain essentially the same except for the location within the control valve and the important feature of the ball valve (isolation valve) with a Schrader is maintained.

A pressure switch may be connected to the control valve. A self contained alarm sounder comprising a stand alone audible alarm may be connected to one these pressure switches. The sounder works on a normally open circuit. The pressure switch may provide confirmation that the system has been discharged.

The present invention may also include an indicator to indicate whether the isolation valve is an open or a closed position. Once the isolation valve has been turned or rotated into either an open or a closed position, it is particularly useful if an indicator can be easily seen to show whether the fire suppression system is active or not. It is possible to insert the key to check the position of the valve but the present invention may also include a continuously acting method of showing the status of the fire suppression system which does not require any user intervention.

The indicator includes sensing means and display means wherein the display means may be located adjacent to the control valve or located remotely from the control valve. The display means may include a first light of a first colour to indicate when the control valve is active and a second light of a second colour to indicate when the control valve is not active. For example, the display means may include a green light which indicates that the valve member 14 has been rotated to a position in which the first channel 20 and the second channel 22 are aligned in order to directly provide a passageway from the main inlet 30 to the main outlet 32. In this configuration, the discharge means of the fire suppression system is directly linked with the internal volume of the pressurised cylinder containing the fire extinguishant. Accordingly, a user can quickly and easily determine that the fire suppression system is active by the indication of the green light. Similarly, the display means may include a red light which is activated when the first and second channels 20, 22 are not forming a passageway between the main inlet 30 and the main outlet 32. In particular, the third channel 24 may be aligned with the main inlet 30 such that the pressure within the cylinder can be tested with a removable contents gauge 60. -20 -

The sensing means is arranged to be detachably mounted to the control valve 10.

In particular, the sensing means 300 includes a collar 302 which is arranged to be simply pushed onto the control valve. The collar provides a push fit or snap fit connection around the outer periphery of the control valve. As shown in Figure 6 and Figure 7, the sensing collar 302 is arranged to locate around the cylindrical control valve such that an internal surface 303 fits adjacent to the external surface of the control valve. In addition, the sensing collar 302 may be arranged to locate below a discharge port 312 such that the sensing means of the sensing collar registers with the isolation valve. The sensing collar 302 or sleeve may be slidably mounted on the control valve such that once it has been snapped on it can be moved upwardly or downwardly into the correct position.

The isolation valve includes a magnet and specifically a disc magnet 308 mounted thereon. In the preferred embodiment, the disc magnet 308 is secured within a recess of the indexing key 21 such that the disc magnet 308 will be rotated with the indexing key 21 of the isolation valve. In use, the disc magnet 308 will be rotated from a position in which the central plane of the disc magnet 308 is substantially horizontal to a position in which the plane of the disc magnet 308 is substantially vertical. The central plane of the disc is taken to mean the plane which bisects the disc into two equal discs of half height relative to the full disc.

The sensing means 300 comprising the sensing collar 302 can be pushed onto and pulled off the control valve. On the internal surface 303 of the sensing collar 302 there is provided a recess or recesses into which sensing switches can be mounted. In particular, the recess provides a substantially cross shaped recess into which a first reed switch 304 and a second reed switch 306 can be mounted.

The second reed switch 306 is arranged to be located over the first reed switch 304 with respect to the control valve. In this arrangement, the second reed switch is located nearer to the disc magnet 308 compared to the first reed switch 304.

Accordingly, the first reed switch 304 is dimensionally larger (or longer) than the second shorter reed switch 306 such that both reed switches 304, 306 will be reliably operated by the same disc magnet 308. The disc magnet 308 is arranged -21 -to induce a magnetic field within the reed switches 304, 306 in order to close the relevant reed switch which will then activate a respective light located within a circuit connected to the respective reed switch. The reed switches 304, 306 are normally open reed switches which are closed when a suitable magnetic field is present. The reed switches 304, 306 are closed when the disc magnet is essentially perpendicular or within an angle of 45° and 135°. The recesses and hence the reed switches 304, 306 may be covered by a sticker or other cover such that the switches are not inadvertently knocked and this cover thereby provides some protection to the arrangement.

When the disc magnet 308 is horizontal, the isolation valve is open and the fire suppression system is active. In this position, the horizontally mounted disc magnet 308 will close the first longer reed switch 304 and the first reed switch 304 is located within a circuit which activates the green light of the display means. As the drive stem 16 of the isolation valve is rotated, the disc magnet 308 similarly rotates towards a vertical orientation in which the plane of the disc magnet 308 will be vertical. When the disc magnet 308 is in the vertical orientation, a magnetic field will be induced in the second shorter reed switch 306 but not in the first reed switch 304. This second reed switch 306 is located within a circuit which includes the red light. Accordingly, in this configuration, the red light will be activated in order to indicate that the fire suppression system is not active.

