GB2077885A - Governor for regulating and controlling gas pressure - Google Patents
Governor for regulating and controlling gas pressure Download PDFInfo
- Publication number
- GB2077885A GB2077885A GB8019944A GB8019944A GB2077885A GB 2077885 A GB2077885 A GB 2077885A GB 8019944 A GB8019944 A GB 8019944A GB 8019944 A GB8019944 A GB 8019944A GB 2077885 A GB2077885 A GB 2077885A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- diaphragm
- inlet
- pressure
- partition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
- G05D16/0655—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane
- G05D16/0658—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using one spring-loaded membrane characterised by the form of the obturator
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
- G05D16/0672—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using several spring-loaded membranes
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Fluid Pressure (AREA)
- Safety Valves (AREA)
Abstract
A gas pressure governor comprises a hollow body having an inlet 3 and an outlet 5 separated by a partition 4 mounting a port sleeve 6 having a valve seat in the form of an annular lip seal 10. A poppet valve has a head 9 and two opposed stems 12 and 15. A compensating diaphragm 13 is mounted on the stem 12 and a main diaphragm 16 is mounted on the stem 15. The main diaphragm 16 in conjunction with the partition 4 provides an outlet chamber 23, and the compensating diaphragm 13 with the port sleeve 6 and partition 4 provides an inlet chamber 26. A passageway 24 extends through the valve stems. A spring 20 which can be adjusted applies a force to the valve stem. In operation, the valve is subject to the spring force and is moved axially relative to the valve seat by the compensating diaphragm in response to inlet pressure variations upstream of the valve, and moved by the main diaphragm in response to variations in pressure downstream of the valve whereby the valve is closed on the seating when pressure on the main diaphragm exceeds the control force applied by the spring means. <IMAGE>
Description
SPECIFICATION
Governor for regulating and controlling gas pressure
This invention relates to gas pressure governors, particularly for reducing and controlling mains gas pressure supplies for domestic premises.
It is an object of this invention to provide a governor that is of simple design and economic to produce whilst achieving necessary pressure control under gas flow conditions arising in service.
It is another object of this invention to provide a governor which obviates build up downstream of the governor when there is no gas flow.
It is another object of this invention to provide a governor which provides a special valve arrangement ensuring stability of operation in service.
According to this invention we provide a gas pressure governor comprising a hollow body having an inlet and an outlet separated by a partition mounting a valve seat, a valve responsive to inlet pressure and having a head for cooperation with the seat to control flow through the outlet and having opposed stems extending axially from the valve head, one stem adjacent the inlet mounting a compensating diaphragm acting on the valve, and the other stem downstream of the valve seat mounting a main diaphragm, the valve being supported at opposed ends by said diaphragms for axial movement relative to the valve seat, and adjustable spring bias means acting on said valve providing a force for controlling actuation of the valve at required pressures, the arrangement being such that the valve is subject to the spring force and is moved axially relative to the valve seat by the compensating diaphragm in response to inlet pressure variations upstream of the valve and moved by the main diaphragm in response to variations in pressure downstream of the valve whereby the valve is closed on the seating when pressure on the main diaphragm exceeds the control force applied by the spring means.
By this invented governor we provide support for the valve through the diaphragms which are disposed at respective ends of each valve stem so that instability often arising in governors with poppet valves where a single stem of the valve is connected to one or more diaphragms is avoided.
Preferably, the valve head is of part-sphericai shape and the seat comprises a resilient lip seal mounted in an annular opening formed in the partition. The oppositely extending valve stems project respectively into inlet and outlet chamber which are separated in the body by the partition.
The inlet chamber may be defined by the partition and the compensating diaphragm so that changes in inlet pressure act on one face of the diaphragm with the other face of the diaphragm being subject to pressure in the outlet chamber through a passageway interconnecting the outlet chamber to a low pressure chamber in the body remote from the valve seat and closed by the compensating diaphragm. Such passageway may extend through the valve head and the opposed valve stems of the valve.
