DE3146270A1 - Gate valve - Google Patents

Abstract

In a gate valve for opening and closing connecting openings (2, 3) between two spaces (2a, 3a), consisting of a) a valve housing (1) having two connecting openings (2, 3), b) a closing body (4) having gate surfaces (5, 6) which can spread laterally at least against one of the connecting openings (2, 3), c) an operating device (10) having a push rod (11) for displacing the closing body (4) into and out of the closed position (23) and for spreading the gate surface(s) (5, 6) against the connecting opening(s) (2, 3), and d) a simple design, with good sealing and a high operating speed that are not impaired, is achieved for an end stop (16) for the closing body (4) in the desired closing position in that e) the closing body (4) and the gate surface(s) (5, 6) form a hollow body (7) filled with fluid and f) a displacement ram (8), which is operatively connected to the operating device (10), is arranged on the hollow body (7) for pressure loading. <IMAGE>

Description

3H6270

The invention relates to a gate valve according to the preamble of patent claim 1. Such a gate valve is ζ. B. from DE-OS 26 01 120 known. This type of gate valve can be used to open and close of connecting openings between different types of rooms. So it can be about Pipelines, containers (e.g. the inside of the container is one space, the outside the other space) and the like act more. When the gate valve is open, the connection openings allow a wide variety of materials, how gases, liquids or solid particles are transported. It is with the gate valves in question possible, fast and low-friction the displacement of the closure body between the closed position and the Carry out open position and a secure seal towards the rooms in the closed position by expanding to achieve the shut-off surfaces of the closure body against the connection opening (s). Under connection openings are the two connection openings of the Understand valve housing to the respective adjoining space.

Since the actuation device is used both for moving the The closure body is also responsible for the expansion of its shut-off surfaces against the openings at the same time, It requires a relatively high mechanical effort in order to achieve the desired speed when moving the closure body to connect with a high tightness of the shut-off surfaces with respect to the openings.

-G-

It is therefore the object of the invention to provide a more simply constructed Realize gate valve of the type described above.

This object is achieved by the features of claim 1; Developments of the invention emerge from the Subclaims.

It goes without saying that the shut-off surfaces forming the fluid-filled hollow body together with the closing body must be movable and fluid-tight with respect to the closure body; z. B- the hollow body can be a fluid system, in which the closing body represents a fluid cylinder and the shut-off surface (s) with the working stamp (s) are firmly connected or part of them. The displacement ram arranged on the hollow body for the application of pressure is preferably in a direction approximately transverse to the direction of the surface normal (s) of the connection opening to be closed (en), so that the operative connection to the actuating device is possible in a simple manner (the displacement of the closure body takes place transversely to the direction the connection openings dominated by the valve). The stamp of displacement must work together be arranged with the hollow body on it that when it is actuated, the fluid in the hollow body is locally limited by its Displacement is pressurized, so that the pressure building up against the expansion of the shut-off surface (s) the connection opening (s) can cause. With the fluid it is preferably a liquid because of its incompressibility.

It is not necessary that the connection openings are parallel are to each other, as required according to the state of the art to achieve a uniform seal was because the contact pressure of the shut-off surfaces against the edges of the connection openings, which may be provided with seals is the same size everywhere. With lower requirements for tightness, or if the gate valve z. B. the Mastered the outlet opening of a container, it is possible to master only one of the two connection openings in the valve housing with a shut-off surface.

The gate valve according to the invention has the advantage of a mechanically extremely simple structure, great functional reliability, quick operability and high tightness; In addition, the fluid-filled hollow body can very easily be mounted or checked through an inspection flap in the valve housing The inspection flap is arranged on the side opposite the actuating device recommends on the valve body. The hollow body can advantageously can be manufactured and used as a modular component. Surprisingly, in the case of the invention Gate valve a self-holding effect in the event that the effective force of the Actuator wears off once.

A particularly simple design of the hollow body and displacement die results when, in a further development of the invention, the displacement ram seals the wall of the hollow body take action; O-rings or Similar acting sealants can be used. This solution

increases the self-holding capacity of the gate valve in the closed position compared to the principle also possible solutions where the displacement stamp is on an elastic membrane acts in the hollow body wall. 5

Due to the tensile and pressure-resistant connection of the displacement die proposed in a further development of the invention with the push rod of the actuating device it is achieved that the opening of the gate valve is achieved solely by the actuating device itself, without the aid of springs and the like that support the opening will. The end of the push rod preferably serves as the displacement ram penetrating the wall of the hollow body in a sealed manner. This ensures that the displacement stamp and the hollow body do not have to be positively connected to one another, since the latter of a ^ any movement of the Push rod follows; this simplification results from that the fluid is sealed in the hollow body.