As the drive stem 16 of the isolation valve is rotated, the arrangement is such that the first reed switch 304 will become deactivated during this rotational movement and the second reed switch 306 will become activated. The position of this transition may occur at an angle of approximately 45° to the horizontal position and this transition will be instantaneous.

Overall, the present invention provides the possibility of having a retrospectively fitted indicator to quickly and easily display whether the fire suppression system is active or not. The indicator may comprise any suitable indication means and may be located remote from the control valve. The lights may be wired to the switches -22 -or the indicator circuits may included a transmitter and receiver arrangement such that the lights (or other display means) are connected wirelessly and possibly at a significantly greater distance compared to a hardwired system. -23 -

Claims

CLAIMS1. A fire suppression system control valve, the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve member within the housing.
2. A fire suppression system control valve according to Claim 1 in which the control valve comprises concealing means which is arranged to conceal the distal end of the drive stem.
3. A fire suppression system control valve according to Claim 1 or Claim 2 in which the drive stem is arranged to be rotated about a central longitudinal axis.
4. A fire suppression system control valve according to any preceding claim in which the valve member is arranged to be rotated.
5. A fire suppression system control valve according to any preceding claim in which the valve member comprises a generally spherical member.
6. A fire suppression system control valve according to any preceding claim in -24 -which the first channel and the second channel are axially aligned and the first channel and the second channel form a linear passageway together with the central void through a diameter of the valve member.
7. A fire suppression system control valve according to any preceding claim in which the third channel is perpendicular to the first channel and the third channel is perpendicular to the second channel.
8. A fire suppression system control valve according to any preceding claim in which, when the isolation valve is in a closed position, the third channel is aligned with the main inlet and provides a perpendicular passageway through the valve member with a passageway extending from the main inlet through the third channel into the central void and then though the channel in the drive stem to the regulating valve.
9. A fire suppression system control valve according to any preceding claim in which, when the isolation valve is in an open position, the first channel and the second channel are aligned with a main inlet and a main outlet and this provides a linear passageway through the valve member with a passageway extending from the main inlet, through the first channel into the central void and then though the second channel to the main outlet.
10. A fire suppression system control valve according to Claim 9 in which, in the open position, the valve member also provides a perpendicular passageway through the valve member with a passageway extending from the main inlet through the first channel into the central void and then though the channel in the drive stem to the regulating valve.
11. A fire suppression system control valve according to Claim 9 or Claim 10 in which, in the open position, the valve member also provides a perpendicular passageway through the valve member with a passageway extending from the main outlet through the second channel into the central void and then though the channel in the drive stem to the regulating valve. -25 -
12. A fire suppression system control valve according to any preceding claim in which the valve member provides an index lug for locating the isolation valve within the control valve, wherein the index lug provides a bearing surface to permit the isolation valve to be rotated and, in which, the index lug locates within an index recess provided by the control valve.
13. A fire suppression system control valve according to any preceding claim in which the drive stem locates within a drive stem housing comprising a sleeve and, in which, the sleeve is secured to the control valve and retains the isolation valve to the control valve whilst permitting the isolation valve to be rotated.
14. A fire suppression system control valve according to Claim 13 in which the drive stem of the isolation valve comprises a sealing member for sealing secure the drive stem within the drive stem housing.
15. A fire suppression system control valve according to Claim 13 or Claim 14 in which the drive stem housing provides a concealing means and, in which, the drive stem housing provides a shroud which encompasses the distal end of the drive stem.
16. A fire suppression system control valve according to any one of Claim 13 to Claim 15 in which the distal end of the drive stem is counter sunk within the drive stem housing.
17. A fire suppression system control valve according to any one of Claim 13 to Claim 16 in which the drive stem housing provides securement means to enable a pressure gauge to be removable secured thereto.
18. A fire suppression system control valve according to any one of Claim 13 to Claim 17 in which, when the pressure gauge is secured to the drive stem housing, the distal end of the drive stem is inaccessible.