Preferably, the compensating diaphragm is mounted in the body by a port sleeve of which one end locates the peripheral edge of the compensating diaphragm in an annular recess in the body. The port sleeve may also be provided with an annular inwardly directed flange on which the lip seal is located by a clamping ring which is secured to the partition to hold the assembly of the port sleeve and seal and compensating diaphragm in position.
The body may be comprised of more than one part, and preferably comprises two main parts, one providing the inlet and outlets separated by the partition and the other providing a mounting for the spring bias means and for mounting the main diaphragm on the first part.
By such an arrangement, all of the essential parts of the governor contained within the hollow body are arranged co-axially and can be assembled in the main body part prior to fixing the cover part. Additionally, for servicing and maintenance, the valve and diaphragms are easily accessible on removal of the cover part. Other advantages in manufacture are also derived by providing the port sleeve because accurate machining can be confined to relatively small parts of the main body which would normally be a casting, and by design of suitable sealing between the port sleeve and the body, tolerances of manufacture and in assembly can be accommodated.
Furthermore, by providing the valve head which is intermediate the opposed stems, and the valve head cooperates with a seating that is supported on the removable port sleeve, it is possible to change or modify the type and shape and size of the valve head and co-operating seal quite easily.
Other features of this invention will now be explained with reference to an exemplary embodiment of a governor depicted in section in the accompanying drawing.
The governor comprises a hollow body having a main part 1 and a cover part 2. The governor would be connected to a gas supply in known manner and has an inlet 3. The body has an internal partition 4 which separates the inlet 3 from an outlet 5 and the partition 4 has an opening therein of circular section.
A port sleeve 6 of substantially cylindrical shape with suitable port(s) 7 in the side wall opening to the inlet 3 is located in the body and is secured thereto by a clamping ring 8 which is fastened to the partition 4.
A valve extends co-axially through the port sleeve 6 and comprises a head 9 which is a partspherical shape and arranged to co-operate with an annular resilient lip seal 10 that is located on an annular internal flange 11 adjacent one end of the port sleeve 6 and held in place by the clamping ring 8. To ensure accurate location of the seal 10 complemantary groove/rib formations are provided on the seal and clamping ring. The seal
10 has a short thin lip that engages the partspherical surface of the valve head 9 in operation
and by this arrangement adequate sealing can be
achieved despite slight tolerances in assembly and
manufacture.
A stem 12 extends from the valve head 9
through the port sleeve, and at the free end a
compensating diaphragm 13 is mounted thereon
by a flanged nut 14. The peripheral edge of the diaphragm 13 is secured between the end of the port sleeve 6 and a recess formed in the body 1 and held there by the clamping pressure applied to the port sleeve by the clamping ring 8.
Another stem 1 5 extends from the valve head 9 in the opposed axial direction through the partition and past the seal 1 0. The free end of stem 1 5 amounts a main diaphragm 16 of which the peripheral edge is clamped and secured between the main body part 1 and the cover part 2. The centre of the diaphragm 1 6 is supported on one side by a back-plate 1 7 and there is a pressure plate 1 8 on the other side. The diaphragm centre and plates 1 7 and 1 8 are secured to the stem by means of threaded nuts on the stem.
The cover part 2 is formed with a hollow boss 19 in which a spring 20 is housed and one end of the spring engages the pressure plate 1 8 whilst the other abuts another pressure plate 21 which is adjustable within the boss 1 9 by means of screw threaded engagement therewith. The boss 1 9 is closed by a cap 22 which can be removed to adjust the spring 20 which applies a force to the valve to set the pressure required.
The diaphragms are of thin elastomeric material, and may be moulded from plastics or rubber materials. The body parts may be castings of suitable metal, and so may be the port sleeve and the valve. However, the parts may be made of any suitable material by any manufacturing process of processes.
