DE3123028A1 - Diaphragm valve - Google Patents

Abstract

Diaphragm valve with a valve housing, a cap and a diaphragm which is secured at its circumference on the valve housing and/or on the cap and is connected in the centre to the thrust piece, characterised in that that area of the diaphragm which is directly exposed to the pressure "P" of the liquid is supported over its entire area against the pressure of the liquid in the open position.

Description

The invention relates to diaphragm valves which have a valve housing, a hood and a diaphragm include, with their peripheral area on the valve housing and / or attached to the hood and connected with its central area to the pressure piece is.

Such valves are from the German Offenlegungsschriften 23 07 580, 24 55 239 and 26 07 283 known. What all these known diaphragm valves have in common is that a transition area of the membrane between its edge area and that connected to the pressure piece middle area is constantly loaded and deformed by the fluid pressure. This due to The deformation that occurs due to the constant pressure causes embrittlement and fatigue of the material Diaphragm section and ultimately leads to the breakage of the same, which is a very large number of examples in practice have proven.

The object of the invention is to create a valve which is particularly reliable and in particular the risk of diaphragm rupture is reduced to a minimum.

This object is achieved by the features of claim 1.

Due to the fact that according to the invention

the entire surface area of the membrane, which is exposed to the fluid pressure, is the core problem of all diaphragm valves, namely the deflection of the membrane due to the liquid pressure, completely eliminated. As well in In the closed position as well as in the open position of this valve according to the invention, bending of the membrane is prevented Valve is only used in the open position or in the closed position, is one Embrittlement and fatigue of the membrane material due to the pressure of the liquid are excluded. The valve according to the invention is therefore completely reliable in operation over particularly long periods of time.

If the diaphragm breaks in a diaphragm valve, the medium can reach the outside via the hood. There are thereby drawn not only the operating parts of the valve affected _s but, what is much more serious, it can, depending on the agents at that high damage of instruments and buildings arise.

Another object of the invention is to provide a diaphragm valve to create, which prevents the disadvantages mentioned even if the membrane breaks.

This object is achieved according to a development of the invention in that the membrane both in the closed position as well as in the open position between pressure piece areas on the one hand and valve housing or hood sections on the other hand

chert and tightly clamped.

According to this development of the invention, circumferential areas of the membrane act both in the Open position as well as in the closed position as a seal between liquid-impermeable Structural parts of the valve. This ensures that there is no liquid even if the diaphragm ruptures can escape to the outside through the hood of the valve, not even in the open position of the valve. The latter advantage in particular is of great importance, since many work processes are not may be interrupted.

Another advantage of the invention is that even with a broken membrane, if necessary the valve can even be actuated several times, with only during the transition off the closed position to the open position or vice versa by small amounts of the liquid the hood can exit upwards. In the event of a diaphragm rupture, its probability is very low anyway due to the construction according to the invention, the ongoing operation be maintained until it is completed or until it is interrupted is possible without major cost disadvantages, even if the continuation of the operation Valve still has to be actuated several times.

Another advantage of the development of the invention is that due to the train-secured and

sealing clamping of the membrane, this is only subjected to bridging loads by the liquid can be. Any tensile load on the membrane is excluded due to the clamping described.

The valve according to the invention is thus not only particularly reliable in operation, but also allows · = can also be used at higher pressures.

Appropriately, starting from the circumferential area of the membrane both in the direction of the passage as well as circumferential contact surfaces for the membrane in the direction of the hood. These The embodiment of the invention ensures that there is no gap starting from the edge area of the membrane © Support of the membrane up to the edge area of these contact surfaces.

The surface area covered by the membrane of the pressure piece is expediently larger than the passage area. Due to this form of training, the edge area of the pressure piece presses the Membrane against the inner edge area of the annular contact surface, which is from the edge area of the membrane is formed starting towards the through opening.

The seat shape of the pressure block can be spherical. Appropriately, the Pressure body in the area of the valve housing seat and the valve housing seat have the same geometric shape Shape on.

