DE19755472A1 - Two-stage gas pressure regulation device - Google Patents

Abstract

The instrument includes a safety stop valve (1), and a first and second regulation stage, which are connected through an overflow valve (2). The overflow valve comprises an adjustment element (19) having a first and second chamber (42, 43), and a first and a second valve seat (21, 22) in contact with respectively an output pressure (Pa), and an intermediate pressure (Pz). The adjustment element is alternatively axial movable, hermetically sealing the valve seats. The instrument includes a safety stop valve (1), and a first and second regulation stage, which are connected through an overflow valve (2). The overflow valve comprises an adjustment element (19) having a first and second chamber (42, 43), and a first and a second valve seat (21, 22) in contact with respectively an output pressure (Pa), and an intermediate pressure (Pz). The adjustment element is alternatively axial movable, hermetically sealing the valve seats. An aperture is provided between the chambers, which is connected with a channel (23) leading to a measuring membrane (9) of the safety stop valve.

Description

The invention relates to a two-stage gas pressure control device with a safety shut-off valve ( 1 ) comprising a measuring diaphragm, setpoint spring and a setpoint adjuster, which is arranged on or in a housing ( 3 ) accommodating two separate control stages (I; II) as an independent assembly of the first control stage , the two control stages (I; II) each containing actuators ( 4 ; 12 ), safety membranes ( 5 ; 13 ), measuring membranes ( 6 ; 14 ), setpoint springs ( 7 ; 15 ) and setpoint adjuster ( 16 ), one optionally on the actuator ( 12 ) of the second control stage arranged gas deficiency protection ( 17 ) and an overflow valve ( 2 ) in communication with the space of the first control stage and the space of the second control stage, which is accommodated by a housing ( 18 ) which enters the gas outlet of the first control stage (I) is used pressure-tight.

For the gas supply of apartments or residential buildings known gas pressure regulators used, the two Pressure control stages and a safety shut-off valve included. In the first control stage, the inlet pressure of the gas is raised one of inlet pressure fluctuations and flow changes largely independent intermediate pressure regulated. In the second control stage, the intermediate pressure is reduced to one regulated constant outlet pressure with which the following Gas application devices are operated.

The safety shut-off valve monitors the size of the Outlet pressure and interrupts the gas supply as soon as one certain limit is exceeded.

Accordingly, two-stage gas pressure regulators with one Housing known that a gas inlet to an inlet chamber, a Intermediate chamber and an outlet chamber with a gas outlet exhibits (see brochure Schlumberger Rombach, SER 10-10 / 96; Gas pressure regulator, type series RMV, two-stage compact Control device; SRB medium pressure compact control unit MKR, 04/96; DE 195 41 051 A1). These known controllers also have a Pre-control valve, which has a pre-valve body with a has assigned actuator and a valve seat, that of an opening in a partition between the inlet chamber and is assigned to the intermediate chamber. Furthermore, a Main control valve provided which has a main valve body an associated main actuator and a main valve seat has an opening in a partition between the Intermediate chamber and the outlet chamber is assigned.

The housing houses a safety shut-off valve, the one Safety actuator is assigned.  

The safety shut-off valves close in the event of malfunctions in the second control level. In the event of malfunctions in the first Control stage closes the control actuator of the second control stage, if the permissible size of the intermediate pressure is exceeded.

These known gas pressure regulators have the disadvantage that Malfunctions of the first control level u. U. only after Years of operation become apparent when the second level of control no longer adequately maintains the outlet pressure and that Control actuator of the second control stage shut-off function must take over.

The safety claim of such gas pressure regulators is better met, however, if the safety shut-off valve the size of the outlet pressure and that of the intermediate pressure separately monitored, d. H. already in the event of faults in the first Control stage the gas supply is interrupted, so not over long periods of safety-related states delayed become.

Another well-known two-stage gas Pressure regulator (brochure gas pressure regulator, type GRDA, 1981) to correspond to the fact that in the event of impermissibly high pressure in the first overflow or relief valve provided is and at an impermissibly high intermediate pressure Quick release device that triggers the gas supply locks.

The well-known gas pressure regulator (RMG-GASELAN, Type 342) corresponds to this safety aspect in that that an overflow valve is arranged in the first control stage, the gas into the space of the Output pressure can flow out. This will make it Safety shut-off valve triggered and the Gas supply interrupted.  