The main diaphragm 1 6 in conjunction with the partition provides an outlet chamber 23. A through passageway 24 extending through the valve stems and the valve head provides a communication between the outlet chamber and a low pressure chamber 25 that is provided in the body 1 and closed by the compensating diaphragm 13. The compensating diaphragm 13 in conjunction with the port sleeve 6 and the partition 4 provides an inlet chamber 26.
In operation of the governor, it will be understood that high pressure gas enters the inlet chamber 26 and the valve is open under the influence of the spring force and balancing forces applied through the main diaphragm by the pressure in the outlet chamber. Variations in the inlet pressure are compensated for by the reaction of the compensating diaphragm acting on the valve, and pressure equalisation between the outlet chamber 23 and the low pressure chamber 25 is achieved by the flow between the two through the passageway 24. When the pressure in the outlet chamber 23 increases higher than the governor is adjusted for, the pressure applied to the main diaphragm 1 6 is such as to overcome the spring bias so that the main diaphragm moves the valve towards the seal to close flow.Conversely, as the pressure acting on the main diaphragm reduces, the spring force dominates and moves the valve away from the seal to increase the flow through the valve.
In order to accommodate the movement of the main diaphragm 16, the cover is vented to atmosphere through a small vent 27.
Following the preceding description of the construction and operation of the governor, it wi be understood that the valve is movable axially in operation and is subject to the opposing forces applied thereto. In prior constructions of gas governors using balanced diaphragms, it has been the practice to use a poppet valve having a stem to which one or more diaphragms are coupled for actuating the valve. In such constructions the valve is liable to twist having regard to the inherent instability of the thin resilient diaphragms which are employed. By this invention, the valve is not subject to such twisting forces as the diaphragms act on the opposed stems of the valve, and in addition, by the special form of the head and the lip seal, a degree of self-alignment and compensation can be accommodated.
In the manufacture of the governor there are certain advantages in minimising machining of the body by empioying the port sleeve which is seated and sealed to small internal machined surfaces of the body. Additionally, by providing the co-axial arrangement for the valve, port sleeve and the chambers, the valve can be assembled easily in the body from the open side that is later closed by the cover part. This also is of advantage in servicing or maintaining the governor and permits readily of access to the essential parts. If required, the seal can be checked and replaced and by providing a range of port sleeves and valves with complementary seals, changes for different operating conditions can be made easily.
Certain modifications to the form of the body and cover part of the governor are envisaged, particularly as different attitudes for the in!et and outlet may be required. The port sleeve can be located and secured by other arrangements such as a threaded flanged nut to be received in a threaded recess or the like provided in the partition in the body.
Other advantages and merits of this invention will be appreciated by those skilled in this field.
Claims (9)
1. A gas pressure governor comprising a hollow body having an inlet and an outlet separated by a partition mounting a valve seat, a valve responsive to inlet pressure and having a head for cooperation with the seat to control flow through the outlet and having opposed stems extending axially from the valve head, one stem adjacent the inlet mounting a compensating diaphragm acting on the valve, and the other stem downstream of the valve seat mounting a main diaphragm, the valve being supported at opposed ends by said diaphragms for axial movement relative to the valve seat, and adjustable spring bias means acting on said valve providing a force for controlling actuation of the valve at required pressures, the arrangement being such that the valve is subject to the spring force and is moved axially relative to the valve seat by the compensating diaphragm in response to inlet pressure variations upstream of the valve and moved by the main diaphragm in response to variations in pressure downstream of the valve whereby the valve is closed on the seating when pressure on the main diaphragm exceeds the control force applied by the spring means.
2. A governor according to claim 1 wherein the valve head is of part-spherical shape and the seat comprises a resilient lip seal mounted in an annular opening formed in the partition.
3. A governor according to claim 2 wherein the oppositely extending valve stems project respectively into inlet and outlet chambers which are separated in the body by the partition.