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The membrane can be permanently vulcanized onto the hemispherical section of the pressure piece. These Further development of the invention ensures a particularly secure guidance and seal between the pressure piece and the valve housing seat.

Starting from its hemispherical section, the pressure body can merge into a section, which with the same inclination as the inner one directed from the edge area of the membrane towards the passage Contact surface area.

This development of the invention ensures a particularly good sealing between the edge region _there d thrust piece and the contact surface area.

According to another development of the invention, the pressure body has a protruding, for Ring section directed towards the hood, which in the open position against a formed in the hood, is pressed to the passage facing sealing ring section. This embodiment of the invention supports the sealing effect between the pressure piece and the hood in the open position of the valve.

The sealing ring section or contact surface area facing the passage can be integral with the hood housing wall be formed.

The diaphragm can encompass a peripheral edge of the pressure body, on whose sealing ring

cut have adjacent web. This development of the invention also serves to support a particularly good sealing effect between the pressure body and the hood.
. The entire area between the circumferential area of the membrane and the sealing ring section of the hood is expediently designed as a contact surface for the membrane in its open position. This embodiment provides a smooth and seamless support for the membrane from its peripheral area to the sealing ring section of the hood.

The web of the membrane can have an additional annular bead. This works together with the valve cover a tight seal, even with a broken membrane.

Appropriately, this annular bead can also be designed as a damping in the opening direction »

The circumference of the membrane is after a Embodiment of the invention designed as a pinching bead. This pinching bead can be in recesses of the housing and the hood.

The transition area of the membrane between the printing block and the clamping bead is expedient designed to be elastic. It can be reinforced by deposits. This development of the invention has the advantage of adapting the valve to particularly high operating pressures. 30th

The clamping bead can be installed with a defined preload. This bias is prevents leakage in the event of temperature fluctuations.

The recesses can accommodate the solid volume to prevent compression of the Be formed and dimensioned rubber material.

The pressure block can be designed in one piece with the cast-on upper part for the actuating thread be, but it can also consist of two parts.

In the latter case, the printing block and upper part are expediently with a bayonet lock

connected with each other.
15th

On this occasion it is pointed out that that another great advantage of the invention is to be seen in the fact that the spindle is in the open position the actuation part is completely relieved. 20th

Another advantage can be seen in the fact that the hood rests in metal on the housing and prevents the diaphragm from tilting and squeezing.

Further advantages and features of the invention emerge from the subclaims in connection with Drawing and description. In the latter show:

Figure 1 shows a partial longitudinal section and partial cross-section through a valve

- 13 ~

Handwheel,

Figure 2 shows a cross section through a one-piece printing block with vulcanized Membrane,

Figure 3 is a plan view of the pressure piece

of Figure 2 in the direction of arrow A,

Figure 4 is a plan view of the pressure piece

of Figure 2 in the direction of arrow B,

FIG. 5 shows a cross section through a one-piece pressure piece with an actuating thread before gumming,

Figure 6 shows a cross section through a two-part pressure piece, its so-called The threaded bushing is connected to the part facing the flow opening with the aid of a bayonet lock is,

Figure 7 shows a cross section through a two-part. ges pressure piece, its threaded bushing with the section facing the flow opening via a screw connection connected is,

Figure 8 a partial longitudinal section and partial transverse

section through the valve of Figure 1 in the closed position,

FIG. 9 shows a partial longitudinal section and partial cross-section through the valve of the figure

1 in open position, and

Figure IO a partial longitudinal section and partial cross-section through the valve of Figure 1 with the membrane in the intermediate position.

FIG. 8 shows half a longitudinal and half a cross section rotated by 90 ° diaphragm valve according to the invention.

half a cross section rotated by 90 ° through a

The passage 2 of the valve housing 1 is, as can be seen in the left part of Figure 1, with the Membrane 3, which is partially on a pressure piece

4 is vulcanized. Form

of the pressure piece 4 and the membrane 3 is hemispherical in the area of the passage 2 and goes to one Sealing seat 5 out in a cone shape. This tight fit

5 is designed circumferentially and merges with the housing into a groove 7, which is also circumferential

.25 is designed and for holding the membrane 3 between the housing 1 and the valve cover 8 serves.

In the valve cover 8, a circumferential sealing ring 10 is formed, which faces the passage is. Against this sealing ring 10, as can be seen in the right-hand side of FIG.

position of the valve of the circumferential area of the pressure piece 4 is pressed. In this position, the pressure piece seals the valve towards the top and thus from the outside,
5

In order to keep the torsional forces away from the diaphragm during the actuation processes, the A rotation lock 11 is attached to the printing block. With a spindle 12, the valve is over a Handwheel operated in a known manner. Other operations, such as power pistons, electric drives, Diaphragm drives and the like can also be used within the scope of the invention.

The valve cover 8 is secured with the aid of bolts 23 connected to the valve housing 1.

FIG. 2 shows a one-piece pressure piece with a vulcanized or vulcanized membrane in sectional view.

The complete membrane 3 is partially on the printing block 4 with the molded anti-twist device 11 vulcanized. As can be seen particularly clearly in this FIG. 4, the edge region 4a is to the side above the cast-on threaded section 24 in which thread 25 is formed. To this one protruding section 4a engages a web 9 of the membrane 3. This web section 9 is in the closed position of the pressure piece between the above Circumferential area 4a and the sealing ring 10 formed on the valve cover 8.

In its position, this plug-in section 9 acts as a seal between pressure piece 4 and sealing ring 10.

The membrane has a clamping bead 7 and fixing markings 14 on its circumferential area. For secure sealing, the membrane 3 carries a circular bead 15 on the sealing section and on the Sealing seat a transverse bead 16. These two beads have a defined size, so certain Geometric shape and dimensions to keep the specific surface pressure during the closing process within limits to hold so that a good relationship between closing force and closing effect is achieved.

The web 9 described on the back of the membrane 3 is also vulcanized and this vulcanized "round section" 19 contributes to the perfect adhesion of the vulcanization.

The two fixations 14 have the function of ensuring correct assembly, thus the transverse bead 16 also correctly on the sealing ridge

20 of the housing 1 comes to rest. Corresponding pockets 21 are provided on the housing for the fixings and 22 cast. These recesses or annular gaps

21 on the housing 1 and 22 on the hood 8 are designed so that they screw on during assembly allow the hood 8 on the housing 1 with the screws 23, this by pressing together of the pinching bead 7 evasive volume added can be.

FIG. 3 shows a plan view of the pressure piece of FIG. 2 in the direction of arrow A. In this Figure you can see particularly well the anti-rotation device 11, which has a circular cross-section having diametrically opposed ribs.

FIG. 4 shows a view in the direction of arrow B onto the pressure piece 4 of FIG vulcanized membrane 3. In this figure 4 you can see the circular bead 15, the transverse bead 16, the annular bead 7 and the fixing markings particularly well 14th

FIG. 5 shows a cross section through a one-piece printing block 4 with a cast Upper part 24, which contains the actuating thread 25. Acting as a rotation lock 11 Guide rib and further ribs 26 serve to stiffen the pressure piece 4 and are also formed in one piece with this. The curvature 27 of the pressure piece 4 is hemispherical, in order to fit in exactly the complementary shape of the housing as a counterpart in the closed state.

FIG. 6 shows a section through a pressure piece consisting of several parts. The dem Passage 2 facing section 28 has cast ribs 29, in which the upper part 30, which a rotation lock 31 and an actuating thread 32 is used. The top 30 is connected to the pressure piece 28 by means of a bayonet lock.

3123023

FIG. 7 shows a cross section through a pressure piece 33, its associated upper part 34 has a molded anti-rotation device 35 and an actuating thread 36. The top 34 is fastened to the pressure piece 33 with fastening screws 37. The membrane is in turn in the same Form and attached and attached in the same way as in Figure 2.

FIG. 8 shows a combined longitudinal and cross section through the valve, with the sealing section is in the closed position. The pressure piece with the vulcanized membrane is through Actuation of the handwheel 13 by means of the spindle thread 25 of the spindle 12 firmly on the seat 20 and 5 of the housing 1 pressed until tightness is achieved. The sealing beads 15 and 16 cause the absolute tightness of the valve in the end. The membrane 3 on the pressure piece 4 is with the help of the The spindle force is pressed so strongly against the seat of the valve that the diaphragm is pushed through the Pressure "P" cannot be lifted. The supporting, i.e. the elastic, piece of the membrane 6 is thus fully supported in the closed state and lies outside the pressure piece 4 on the slope 5 of the housing. By clamping the membrane section between the Circumferential area 4a of the pressure piece 4 and the Sealing surface section 5 is also the section loaded in the intermediate position of the pressure piece (compare Figure 1) the membrane 3 completely

draft-free. In this closed position of the valve, there can be no expansion or bulging of the membrane enter. This means that there is no membrane fatigue possible through constant stretching. As seen in this Figure 8, the valve is in its closed position absolutely tight even when the elastic part of the membrane should be broken. This inevitably results from the fact that the free part in intermediate positions 6 of the membrane 3 lies above the sealing section 15, which is also in the closed state is without tensile stress.

FIG. 9 shows a combined longitudinal and cross section through the valve in its open position The pressure piece 4 is in this open position with the rear side of the peripheral area 4a pressed against the sealing ring 10 on the valve cover 8.

The ring-shaped one is in this position Web section 19 of the membrane 3 between the back of the peripheral area 4a and the Sealing ring 10. This web 9 acts as a seal between the pressure piece and the sealing ring 10 the valve cover 8. In order to improve the sealing effect, a bead 18 is on the web 9 of the Membrane 3 formed.

As can be seen in this figure, the elastic one is pressurized in intermediate positions Part along the membrane 3 without any tensile stress, through which membranes in general

be at risk, since it lies fully against the rear support 40.

It should also be noted that in this open position there is an increased liquid pressure "P" in no way entails the risk of the valve leaking. On the contrary, this increased fluid pressure "P" presses the pressure piece even more strongly against the sealing ring 10, so that the sealing effect is increased.

It should also be noted that in this position the spindle of the pressure piece is completely can be relieved.

The upwardly acting seal of the web 9 and bead 18 is a damping stop formed in the version with power piston actuation.

FIG. 10 shows a combined longitudinal and cross section through the valve in an intermediate position. Due to the inventive design of the valve is in intermediate positions from Resilient part 6 of the membrane 3 loaded with fluid pressure in relation to the diameter of the pressure piece made very small. For this reason, relatively high pressures from Intermediate piece 6 are received without this experiencing any significant deformation would. The tensile stress exerted by the fluid pressure is thus also in intermediate positions

with this valve is much better caught than with the known valves.

During the opening process, the membrane 3 lifts off the contact surface 5 of the housing and the operating pressure "P" can spread under the membrane. to At the beginning of the opening phase, the free part 6 of the membrane 3 receives its greatest load, that is to say the greatest stress on this ring cross-section on tension. In this part 6 the membrane is accordingly the expected loads from district deposits reinforced in order to easily withstand even the highest pressures.

The further the valve is opened, the more the load on the elastic membrane area 6 decreases, since this is increasingly at the incline Inner wall 40 of the hood 8 applies and supports. In the final phase of opening, the elastic area 6 completely on the inner wall 40, so that this area is only on Pressure is loaded. A tensile load no longer occurs in this fully open position a.

Claims (1)

20th 25th Expectations: Diaphragm valve, with a valve housing, a hood and a membrane, which is fastened with its peripheral area on the valve housing and / or on the hood and with its central area connected to the pressure piece (4), characterized in that the fluid pressure ¹¹ P ″ directly exposed area (6) of the membrane (3) in the open position is supported on its entire surface against the liquid pressure "P". 30th 2, valve according to claim 1, characterized in that the membrane (3) both in the closed position as well as in the open position between pressure piece areas (4a) on the one hand and valve housing CHECK ACCOUNT MUNICH 198858-807 SUMMERZBAMK MUNICH, ACCOUNT NUMBER 22 11 480 (5) or hood sections (10), on the other hand, is secured against tension and clamped in a sealing manner. 3. Valve according to one of claims 1 or 2, characterized in that starting from the circumferential area of the membrane (3) both in the direction for the passage as well as in the direction of the hood, circumferential contact surface (5, 40) for the membrane (3) are formed. 4. Valve according to one of claims 1 to 3, characterized in that the membrane (3) covered surface area of the pressure piece (4) is larger than the passage area (2). 5. Valve according to one of claims 1 to 4, characterized in that the pressure piece (4) is hemispherical in its seat shape and the same in the area of the valve housing seat has a geometric shape like this. 6. Valve according to one of claims 1 to 5, characterized in that the membrane (3) is firmly vulcanized onto the hemispherical section of the pressure piece (4). 7. Valve according to one of claims 1 to 6, characterized in that the pressure piece (4) from its hemispherical section into a section which passes over with the same inclination like the inner contact surface facing from the edge area of the diaphragm (3) towards the passage area (5) has. 8. Valve according to one of claims 1 to 7, characterized in that the pressure piece (4) has a protruding ring section (18) directed towards the hood (8), which in the open position against a sealing ring section (10) formed in the hood (8) and pointing towards the passage (2) is pressed.
10 9. Valve according to one of claims 1 to 8, characterized characterized in that the sealing ring section (10) facing the passage (2) is integral with the hood wall (8) is formed. 10. Valve according to one of claims 1 to 9, characterized in that the membrane (3) one around the peripheral edge (4a) of the pressure piece (4) on the sealing ring section has adjacent web (9). 11. Valve according to one of claims 1 to 10, characterized in that the entire surface between the circumferential area (7) of the membrane (3) and the sealing ring section (10) of the hood (8) as a contact surface (40) for the membrane (3) is designed in its open position, 12. Valve according to one of claims 10 or 11, characterized in that the web (9) has a has additional annular bead (18). -A- 13. Valve according to one of claims 10 to 12, characterized in that the annular bead (18) is designed as a damping in the opening direction. 14. Valve according to one of claims 1 to 13, characterized in that the transition to Sealing ring (10) of the valve cover (8) ensuring a tight contact with the diaphragm (3), Has bulge (42). 15. Valve according to one of Claims 1 to 14, thereby characterized in that the peripheral area of the membrane (3) is designed as a clamping bead (7). 16. Valve according to claim 15, characterized in that the clamping bead (7) in recesses (21, 22) of the housing (1) and the hood (8) is added. 17. Valve according to one of claims 1 to 16, characterized in that the transition region of the membrane (3) is designed to be elastic between the pressure piece (4) and the clamping bead (7). 18. Valve according to claim 17, characterized in that the transition region of the membrane (3) between Pressure piece (4) and clamping bead (7) is reinforced by inserts. 19 '. Valve according to one of Claims 15 to 18, characterized in that the clamping bead (7) is installed with a defined preload. 20. Valve according to one of claims 1 to 19, characterized in that the membrane (3) in the region of the
Pressure piece (4) on the side facing away from this with a circular bead (15) and with a transverse bead (16) is provided. 21. Valve according to one of claims 1 to 20, characterized in that the recesses (21, 22) designed to accommodate the compressed volume to prevent compression of the rubber material and
are dimensioned. 22. Valve according to one of claims 1 to 21, characterized in that the pressure piece (4) is integral with ¹ S the cast upper part (24) is formed with an actuating thread (25). 23. Valve according to claim 22, characterized in that
that the pressure piece (28) consists of two parts. 24. Valve according to claim 22 or 23, characterized
characterized in that the pressure piece (28) and the upper part (30) are connected to one another with a bayonet lock
are. 25. Valve according to one of claims 1 to 24, characterized in that a rotation lock (H)
and leadership is cast directly on. 26. Valve according to one of claims 1 to 25, characterized in that the hood (8) is metallic on the
Housing (1) rests and an inclined position and
The diaphragm (3) is prevented from being squeezed off.