This known gas pressure regulator contains two separately working control stages, which are housed in a housing, on which the safety shut-off valve as an independent assembly is arranged. The control levels essentially comprise each an actuator, a safety membrane, a measuring membrane, a Setpoint spring and a setpoint adjuster.

This is already mentioned in the gas outlet of the first control stage Pressure relief valve used.

The safety shut-off valve is in this known solution a module that is not part of the control or throttling process of the Gas in the normal operating sequence of the gas pressure regulator is involved. The safety shut-off valve is therefore included most likely will not become inoperable. However, it is assumed that of three in the gas pressure regulator contained functional units (first and second control level, Safety shut-off valve) two may be defective at the same time, a functional unit still breakthrough the inlet pressure to the outlet pressure prevented, one must also assume that the Safety shut-off valve could fail.

In this prior art, the object of the invention based on such a device of the type mentioned improve that under all operating conditions there is no gas the first control level bypassing the second control level in can reach the space of the initial pressure and at the same time that Safety shut-off valve if the size of the Output and intermediate pressure interrupts the gas supply and in the event of failure of all three functional units by an additional one Shut-off device the gas supply is interrupted.  

This object is achieved in that

• a) the overflow valve is an actuator carrying sealing strips has a first space, one with the outlet pressure in Connected valve seat, a second room and with the valve seat in the housing related to the intermediate pressure are assigned, between which the actuator is axially movable, alternatively, the seats are contained in a gas-tight manner and that presses against that valve seat with a compression spring, which is charged with the intermediate pressure, and that the Actuator an opening between the first and second room is assigned, with a channel to the measuring membrane the safety shut-off valve is connected in a gas-carrying manner, or that
• b) the overflow valve in an additional shut-off device is integrated, the one the actuator of the overflow valve assigned piston-shaped valve plate, the axial movable and intermediate pressure tight the actuator of the second Control stage opposite in a housing bore is arranged under pressure spring and in a central Recess an actuator of the sealing strips Overflow valve perpendicular to the axis of the actuator second control stage, the actuator between one fixed in the housing, arranged coaxially to the actuator axis, with the intermediate pressure valve seat and an am Valve plate molded, with the outlet pressure actable valve seat is axially movable in the recess, alternatively, the seats are arranged in a gas-tight manner and that presses against that valve seat with a compression spring, which is charged with the intermediate pressure, and that the Housing bore through the second valve seat through a channel with the room of the first control level  pressurized and with a to the measuring membrane of the Safety shut-off valve leading channel connected gas-carrying is, with the actuator a passage and the Valve disc one at an impermissibly high intermediate pressure appealing lock is assigned.

According to a further feature of the device according to the invention pushes the piston-shaped valve plate in the closed state, d. H. if the intermediate pressure is impermissibly high, the actuator of the second Control stage with its sealing strip on the actuator assigned valve seat in the housing.

However, the valve plate can also be on the second one Provide a side knife on the side facing the control level be the actuator of the second control stage radially and axially engages and is assigned to one of the cutting edges, in Housing arranged sealing strip sealing in the closed state supports.

In a further preferred embodiment of the gas The pressure regulator is the first and second room connecting passage opening arranged in the actuator or the connection is made by one in the housing wall trending channel.

In the event that the overflow valve without additional Shut-off devices are preferred Embodiment of the device according to the invention as valve seats Seat bores provided by the outlet pressure acted valve seat has a diameter that is the same or is larger than the diameter of the seat bore of the through the intermediate pressure of the valve seat. The The passage opening has a diameter that is smaller than the diameter of the seat bore with the intermediate pressure acted valve seat.  

Another advantageous embodiment of the invention Device provides that a in the overflow valve housing to the actuator of the overflow valve arranged centrally Recording for the compression spring, which is the Actuator pushes against the valve seat that is pressurized.

The overflow valve is in an additional shut-off device integrated, so is the piston-shaped valve disc with a central inner receptacle into which a compression spring is used coaxially to the valve seat, which is opposite to that in the Housing bore inserted compression spring of the valve plate acts. According to a further preferred embodiment of the device according to the invention is in a perpendicular to Actuator axis of the second control stage introduced in the housing Recess arranged the lock, one by one Compression spring loaded ball.

Moves in the event of a further impermissibly high increase in the intermediate pressure the valve plate towards the actuator of the second Control stage, presses the valve disc against the actuator, whereby the actuator of the second control stage is forced is closed. The lock is free and holds the Valve disc in its closed position.

The actuator of the overflow valve and the sealing strips consist in a further preferred embodiment of the invention gas-resistant plastic, preferably an elastomer.

Of course it is also possible to use the actuator and the Sealing strips of the overflow valve in one piece made of gas-resistant Train plastic.  

The invention ensures that the safety shut-off valve with an impermissible size of the initial or intermediate pressure the gas supply is interrupted. If there is a defect, the Response or intermediate pressures directly to the Safety shut-off valve guided, causing the gas volume flow is cordoned off.

The additional shut-off device according to the invention prevents Failure of all three functional units in the invention Gas pressure regulator the drop in the inlet pressure in the Outlet pressure chamber.

The gas pressure regulator according to the invention is easy to use and compact design. It will be highest Security requirements even with long operating times.

Further advantages and details emerge from the following description with reference to the accompanying Drawings.

The invention is based on several exemplary embodiments are explained in more detail.

Show it:

Fig. 1 is a schematic representation of the functional units of the gas pressure regulating device according to the invention,

Fig. 2 is a sectional view of the first control stage and the Sicherheitsabsperrventiles,

Fig. 3 is a sectional view of the first and second control stage,

Fig. 4 is a sectional view through the inventive overflow valve,

Fig. 5 shows the integration of the overflow valve in a piston-shaped shut-off device and

Fig. 6 shows a further embodiment of the overflow valve and shut-off device.

example 1

According to Fig. 1 gas passes to the input pressure p _e about the safety shut-1 to the first control stage I, where it is controlled to the intermediate pressure p _z. In the second control stage II, the intermediate pressure p _{z is} regulated to the constant outlet pressure p _a . The overflow valve 2 is connected on the one hand to the rooms of the first and second control stages I and II, where the intermediate pressure p _z and the outlet pressure p _{a is} present, and on the other hand to the measuring chamber of the safety shut-off valve 1 .

The two control stages I and II are located in a housing 3 to which the safety shut-off valve 1 is flanged. As shown in FIG. 2, the first control stage I essentially consists of an actuator 4 , a safety membrane 5 , a measuring membrane 6 and a setpoint spring 7 . The safety shut-off valve 1 flanged to the housing 3 likewise comprises an actuator 8 , which is connected to the actuator 4 of the control stage I, a measuring diaphragm 9 , a setpoint spring 10 and a setpoint adjuster 11 .

Control stage II is accordingly composed of an actuator 12 , a safety membrane 13 , a measuring membrane 14 , a setpoint spring 15 and a setpoint adjuster 16 (see FIG. 3).

A gas shortage protection device 17 is also arranged on the actuator 12 .

Control stages I and II are separated by an overflow valve 2 used in the gas outlet of the first control stage I.

In FIG. 4 the spill valve 2 is shown having a housing 18 in which an actuator 19 and a compression spring up containing 20. The housing 18 also has a valve seat 21 which is connected to the outlet pressure p _a and a valve seat 22 which is connected to the intermediate pressure p _z . A space 42 is assigned to the valve seat 21 and a space 43 is assigned to the valve seat 22 . In this example, both spaces are connected to one another through the passage opening F in the actuator 19 .

In addition, the housing 18 is connected to the measuring chamber of the safety shut-off valve 1 through a channel 23 in a gas-discharging manner. The actuator 19 carries the sealing strips 24 and 25 . The compression spring 20 presses the actuator 19 , which is axially movable between the valve seats 21 and 22, gas-tightly against the valve seat 22 .

This position of the actuator 19 ensures over the free cross section of the valve seat 21 that the outlet pressure p _{a is present} via the channel 23 in the measuring chamber of the safety shut-off valve 1 and the outlet pressure p _{a of} the second control stage II is monitored by the safety shut-off valve 1 .

If the intermediate pressure p _{z of} the first control stage I rises to a pressure which leads to leakage at the valve seat 22 , a force is generated with the surface of the actuator 19 with the diameter E which causes the valve seat 21 to close suddenly. The connection to the room in which the outlet pressure p _a prevails is shut off in a gas-tight manner. At the same time, from the free cross-section of the valve seat 22 and via the passage opening F in the actuator 19, the impermissible intermediate pressure p _z passes via the channel 23 to the measuring chamber of the safety shut-off valve 1 , which shuts off the gas flow.

Example 2

The overflow valve 2 shown in FIG. 4 is integrated according to FIG. 5 in a piston-shaped valve plate 26 , which is axially movable and pressure-tight in a housing bore 27 . The housing bore 27 is connected via the valve seat 22 to the space of the first control stage I by a gas-carrying channel 28 and has a connection to the measuring chamber of the safety shut-off valve 1 via the channel 23 . The valve seat 22 is fixed in alignment with the actuator axis A of the second control stage II in the channel 28 . The housing bore 27 has a groove-shaped recess 29 in its area facing the valve seat 22 , into which a compression spring 30 is inserted. This compression spring 30 presses the piston-shaped valve plate 26 into its respective working position.

In the piston-shaped valve plate 26 , a central recess 31 is made in alignment with the actuator axis A, which receives the actuator 19 perpendicular to the actuator axis A of the second control stage II. The recess 31 ends in a further recess 32 for the compression spring 20 , which acts counter to the compression spring 30 .

The piston-shaped valve plate 26 is sealed in the housing bore 27 by additional sealing strips 33 . Perpendicular to the actuator axis A, there is a recess 34 in the housing for a lock 35 , which in this example consists of a ball 37 loaded with a compression spring 36 .

The actuator 12 of the second control stage II carries a valve plate 38 , which is associated with a valve seat 39 which is formed on the housing wall of the housing and which is located in the space to which the outlet pressure p _{a is} applied.

If the intermediate pressure p _{z is} inadmissibly high, the overflow valve 2 operates as described in Example 1, so that the intermediate pressure p _z reaches the measuring chamber of the safety shut-off valve 1 via the channel 23 and the gas flow is interrupted. If the already inadmissibly high intermediate pressure p _z continues to rise, the piston-shaped valve plate 26 presses on the valve plate 38 after the lock 35 has been released , as a result of which the actuator 12 of the second control stage II is forcibly closed.

Example 3

In contrast to example 2, according to FIG. 6 the valve plate 26 is provided with a seat cutter 40 which is pressed against a sealing strip 41 when the inadmissibly high intermediate pressure acts on the valve plate 26 .

Reference list

1

Safety shut-off valve

2nd

Overflow valve

3rd

Housing of the gas pressure regulator

4th

Actuator of the first control level I

5

Level I safety membrane

6

Measuring membrane of control level I

7

Setpoint spring from control stage I

8th

Actuator of

1

9

Measuring membrane from

1

10th

Setpoint spring from

1

11

Setpoint adjuster from

1

12th

Second stage II actuator

13

Safety membrane of regulation level II

14

Measuring membrane of control level II

15

Setpoint spring from control stage II

16

Setpoint adjuster from control level II

17th

Low gas security

18th

Overflow valve housing

2nd

19th

Actuator of

2nd

20th

Compression spring from

2nd

21

Valve seat from

2nd

22

Valve seat from

2nd

23

channel

24th

,

25th

Sealing strips

26

piston-shaped valve disc

27

Housing bore

28

gas-carrying duct

29

groove-shaped depression

30th

Compression spring for

26

31

Recess for actuator

19th

in

26

32

Recess for compression spring

20th

in

26

33

Sealing strips

34

Recess for locking

35

Interlock

36

Compression spring from

35

37

Ball of

35

38

Valve plate from actuator

12th

39

Valve seat from

38

40

Cutting edge

41

Sealing strip for

40

42

the sealing strip

25th

allocated space

43

the sealing strip

24th

allocated space

44

Sealing strip
p _e

Inlet pressure
p _z

Intermediate pressure
p _a

Outlet pressure
First control level
II second control level
E diameter of the actuator

19th

F Passage opening in the actuator

19th

D diameter of the seat bore, which with p _a

is acted upon
dThe diameter of the seat bore, which with p _z

is acted upon

Claims (11)

1. Two-stage gas pressure regulating device with a safety shut-off valve ( 1 ) comprising a measuring diaphragm, setpoint spring and a setpoint adjuster, which is arranged on or in a housing ( 3 ) accommodating two separate control stages (I; II) as an independent assembly of the first control stage, whereby the two control stages (I; II) each contain actuators ( 4 ; 12 ), safety membranes ( 5 ; 13 ), measuring membranes ( 6 ; 14 ), setpoint springs ( 7 ; 15 ) and setpoint adjuster ( 16 ), one optionally on the actuator ( 12 ) the second control stage arranged gas deficiency protection ( 17 ) and an overflow valve ( 2 ) in communication with the room of the first control stage and the room of the second control stage, which is accommodated by a housing ( 18 ) which is in the gas outlet of the first control stage (I ) is used pressure-tight, characterized in that

• a) the overflow valve ( 2 ) has a sealing strip ( 24 ; 25 ) carrying actuator ( 19 ), which has a space ( 43 ), a valve seat ( 21 ) connected to the outlet pressure (p _a ), a space ( 42 ) and a valve seat ( 22 ) in connection with the intermediate pressure (p _z ) in the housing ( 18 ) is allocated, between which the actuator ( 19 ) is contained in an axially movable manner, alternatively sealing the valve seats in a gas-tight manner and by means of a compression spring ( 20 ) against the valve seat presses, which is subjected to the intermediate pressure (p _z ), and that the actuator ( 19 ) is assigned a passage opening (F) between the spaces ( 42 ; 43 ), which has a channel ( 23 ) to the measuring membrane ( 9 ) of the safety shut-off valve (I) is connected in a gas-carrying manner, or that
• b) the overflow valve ( 2 ) is integrated in an additional shut-off element which has a piston-shaped valve plate ( 26 ) which is assigned to the control element ( 19 ) of the overflow valve and which is axially movable and is pressure-tight relative to the control element ( 12 ) of the second control stage (II) in one Housing bore ( 27 ) is arranged pressurized by spring and accommodates the actuator ( 19 ) carrying a sealing strip in a central recess ( 31 ) perpendicular to the axis (A) of the actuator ( 12 ) of the second control stage, the actuator being fixed between one in the housing ( 3 ) , used coaxially to the actuator axis (A), with the intermediate pressure can be acted upon valve seat ( 22 ) and a valve seat ( 26 ) molded, with the outlet pressure acted on valve seat ( 21 ) axially movable in the recess ( 31 ), the seats are alternatively arranged gas-tight and that presses against the valve seat by a compression spring ( 20 ) that m it is acted upon by the intermediate pressure (p _z ), and that the housing bore ( 27 ) acts via the valve seat ( 22 ) through a channel ( 28 ) with the space of the first control stage intermediate pressure and is connected in a gas-conducting manner to a channel ( 23 ) leading to the measuring diaphragm of the safety shut-off valve The control element ( 19 ) is assigned a passage opening (F) and the valve plate ( 26 ) is assigned a lock ( 35 ) which responds to an impermissibly high intermediate pressure.

2. Gas pressure regulator according to claim 1, characterized in that the valve plate ( 26 ) in the closed state holds the actuator ( 12 ) of the second control stage with its sealing strip ( 44 ) on a valve seat ( 39 ) sealingly. 3. Gas pressure control device according to claim 1, characterized in that the valve plate ( 26 ) on its side facing the second control stage is provided with a cutting edge ( 40 ) which overlaps the actuator ( 12 ) of the second control stage radially and axially and on supports a sealing strip ( 41 ) assigned to the seat edge and arranged in the housing in a sealing manner in the closed state. 4. Gas pressure regulator according to claim 1, characterized in that the spaces ( 42 ; 43 ) connecting passage opening (F) passes through the actuator ( 19 ) or is a channel running in the housing wall. 5. Gas pressure regulator according to claim 1, characterized in that seat bores are provided as valve seats ( 21 ; 22 ), the valve seat ( 21 ) acted upon by the outlet pressure has a diameter (D) which is equal to or greater than the diameter ( d) the seat bore of the valve seat ( 22 ) acted upon by the intermediate pressure and that the passage opening (F) has a diameter which is smaller than the diameter (d). 6. Gas pressure control device claim 1, characterized in that in the housing ( 18 ) of the overflow valve ( 2 ) a centrally arranged to the actuator towards the receptacle ( 32 ) for the compression spring ( 20 ) is provided. 7. Gas pressure regulator according to claim 1, characterized in that in the valve plate ( 26 ) a receptacle ( 32 ) for the compression spring ( 20 ) is arranged, the axis of which coincides with the actuator axis (A) of the second control stage. 8. Gas pressure regulator according to claim 1, characterized in that the actuator of the overflow valve ( 2 ) consists of gas-resistant plastic, preferably elastomer. 9. Gas pressure regulator according to claim 1, characterized in that the sealing strips ( 24 ; 25 ) made of gas-resistant plastic, preferably elastomer. 10. Gas pressure regulator according to claim 8 and 9, characterized in that the actuator ( 19 ) and the sealing strips ( 24 ; 25 ) are integrally formed. 11. Gas pressure control device according to claim 1, characterized in that the lock ( 35 ) is arranged in a recess ( 34 ) introduced perpendicularly to the actuator axis of the second control stage in the housing and consists of a ball ( 37 ) acted upon by a compression spring.