4. A governor according to claim 3 wherein the inlet chamber is defined by the partition and the compensating diaphragm so that changes in inlet pressure act on one face of the diaphragm with the other face of the diaphragm being subject to pressure in the outlet chamber through a passageway interconnecting the outlet chamber to a low pressure chamber in the body remote from the valve seat and closed by the compensating diaphragm.
5. A governor according to claim 4 wherein the passageway extends through the valve head and the opposed valve stems of the valve.
6. A governor according to claim 5 wherein the compensating diaphragm is mounted in the body by a port sleeve of which one end locates the peripheral edge of the compensating diaphragm in an annular recess in the body.
7. A governor according to claim 6 wherein the port sleeve is provided with an annular inwardly directed flange on which the lip seal is located by a clamping ring which is secured to the partition to hold the assembly of the port sleeve and seal and compensating diaphragm in position.
8. A governor according to any one of the preceding claims wherein the body comprises two main parts, one providing the inlet and outlets separated by the partition and the other providing a mounting for the spring bias means and for mounting the main diaphragm on the first part.
9. A gas pressure governor substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8019944A GB2077885A (en) | 1980-06-18 | 1980-06-18 | Governor for regulating and controlling gas pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8019944A GB2077885A (en) | 1980-06-18 | 1980-06-18 | Governor for regulating and controlling gas pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2077885A true GB2077885A (en) | 1981-12-23 |
Family
ID=10514136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8019944A Withdrawn GB2077885A (en) | 1980-06-18 | 1980-06-18 | Governor for regulating and controlling gas pressure |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2077885A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4830045A (en) * | 1987-09-11 | 1989-05-16 | Fuji Engineering Co., Ltd. | Breaker valve |
| WO1998043141A1 (en) * | 1997-03-22 | 1998-10-01 | Bg Plc | Underground pressure regulating module |
| EP1180735A1 (en) * | 2000-08-17 | 2002-02-20 | Dan Bron | Pressure regulator |
| EP2843277A1 (en) * | 2013-09-02 | 2015-03-04 | Johnson Electric S.A. | Gas shut-off valve |
| DE102015109694A1 (en) * | 2015-06-17 | 2016-12-22 | Johnson Electric Germany GmbH & Co. KG | Shut-off valve for installation in gas meters and method of operating the same |
-
1980
- 1980-06-18 GB GB8019944A patent/GB2077885A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4830045A (en) * | 1987-09-11 | 1989-05-16 | Fuji Engineering Co., Ltd. | Breaker valve |
| WO1998043141A1 (en) * | 1997-03-22 | 1998-10-01 | Bg Plc | Underground pressure regulating module |
| EP1180735A1 (en) * | 2000-08-17 | 2002-02-20 | Dan Bron | Pressure regulator |
| EP2843277A1 (en) * | 2013-09-02 | 2015-03-04 | Johnson Electric S.A. | Gas shut-off valve |
| KR20150026995A (en) * | 2013-09-02 | 2015-03-11 | 존슨 일렉트릭 에스.에이. | Gas shut-off valve |
| CN104421480A (en) * | 2013-09-02 | 2015-03-18 | 德昌电机(深圳)有限公司 | Gas shut-off valve |
| US9784382B2 (en) | 2013-09-02 | 2017-10-10 | Johnson Electric S.A. | Gas shut-off valve |
| CN104421480B (en) * | 2013-09-02 | 2019-08-13 | 德昌电机(深圳)有限公司 | Gas shutoff valve |
| KR102195270B1 (en) | 2013-09-02 | 2020-12-28 | 존슨 일렉트릭 인터내셔널 아게 | Gas shut-off valve |
| DE102015109694A1 (en) * | 2015-06-17 | 2016-12-22 | Johnson Electric Germany GmbH & Co. KG | Shut-off valve for installation in gas meters and method of operating the same |
| DE102015109694B4 (en) * | 2015-06-17 | 2017-06-29 | Johnson Electric Germany GmbH & Co. KG | Shut-off valve for installation in gas meters and method of operating the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |