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GB2598593A - Method and device for closing a gas pressure regulator - Google Patents

Method and device for closing a gas pressure regulator Download PDF

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Publication number
GB2598593A
GB2598593A GB2013844.2A GB202013844A GB2598593A GB 2598593 A GB2598593 A GB 2598593A GB 202013844 A GB202013844 A GB 202013844A GB 2598593 A GB2598593 A GB 2598593A
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GB
United Kingdom
Prior art keywords
pressure
gas
valve
control
vent
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.)
Pending
Application number
GB2013844.2A
Other versions
GB202013844D0 (en
Inventor
Eisenga Frank
Mostert Lianne
Klijs Peter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gavilar BV
Original Assignee
Gavilar BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gavilar BV filed Critical Gavilar BV
Priority to GB2013844.2A priority Critical patent/GB2598593A/en
Publication of GB202013844D0 publication Critical patent/GB202013844D0/en
Publication of GB2598593A publication Critical patent/GB2598593A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F23K5/007—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05002—Valves for gaseous fuel supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

An apparatus and method for isolating the gas supply in a gas pressure regulation valve, the valve including a housing 1 with a gas inlet port 3 and a gas outlet port 4, at least one valve seat 9,10 cooperating with at least one valve element 7, 6 rigidly connected to a valve stem 5 and in the gas path between the gas inlet port and the gas outlet port. The valve stem is connected to a control head 2 that includes a pressure chamber 11 and a vent chamber 12, the vent chamber being connected to the environment by means of a controlled vent conduit 13. In use, in response to a change in pressure in the vent conduit and a consequential pressure change in the vent chamber, the valve stem presses the at least one valve element onto the at least one valve seat and shuts off the gas path. A control unit 18 may control a three-way valve 16 associated with a pressure vessel 15 and a bleed arrangement 17, and the control unit may control actuation of the regulation valve by controlling the pressure in the vent chamber. The regulation valve can be closed by applying an under-pressure (vacuum) or an overpressure to the vent chamber.

Description

Method and device for closing a gas pressure regulator DESCRIPTION The invention relates to a method and a shut-off device for closing a gas pressure regulator, also known as a gas pressure control device. The gas pressure regulator comprises: a housing having a gas inlet port and a gas outlet port; a control body in the gas path between the gas inlet port and the gas outlet port, the control body comprising a control valve seat and optionally a gas-failure valve seat; a valve stem, which is connected to a control cap; a control valve element rigidly connected to the valve stem; and optionally a gas-failure valve element rigidly connected to the valve stem, the control cap comprising a pressure chamber and a vent chamber, the vent chamber being connected to the environment by means of a vent conduit.
Such a shut-off device and method is known from European patent application 1 923 631 A2, in which a bi-stable three-way valve and an electronic control unit are connected to a gas pressure regulator. The object of this shut-off device is to remotely shut off the gas supply through the gas pressure regulator, for instance in the event of an emergency such as a fire. To this end, gas conduits are provided from the three-way valve to the pressure chamber, to the gas inlet port, and to the gas outlet port. This solution has the disadvantage that existing gas pressure regulators already installed in homes cannot easily be provided with such a shut-off device. New gas connection conduits must be fitted to the gas inlet port and gas outlet port of the gas pressure regulator. In addition, a new connection must be made to the pressure chamber of the gas pressure regulator so that the pressure chamber can be supplied with the pressure at the gas inlet port causing the control valve to close. These modifications are labour-intensive and expensive because they cannot be mounted by an installer on an installed gas pressure regulator without disassembling the gas pressure regulator and without specialist testing equipment and tools. Moreover, this solution can only be applied to gas pressure regulators with a control valve.
German Patent application No. 197 29 229 Al also discloses an emergency shut-off device to be fitted in the gas pipe to the gas pressure regulator. An integrated solution for a gas pressure regulator with a shut-off device is also shown. A new connection must be made to the pressure chamber. An adjusting body simultaneously closes the channel between the gas outlet port and the pressure chamber, and opens the vent conduit to the pressure chamber, and closes the bypass conduit over the gas-failure valve element.
This provides the pressure chamber with atmospheric ambient pressure and closes the gas-failure valve element. This complicated shut-off device is part of the housing of the gas pressure regulator and can only be installed with specially designed and adapted parts for the gas pressure regulator. For this purpose, the gas pressure regulator must be de-installed and converted by a certified company. Therefore, the existing gas pressure regulator usually will be entirely replaced by a new specimen and the old gas pressure regulator will be removed. Replacing a properly functioning, durable gas pressure regulator is contrary to the principles of a circular economy. This solution can only be applied to gas pressure regulators with a gas-failure valve element.
Therefore, the object of the present invention is to provide a method and a shut-off device, which can easily, conveniently, reliably and safely be mounted on, and removed from, installed gas pressure regulators -either with a control valve, a gas-failure valve or with both -without the need for complicated modifications to, or new components required for, the gas pressure regulator.
These objects are achieved in the invention by providing a method for shutting off the gas supply in a gas pressure regulator according to the preamble, the method comprising the following steps: providing a control conduit with a pressure facility on the vent conduit; providing a change in pressure in the control conduit by means of the pressure facility, so that through the vent conduit a pressure change is realised in the vent chamber, whereby the valve stem presses a valve element onto a valve seat and shuts off the gas path.
By making use of the atmospheric part of the gas pressure regulator, a shut-off device can be fitted to an existing and installed gas pressure regulator in a simple, reliable and safe manner. It has been found that by using the existing vent conduit in the vent chamber of the control cap, the control valve element or the gas-failure valve element can be closed simply by applying a partial vacuum or an excess pressure, without the need for complicated modifications or new components for the gas pressure regulator.
Preferably, the pressure change is a pressure reduction, causing the valve stem to press the control valve element against the control valve seat and to shut off the gas path. In particular, the pressure facility is a (vacuum) pumping device. By applying a reduction of pressure in the vent chamber of the control cap, the valve stem is moved upward so that the control valve element is closed on the control valve seat and gas is prevented from flowing from the gas inlet port to the gas outlet port. This partial vacuum can be applied by means of a pumping device suitable for extracting air and for applying vacuum to the control conduit and the therewith connected vent chamber. Furthermore, this method has the advantage that gas is prevented from flowing through the bypass 19 of the gas-failure valve element from the gas inlet port to the gas outlet port, when the control valve element is closed.
In a particular embodiment of the gas pressure regulator, a gas-failure valve element and a gas-failure valve seat are provided, wherein according to the method the change in pressure in the control conduit is a pressure increase, causing the valve stem to press the gas-failure valve element against the gas-failure valve seat and to shut off the gas path. In particular, the pressure facility is a pressure reservoir and/or a pumping device. In one embodiment of the gas pressure regulator, in which a gas-failure valve element and a gas-failure valve seat are provided, the gas pressure regulator can be closed by applying an excess pressure in the control conduit, so that an excess pressure is applied in the vent chamber through the vent conduit, causing the valve stem to press the gas-failure valve element against the gas-failure valve seat and to shut off the gas path. The excess pressure (overpressure) in the vent chamber can be provided with a pressure reservoir in which sufficient air at a high pressure is present to bring, either one or more times, the vent chamber at a sufficient excess pressure to close the gas-failure valve element on the gas-failure valve seat. It is also possible to pressurise the vent chamber to an excess pressure by means of a pumping device, or even by means of the inlet pressure, but then the existing installation must be modified to create a connection point.
Preferably, in the method according to the invention, a three-way valve is provided, or a valve configuration corresponding thereto, wherein the three-way valve is provided in the control conduit between the gas pressure regulator and the pressure facility, and wherein the three-way valve is provided with a valve bleed, wherein in the release position of the three-way valve, the valve bleed is in open communication with the vent conduit of the vent chamber and the connection to the pressure facility is closed, and wherein in the closed position of the three-way valve the pressure facility is in open communication with the vent conduit of the vent chamber and the connection to the valve bleed is closed.
By applying a three-way valve, or a corresponding or equivalent configuration, such as two two-way valves, the method according to the invention can be carried out in a simple manner. In the release position of the three-way valve, the gas pressure regulator is capable of normal operation and control, and the vent conduit of the vent chamber is connected to the ambient pressure or atmospheric pressure by bringing the control conduit in fluid communication with the valve bleed. In the closed position of the three-way valve, this connection between the ambient pressure and the vent chamber is closed, and a fluid communication is established between the vent chamber and the pressure facility to create an excess pressure or partial vacuum in the vent chamber.
The invention also relates to a shut-off device for use in the method, comprising a control conduit and a pressure facility connected thereto for providing a change in pressure in the vent chamber through the control conduit.
In particular, the pressure facility is a pressure reservoir and/or a (vacuum) pumping device. The shut-off device can be used for both a gas pressure regulator with or without a gas-failure valve element, because applying a partial vacuum in the vent chamber causes the control valve element to be closed on the control valve seat, and applying an excess pressure in the vent chamber causes the gas-failure valve element to be closed on the gas-failure valve seat. For this purpose, the pressure facility is a pumping device or a pressure reservoir, with which sufficient air (or another gas such as N2 or CO2 in case of excess pressure from a pressure reservoir) can be supplied at a high pressure to provide the vent chamber with a sufficient excess pressure one or more times to close the gas-failure valve element on the gas-failure valve seat. Or, the pressure facility is a vacuum pump, which is arranged for removing air from the vent chamber and for reducing the pressure therein, so that the valve stem closes the control valve element against the control valve seat.
In a preferred embodiment, the shut-off device comprises a three-way valve, or an equivalent valve configuration, and the three-way valve is provided with a valve bleed, wherein in the release position of the three-way valve, the valve bleed is in open communication with the vent conduit of the vent chamber, closing the connection to the pressure facility, and wherein in the closed position of the three-way valve the pressure facility is in open communication with the vent conduit of the vent chamber, closing the connection with the valve bleed.
In an alternative embodiment, the shut-off device is provided with a control unit, which controls the pressure facility and/or the three-way valve, or an equivalent valve configuration.
In particular, the control unit is provided with a receiver, so that the gas pressure regulator can be closed with the shut-off device by means of a remote transmitter. The above-mentioned measures allow for remotely operating the shut-off device and closing the control valve element, for example, by a utility company when shutting off the utilities in the home of a moving occupant.
The invention will be explained in more detail below with reference to the accompanying drawing, wherein features and other advantages will become apparent.
Figure 1 shows in cross-section a gas pressure regulator with a gas-failure valve element in the control position, wherein the vent conduit of the vent chamber of the control cap is provided with a (schematically shown) shut-off device in the release position; Figure 2 shows in cross-section the gas pressure regulator of figure 1 with the shut-off device in the closed position with a closed control valve element as a result of a partial vacuum in the vent chamber; Figure 3 shows in cross-section the gas pressure regulator of figure 1 with the shut-off device in the closed position with a closed gas-failure valve element as a result of an excess pressure in the vent chamber.
Figure 1 shows a gas pressure regulator 1 with a shut-off device for applying the method according to the invention. The gas pressure regulator comprises a control cap 2, a gas inlet port 3, a gas outlet port 4, a valve stem 5 which is connected to the control cap 2, a gas-failure valve element 6 and a control valve element 7, both of which are rigidly connected to the valve stem 5. The gas pressure regulator is provided with a control body 8, which is arranged in the gas path between the gas inlet port and the gas outlet port. The control body is provided with a control valve seat 9 and with a gas-failure valve seat 10. The gas pressure in the gas inlet port is reduced from a high pressure to a low pressure by means of the control valve element, which is rigidly connected to the valve stem and the control cap. For this purpose, the valve stem 5 is hollow so that the gas pressure at the gas outlet port is equal to the gas pressure in the pressure chamber 11 in the control cap 2. In this way, a control loop is formed, in which the pressure chamber moves the valve stem upward as the outlet pressure rises, so that the control valve element moves towards the control valve seat and the gas path from the gas inlet port to the gas outlet port is throttled or closed. Above the pressure chamber 11, a vent chamber 12 is arranged in the control cap, wherein the vent chamber is in open communication with the (atmospheric) environment by means of a vent conduit 13. When the gas pressure is lowered in the pressure chamber 11, for example because there is no more gas pressure at the gas inlet port 3 due to a gas-failure, the pressure chamber will move the valve stem down(wards) and the control valve element will move away from the control valve seat to its maximum open position, and simultaneously the valve stem presses the gas-failure valve element 6 against the gas-failure valve seat 10, so that the gas-failure valve completely shuts off the gas supply. This movement of the valve stem will increase the volume of the vent chamber 12 and air from the environment will be drawn in through the vent conduit 13. When the valve stem moves in the opposite direction away from the gas-failure valve seat, the volume of the vent chamber will be reduced and air will be blown out to the environment through the vent conduit 13.
The universal shut-off device according to the invention comprises a control conduit 14 and a pressure facility 15 connected thereto. The control conduit is connected gastight to the vent conduit 13 of the vent chamber 12 of the control cap 2. This allows for adjusting the pressure in the vent chamber and thereby to manipulate the position of the valve stem and the valve elements connected to the valve stem.
The universal shut-off device according to the invention can both be used for gas pressure regulators without a gas-failure valve element and for gas pressure regulators without a control valve element.
In the exemplary embodiment of the shut-off device shown in Figure 1, a three-way valve 16, here formed by two two-way valves, is provided in the control conduit 14. In the release position of the shut-off device, the control conduit 14 is in open communication with the valve bleed 17, so that the vent chamber 12 can 'breathe' with the environment through the vent conduit 13.
Furthermore, the shut-off device in Figure 1 is provided with a control unit 18 for (electrically) controlling the pressure facility 15 and/or the three-way valve 16. This control unit 18 is optionally provided with a receiver, so that the gas path from the gas pressure regulator can be closed with the shut-off device by means of a transmitter. This allows for remotely shutting off the gas supply by means of sensors, by a utility company and/or by the resident, for example in the event of emergencies or when moving house.
Figure 2 shows a first embodiment of the invention, in which a pressure reduction is applied in the vent chamber 12 by means of a (vacuum) pressure facility 15 such as a pumping device or other vacuum device. To this end, the three-way valve 16 has been switched to the closed position and the open communication to the ambient pressure has been closed between the valve bleed 17 and the control conduit 14. The control conduit 14 is now in communication with the pressure facility 15, so that a partial vacuum is provided in the vent chamber 12 through the vent conduit 13. As a result, the valve stem 5 has moved up and the control valve element 7 is pressed against the control valve seat 9 and the gas path between the gas inlet port 3 and the gas outlet port 4 is shut off.
This embodiment of the invention can also be applied to gas pressure regulators without a gas-failure valve element.
Gas pressure regulators, which reduce the pressure at the gas inlet port 3 from 100 -mbar to 20 -30 mbar at the gas outlet port 4, are now able to close the control valve element 7 with a pressure reduction of ± 20 -30 mbar resulting in a pressure of 970 -980 mbar-a (absolute) in the vent chamber 12. In practice, a pressure reduction of ± 200 mbar will be applied, so that the pressure in the vent chamber 12 will be approximately 800 mbar-a.
Figure 3 shows a second embodiment of the invention, wherein a pressure increase is applied in the vent chamber 12 by means of a (excess) pressure facility 15 such as a pumping device or another pressure increasing device. For this purpose, the three-way valve 16 has been switched (over) to the closed position, so that the open communication with the ambient pressure is closed between the valve bleed 17 and the control conduit 14. The control conduit 14 is now communicating with the pressure facility 15 so that a pressure increase has been provided in the vent chamber 12 through the vent conduit 13. As a result, the valve stem 5 has been moved downward and the gas-failure valve element 6 is pressed against the gas-failure valve seat 10 and the gas path between the gas inlet port 3 and the gas outlet port 4 is shut off.
This embodiment of the invention can also be applied to gas pressure regulators provided with a gas-failure valve element only.
Gas pressure regulators, which reduce the pressure at the gas inlet port 3 from 100 -200 mbar to 20 -30 mbar at the gas outlet port 4, are now able to close the gas-failure
B
valve element 6 with a pressure increase of 100 mbar in the vent chamber 12. This also allows for using the 100 mbar pressure at the gas inlet 3 as the pressure facility 15.

Claims (6)

  1. CLAIMS1. A method for shutting off the gas supply in a gas pressure regulator, wherein the gas pressure regulator comprises: a housing (1) with a gas inlet port (3) and a gas outlet port (4); a control body (8) in the gas path between the gas inlet port and the gas outlet port, the control body comprising a control valve seat (9) and optionally a gas-failure valve seat (10); a valve stem (5) connected to a control cap (2); a control valve element (7) rigidly connected to the valve stem (5); and optionally a gas-failure valve element (6) rigidly connected to the valve stem (5), the control cap (2) comprising a pressure chamber (11) and a vent chamber (12), the vent chamber being connected to the environment by means of a vent conduit (13), characterised in that the method comprises the following steps: providing a control conduit (14) with a pressure facility (15) on the vent conduit; providing a change in pressure in the control conduit (14) by means of the pressure facility (15), so that through the vent conduit (13) a pressure change is realised in the vent chamber (12), whereby the valve stem (5) presses a valve element (6, 7) on a valve seat (10, 9) and shuts off the gas path.
  2. 2. A method according to claim 1, wherein the pressure change is a pressure reduction, causing the valve stem (5) to press the control valve element (7) against the control valve seat (9) and to shut off the gas path.
  3. 3. A method according to claim 2, wherein the pressure facility is a (vacuum) pumping device.
  4. 4. A method according to claim 1, wherein a gas-failure valve element (6) and a gas-failure valve seat (10) are provided, and wherein the pressure change in the control conduit (14) is a pressure increase, causing the valve stem (5) to press the gas-failure valve element (6) against the gas-failure valve seat (10) and to shut off the gas path.
  5. 5. A method according to claim 2, wherein the pressure facility (15) is a pressure reservoir and/or a pumping device.
  6. 6. A method according to any one of the preceding claims, wherein a three-way valve (16), or an equivalent valve configuration, is provided in the control conduit (14) between the gas pressure regulator (1) and the pressure facility (15), and wherein the three-way valve (16) is provided with a valve bleed (17), wherein in the release position of the three-way valve (16) the valve bleed (17) is in open communication with the vent conduit (13) of the vent chamber (12), and wherein in the closed position of the three-way valve (16) the pressure facility (15) is in open communication with the vent conduit (13) of the vent chamber (12).A shut-off device for use in the method according to one of the preceding claims, comprising a control conduit (14) and a pressure facility (15) connected thereto for providing a change in pressure in the vent chamber (12) through the control conduit.A shut-off device according to claim 7, wherein the pressure facility (15) is a pressure reservoir and/or a (vacuum) pumping device.A shut-off device according to claim 7 or claim 8, wherein the shut-off device is a three-way valve (16), or an equivalent valve configuration, and wherein the three-way valve (16) is provided with a valve bleed (17), wherein in the release position of the three-way valve (16) the valve bleed (17) is in open communication with the vent conduit (13) of the vent chamber (12), and wherein in the closed position of the three-way valve (16) the pressure facility (15) is in open communication with the vent conduit (13) of the vent chamber (12).A shut-off device according to claim 9, wherein a control unit (18) is provided, which controls the pressure facility (15) and/or the three-way valve (16), or an equivalent valve configuration.A shut-off device according to claim 10, wherein the control unit (18) is provided with a receiver, so that the gas pressure regulator (1) can be closed with the shutoff device by means of a remote transmitter. 7. 8. 9. 10. 11.
GB2013844.2A 2020-09-03 2020-09-03 Method and device for closing a gas pressure regulator Pending GB2598593A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2013844.2A GB2598593A (en) 2020-09-03 2020-09-03 Method and device for closing a gas pressure regulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2013844.2A GB2598593A (en) 2020-09-03 2020-09-03 Method and device for closing a gas pressure regulator

Publications (2)

Publication Number Publication Date
GB202013844D0 GB202013844D0 (en) 2020-10-21
GB2598593A true GB2598593A (en) 2022-03-09

Family

ID=72841226

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2013844.2A Pending GB2598593A (en) 2020-09-03 2020-09-03 Method and device for closing a gas pressure regulator

Country Status (1)

Country Link
GB (1) GB2598593A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111560A (en) * 1936-06-20 1938-03-22 Bryant Heater Co Combined diaphragm valve and pressure regulator
GB1361575A (en) * 1971-10-26 1974-07-30 Emerson Electric Co Gas valves
DE2509384A1 (en) * 1974-03-15 1975-09-25 Tecnomeccanica S I T Precisa S Diaphragm valve for regulating gas pressure - attached to household burner, and has three way changeover cock

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2111560A (en) * 1936-06-20 1938-03-22 Bryant Heater Co Combined diaphragm valve and pressure regulator
GB1361575A (en) * 1971-10-26 1974-07-30 Emerson Electric Co Gas valves
DE2509384A1 (en) * 1974-03-15 1975-09-25 Tecnomeccanica S I T Precisa S Diaphragm valve for regulating gas pressure - attached to household burner, and has three way changeover cock

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Publication number Publication date
GB202013844D0 (en) 2020-10-21

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