The elastic material recommended in a further development of the invention Membrane between the closure body and the shut-off surface (s) is a simple means of both of these Parts fluid-tight, e.g. B. by Vuikanisierung to connect and the necessary stroke of the shut-off surfaces in relation to the To guarantee sleeping bodies; also can through appropriate Shaping of the membrane a spring effect can be achieved, which is soft when the displacement die is de-energized Lifting the shut-off surfaces supported by the connection openings. One further proposed, on the shut-off roofs acting, tensile stress device in the hollow body, such as a

Q _

Tension spring or the like, between the closing body and the shut-off surfaces or between the shut-off surfaces, can do the above-described lowering movement of the shut-off areas support effectively from the connection openings. 5

The acting as a counter bearing to the working direction of the push rod in the closed position on the closing body and the build-up of a spreading pressure for the shut-off surfaces causing the end stop is adjustable according to the invention to to be able to vary the desired end positioning of the closure body; thus also the achievement of a Partial shut-off with the gate valve is possible, namely when the end stop completely covers the Connection openings caused by the shut-off surfaces.

The known guide devices for the closure body to facilitate movement by reducing frictional resistance is preferred by Guide pins - possibly in the form of ball bearings - achieved between the valve housing and the hollow body.

In a further development of the invention, fluid-operated actuating devices are particularly preferred, in particular reduce the duration of the opening and closing process considerably in the case of pneumatic actuation devices.

Due to the sealing that is also recommended according to the invention Connection between the actuating device and the valve housing, leaks are prevented on one side; here z. B. a threaded connection can be used in which a threaded shoulder on the housing of the actuating device is penetrated sealingly by the push rod -

- 10 -

this is particularly recommended for fluid-operated actuating devices. - Of course it can Actuating device can also be fully integrated into the valve housing. - The solutions described above are particularly suitable for the modular design of the gate valve, in which standardized valve housings, hollow bodies and actuating devices are combined with one another can be.

Further objects, features, advantages and possible applications of the present invention emerge from the following Description of an exemplary embodiment based on the accompanying drawing. All described and / or graphically represented features alone or in any meaningful combination the subject matter of the present Invention also regardless of how they are summarized in the claims or their dependency.

In the drawing show:
20th

Fig. 1 a shows a gate valve in partial section transversely to

Direction of the connection openings;

FIG. 1 b shows the gate valve according to FIG. 1 a in a side view;

Fig. 2 shows a gate valve with a single shut-off surface in partial section transverse to the direction of the Connection openings.

In Fig. 1, a valve housing 1 has connecting openings 2, 3 between the spaces 2a and 2, not shown here

- 11 -

3a on. A closure body 4 forms together with it, which is displaceable and sealingly connected with respect to it Shut-off surfaces 5, 6 a hollow body 7. On the hollow body 7 a displacement ram 8 is arranged, which the wall of the closure body 4 (hollow body wall) laterally sealed grips through; a guide flange 9 on the closure body 4 serves for this purpose.

An actuating device 10 with a push rod 11 stands with the displacement ram 8 in pressure and tension-proof operative connection, in the latter the end piece of the push rod represents itself. The actuating device 10 is fluid-operated and has a working cylinder 12 Inlet and outlet for fluid 13 and 14. About a Threaded connector 15 is a sealed connection to the valve housing 1, the push rod 11, ζ. B. within of the threaded connector is guided in a fluid-tight manner.

An adjustable end stop 16 - e.g. B. a screw in the inspection flap 17 opposite the actuating device 10 acts on a z. B. helical Closure 18 in the closure body 4 opposite the actuating device 10 for filling or draining the fluid in the hollow body 7. This is the displacement of the closure body 4 limited and in the correct or desired end position of the closure body 4 causes a Further pressure on the push rod 11 causes the displacement punch 8 to penetrate deeper into the hollow body 7 and causes the shut-off surfaces 5, 6 to expand against the sealing surfaces 19, 20 on the edge of the hollow body

- 12 -

3H6270

Connection openings 2, 3.

Elastic membranes 21, 22 are each on the Versdhließkörper 4 and the shut-off areas 5, 6 connected gas-tight, ζ. B. vulcanized, and their elasticity enables the spreading movement to press the shut-off surfaces 5, 6 against the sealing surfaces 19, 20 in the closed position 23

Ball bearings 24 on the closure body 4, together with recesses 25 in the valve housing 1, form a guide device for the closure body 4 for its displacement into the open position 26 (shown in dashed lines).

In Figs. La and b, the positions correspond to:

A - the open position 26 of the closure body 4; B - the locking position 23 of the locking body 4;

C - the maximum displacement position of the displacement ram 8 in the closure body 4, that is to say that shown in dashed lines in FIG. 1a expanded state in which the shut-off surfaces 5, 6 evenly to the sealing surfaces 19, 20 are pressed and sealed (in the closed position 23).

It is possible that the degree of expansion caused by the action of the displacement stamp on the hollow body Limit shut-off areas against the connecting openings by moving the displacement ram in the desired maximum position comes to rest against a stop and thereby

- 13 -

is prevented from further displacement; this measure is important insofar as, on the one hand, the shut-off areas 5, 6 only on the sealing surfaces (seals) 19, 20 and not on the border of the connection opening 2, 3 should be applied and on the other hand with extremely strong splaying of the shut-off surfaces 5, 6, the counterpressure caused by the mostly elastic seals 19, 20 under certain circumstances can rise to such an extent that the fluid in the hollow body 7 at the sealing points that are necessarily present begins to lick. As a stop for the displacement ram z. B. serve the screw plug 18; she can So at the same time as an adjustable stop for the displacement ram 8 use.

The mode of operation of the gate valve according to the invention also results in a general manner from the foregoing, In summary, it is important that:

- In the open position of the gate valve, the fluid in the hollow body is approximately the same Pressure or a lower pressure than its external pressure, so that the shut-off surfaces are in a non-spread position, i.e. as close as possible to the center of the hollow body, this position by a suitable one

the tensile stress device acting on the shut-off surfaces can be ensured in the hollow body.

The closing body is moved into the closed position by advancing the

- 14 -

with the displacement die in operative connection standing push rod driven in any way; in the closed position the closing body must be prevented from further displacement by an end stop

be.

A further advance of the push rod now causes the fluid in the hollow body to be displaced in the area in which the Ver

urge stamp acts; the resulting internal pressure in the hollow body is now sufficient, the forces of the tension device or equivalent means as well as the external pressure overcome so that - following the repression -

the shut-off surfaces of the hollow body moved outwards, d. H. towards and against Connection openings are spread. In the maximum displacement position of the displacement stem is thus the highest tightness

of the gate valve achieved. - Surprisingly, the tightness remains even if even to a lesser extent-preserved when the pressure on the push rod from any Reasons subsides; this means an increase

of system security.

As soon as to open the gate valve the push rod is withdrawn, the displacement stamp is relieved and also withdrawn,

- 15 -

3H6270

so that - following the resulting reduction in the internal pressure in the hollow body - the shut-off surfaces move away from the connection openings. With further retraction of the push rod and of the displacement temperature coupled with it

the hollow body of the movement of the push rod so that it is moved into the open position.

Depending on the application, the closure body will be through let a spring or the like automatically retract into the open position, preferably if the displacement ram and the push rod are only in operative connection in the pressure sense or in the event that the Actuating device fails, the open position is automatically assumed. Conversely, one becomes either one Compression spring or the like on the side of the actuating device or a tension spring or the like on the on the opposite side to act on the hollow body when the closed position in the event of failure of the actuating device to be taken or to remain; here is a pressure- and tensile-resistant connection between the push rod and Displacement stamp necessary.

Furthermore, a compression or tension spring can act on the displacement ram in such a way that if the actuating device fails, the degree of displacement in the hollow body is reduced so that the shut-off surfaces move away from the connecting openings and the gate valve can thus open automatically.
30th

Finally, the push rod or the displacement

- 16 -

Stamp also act a locking mechanism in such a way that at maximum expansion in the closed position Push rod or the displacement ram by snapping into place is recorded, so that the maximum tightness of the gate valve even if the actuating device fails preserved; to open must then by appropriate train or pressure of the actuating device on the push rod or the displacement ram of the locking mechanism are disengaged, so that the pressure relief in the hollow body and its subsequent shifting into the open position can take place.

In Fig. 2 the hollow body 7 has only a single, the connecting opening 2 dominant, shut-off area 5 on; a so-called angle valve can also be implemented in this way be, in which the connection opening 3 in any Angle to the connection opening 2, for. B. at right angles, can be arranged. In addition, it can be seen that the actuating device 10 is integrated into the valve housing 1. The push rod 11 and the displacement ram 8 form a single part. The guide flange 9 has Seals 27 opposite the displacement ram 8. A compression spring 28 in the hollow body 7 loads on the displacement ram 8 and, if the actuating mechanism fails, Direction 10 relieves pressure in the hollow body and enables the shut-off area 5 to be automatically moved away from the connection opening 2, which by a tensile stress device 29 (e.g. a tension spring) are supported between the closing body 4 and the shut-off surface 5 can. An automatic opening or closing of the lock

- 17 -

3H6270

closing body by moving can by means of a Zugbzw. Pressure device 30 are made possible, which engages on the side of the actuating device 10 on the hollow body 7 (the automatic closing can also take place via a tension spring, not shown in FIG. 2, at the opposite end). A latching mechanism 31 acts when maximum tightness is to be guaranteed in the closed position, even when the actuating device 10 is selected - with a latching part 32 on a corresponding counter-latching device 33, e.g. B. a notch in the push rod 11, on the displacement ram in the retaining direction. A spring 34 can secure the locking position. The disengagement can take place by strong pull or pressure with subsequent pull on the push rod, but also via an operating element 35, independently of the actuating device. Accordingly, if the actuating device 10 fails, the tight locking position can be maintained by the locking mechanism 31 and the gate valve can be opened automatically by means of the tensioning device 29 and a pulling device 30 when the locking mechanism is triggered manually. - If (as shown in Fig. 2) on the side opposite the shut-off surface on the hollow body 7 no further expandable surface is provided, counter-bearings 36 on the valve housing T designed as slideways are recommended.

Claims (13)

3H6270 BERGWERKSVERBAND GMBH EXPERIMENTAL COMPANIES OF MINING RESEARCH 4300 Essen 13 (Kray) Franz-Fijcher-Weg 61 Telephone (0201) 105-1 Gate valve Claims { 1.jA shut-off valve for opening and closing connection openings (2, 3) between two rooms (2a, 3a) consist of a) a valve housing (1) with two connection openings (2, 3), b) a closure body (4) with laterally, at least against one of the connecting openings (2, 3) / expandable shut-off area (s) (5, 6), c) an actuating device (10) with a push rod (11) for moving the closure body (4) into and out of the closed position (23) and to expand the shut-off surface (s) (5, 6) against the connection opening (s) (2, 3) and d) an end stop (16) for the closing body (4) in the desired closed position, characterized in that - ^: - - ■ · ■ - '--- 3U6270 e) the closing body (4) and the shut-off area (η) (5, 6) form a fluid-filled hollow body (7) and f) on the hollow body (7) for pressurization a • in operative connection with the actuating device (10) standing displacement ram (8) is arranged. 2. Abpserrschieber according to claim 1, characterized in that the displacement ram (8) engages through the wall of the closure body (4) (hollow body wall) in a sealed manner. 3. Gate valve according to claim 1 or 2, characterized in that the displacement ram (8) and the push rod (11) of the actuating device (10) are connected in a tensile and pressure-resistant manner. 4. Gate valve according to one or more of claims 1 to 3, characterized by elastic membranes (21, 22) between the closure body (4) and the (the) shut-off surface (s) (5, 6). 5. Gate valve according to one or more of claims 1 to 4, characterized by at least one on the shut-off surface (s) (5, 6) acting tensile stress device (29) in the hollow body (7). 6. Gate valve according to one or more of claims 1 to 5, characterized in that the end stop (26) is adjustable. 7. Shut-off valve according to one or more of claims 1 to 6, characterized by a known guide device (24, 25) of the closure body (4) for its displacement. 8. Gate valve according to one or more of claims 1 to 7, characterized by a fluid-operated actuating device (10). 9. Gate valve according to one or more of the claims 1 to 8, characterized in that the actuating device (10) and the valve housing (1) are connected in a sealing manner. 10. Gate valve according to one or more of the claims 1 to 9, characterized by an inspection flap (17) in the valve housing (1). 11. Gate valve according to one or more of the claims 1 to 10, characterized by a pulling or pushing device (28) acting on the displacement ram (8) for automatic pressure relief in the hollow body (7). 12. Gate valve according to one or more of claims 1 to 11, characterized by a pulling or pushing device (30) acting on the hollow body (7) for its automatic displacement. 13. Gate valve according to one or more of claims 1 to 12 / characterized by a latching mechanism (31) acting in the expanded closed position on the displacement ram (8).