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19. A fire suppression system control valve according to any preceding claim in which the distal end of the drive stem provides a keyed surface.
20. A fire suppression system control valve according to Claim 19 in which the keyed surface comprises pair of recesses which are radially displaced from a central longitudinal axis and, in which, the recesses are provided in an end surface of a sleeve forming the drive stem.
21. Afire suppression system control valve according to any preceding claim in which the distal end of the drive stem is arranged in use, to engage with a keyed surface provided by a tool wherein the keyed surface comprises pair of lugs which are radially displaced from a central longitudinal axis and, in which, rotation of the tool causes rotation of the drive stem through the meshing of the respective keyed surfaces.
22. A fire suppression system control valve according to any preceding claim in which the regulating valve comprises a Schrader valve.
23. A fire suppression system control valve according to any preceding claim in which a concealing means is arranged to conceal the distal end of the drive stem whilst the fire suppression system is live.
24. A fire suppression system control valve according to any preceding claim in which a concealing means inhibits the use of the isolation valve whilst the fire suppressions system is live.
25. A fire suppression system control valve according to any preceding claim in which the fire suppression system comprises a Firetrace fire suppression system.
26. A fire suppression system control valve according to any preceding claim in which the control valve comprises a body which provides the housing for the valve member with the housing comprising a chamber. -27 -
27. A fire suppression system control valve according to any preceding claim in which the control valve is arranged, in use, to be secured to a pressurised cylinder containing an extinguishant and, in which, a main inlet of the control valve is arranged to be in communication with the contents of the pressurised cylinder.
28. A fire suppression system control valve according to any preceding claim in which the control valve comprises a connector wherein a fire detection tubing is securable to the connector.
29. A fire suppression system control valve according to Claim 28 in which the control valve may comprise a cover for the connector which is used to cover (and protect) the connector whilst a fire detection tubing is disconnected from the connector.
30. A fire suppression system control valve according to Claim 29 in which the cover is provided by a tool which provides the movement means to engage with the distal end of the drive stem.
31. A fire suppression system control valve according to any preceding claim in which the control valve comprises a commissioning port and, wherein, a commissioning pressure gauge is removably securable to the commissioning port.
32. A fire suppression system control valve according to any preceding claim in which the control valve comprises a main outlet extending from the housing for the isolation valve and the main outlet is in communication with a connector.
33. A fire suppression system control valve according to any preceding claim in which the fire detection tubing comprises a sealed distal end and, in which, a proximal end of the fire detection tubing is arranged, in use, to be secured to a connector of the control valve.
34. A fire suppression system control valve according to any preceding claim in -28 -which the valve member is integral with the drive stem and the valve member and the drive stem comprise a single component.
35. A fire suppression system comprising a pressurised cylinder containing an extinguishant, a control valve secured to the pressurised cylinder and a fire detection tubing secured to the control valve, the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve member within the housing
36. A fire suppression system according to Claim 35 in which the system comprises indicator means to indicate the status of the fire suppression system.
37. A fire suppression system according to Claim 36 in which the indicator means comprises a first reed switch and a second reed switch which is mounted in a housing and the first reed switch is arranged substantially perpendicular to the second reed switch.
38. A fire suppression system according to Claim 37 in which the valve member comprises a disc magnet mounted on an index lug and the disc magnet is -29 -arranged to be rotatable relative to the reed switches such that the plane of the disc magnet is perpendicular with the first reed switch and co-planar with the second reed switch or perpendicular with the second reed switch and co-planar with the first reed switch.
39. A fire suppression system according to Claim 38 in which the second reed switch is located closer to the disc magnet compared to the first reed switch and the first reed switch is longer than the second reed switch.
40. A fire suppression system according to any one of Claim 36 to Claim 39 in which the indicator means comprises display mean to provide a visual display of the status of the fire suppression system.
41. A fire suppression system according to Claim 40 in which the display means comprises a first light to indicate when the fire suppression system is active and a second light to indicate when the fire suppression system is inactive.
42. A method of actuating a fire suppression system comprising securing a control valve to a pressurised cylinder containing an extinguishant, wherein the control valve comprising an isolation valve including a valve member and a drive stem, the drive stem being moveable within the control valve in order to move the valve member within a housing of the control valve, the valve member comprising: a central void, and a first channel, a second channel and a third channel in which each channel extends from the central void to an external surface of the valve member in order to provide respective passageways from the central void through the valve member, the drive stem comprising a channel providing a passageway from the central void of the valve member to a distal end of the drive stem, the channel of the drive stem including a regulating valve located therein in order to regulate the fluid flow therethrough, wherein the distal end of the drive stem is arranged to be engaged by movement means and for the drive stem to be moved in order to move the valve -30 -member within the housing.
43. A fire suppression system control valve substantially as herein described, with reference to, and as shown in, any of the accompanying Figures.
44. A fire suppression system substantially as herein described, with reference to, and as shown in, any of the accompanying Figures.
45. A method of suppressing a fire substantially as herein described, with reference to, and as shown in, any of the accompanying Figures.