GB2251915A - A gas control valve - Google Patents

A gas control valve Download PDF

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Publication number
GB2251915A
GB2251915A GB9024911A GB9024911A GB2251915A GB 2251915 A GB2251915 A GB 2251915A GB 9024911 A GB9024911 A GB 9024911A GB 9024911 A GB9024911 A GB 9024911A GB 2251915 A GB2251915 A GB 2251915A
Authority
GB
United Kingdom
Prior art keywords
gas
valve
piston rod
sealing member
control means
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.)
Granted
Application number
GB9024911A
Other versions
GB9024911D0 (en
GB2251915B (en
Inventor
John Goldie Park
Ian Robert Hamilton Young
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.)
JOHNSON CONTROLS
Original Assignee
JOHNSON CONTROLS
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 JOHNSON CONTROLS filed Critical JOHNSON CONTROLS
Priority to GB9024911A priority Critical patent/GB2251915B/en
Publication of GB9024911D0 publication Critical patent/GB9024911D0/en
Publication of GB2251915A publication Critical patent/GB2251915A/en
Application granted granted Critical
Publication of GB2251915B publication Critical patent/GB2251915B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1919Control of temperature characterised by the use of electric means characterised by the type of controller
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/007Regulating fuel supply using mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00Valves, nozzles or pumps
    • F23N2235/12Fuel valves
    • F23N2235/14Fuel valves electromagnetically operated

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)

Abstract

A valve for controlling gas flow in a gas appliance comprises a piston rod (3), control means for actuating the piston rod (3) and a sealing member (15) mounted on the rod (3) and cooperating with a valve seat (31) for infinitely varying the flow of gas through the valve. <IMAGE>

Description

GAS CONTROL VALVES This invention relates to gas control valves and, more particularly to a gas control valve for use in a combination boiler.
Combination boilers are generally installed for domestic use, particularly in relatively small dwellings where space is at a premium as the boiler combines the necessary equipment for both central heating and domestic hot water and saves installation space.
A complication of this type of system is that a variable operating rate is required which is determined by the varying requirements for central heating and amounts of domestic hot water. This variable requirement requires some type of variation control.
The gas appliances mentioned above normally embody some form of gas sequence control in order to meet the requirements for safe automatic operation. This normally requires a double (twin) safety shut-off gas valve whereby the main gas supply flows through two valves arranged in series.
One known gas control valve comprises a valve connected to a solenoid for actuation of the valve. The solenoid moves a piston rod of the valve back and forth between an open condition and a closed condition depending upon whether the boiler is in an operating or a dormant condition. With this present system, the valve is either in a fully opened or fully closed condition which offers little flexibility in operating conditions actually required by users of the system The present invention therefore aims to provide a gas control valve which overcomes or at least mitigates the above disadvantages associated with the known valves.
According to one aspect of the present invention there is provided a valve for controlling gas flow in a gas appliance comprising a piston rod, control means for actuating the piston rod and gas flow control means for infinitely varying the flow of gas through the valve.
Preferably, the control means for actuating the piston rod comprises a magnetic-shunt type solenoid.
Advantageously, the gas flow control means comprises a sealing member mounted on a leading end of the piston rod, which sealing member corresponds with a gas outlet, through which gas flows in the appliance to vary the flow of gas through the valve.
Preferably, the sealing member is a body of revolution having a tapered profile defining a variable gap between the sealing member and the periphery of the gas outlet valve when the sealing member is in corresponding relation with the gas outlet.
In order that the present invention may be more readily understood and so that further features thereof may be appreciated, reference will now be made to the accompanying figures, in which: Figure 1 is a cross-sectional view of a gas control valve according to one aspect of the present invention in a closed condition, and Figure 2 is a cross-sectional view of a gas control valve of Figure 1 in an open condition.
Reference will now be made to the figures, in which a gas control valve generally indicated at 1 comprises a valve piston rod 3. The stroke of the piston rod 3 is controlled by an actuation control means (not shown) which may be in the form of a "magnetic shunt" type solenoid which can be designed to meet the particular operating conditions required for the system.
The leading end of the piston rod 3 has a raised portion 5 through which a circular bore 7 extends axially within the piston rod 3.
An annular, substantially plate-like member 9 is mounted on the leading end of the piston rod 3 over the raised portion 5. The member 9 has an annular groove 11 approximately midway between the inner and outer edges of the member 9.
The plate-like member 9 is retained in position on the leading end of the piston rod 3 by a screw 13 (or any other suitable fixing member) which is passed into the axial circular bore 7 in the leading end of the piston rod 3.
A valve cap generally indicated at 15 comprises a generally circular stopper portion 17. The walls of the stopper portion have a tapered form, the stopper portion 17 being frustoconical in cross-section. The cap 15 has an internal, circular recess 19 which has a raised, annular lip 21 corresponding in position and form to the groove 11 in the plate-like member 9.
The cap extends horizontally from the annular lip 21 to form a shoulder region 23, the extreme outer position of which has an upstanding lip 25 of relatively small diameter ending in an overhanging portion 27. The overhanging portion 27 defines with the shoulder region 23, a circular recess 29 in the lip 25 for receiving the extreme ends of the plate-like member when the valve cap 15 is in position on the leading end of the piston rod 3.
The valve cap 15 may be formed of a resilient material to enable the cap 15 to be placed over the plate-like member 9 mounted on the leading end of the piston rod 3.
A gas outlet having a valve seat generally indicated at 31 comprises a cylindrical member 33 having an insert 35 formed adjacent the open end thereof. The insert 35 is provided with an internal, upstanding lip 37.
In use of the above described gas control valve, as shown in Figure 1 in the closed condition, the piston rod 3 is fully extended by the control means. In this condition, the stopper portion 17 of the valve cap is fully inserted in the valve seat 31. The upstanding lip 37 of the valve seat insert 35 abuts the shoulder region 23 of the cap 15 thus effectively sealing the valve.
The insert 35 and the wall of the stopper portion 17 define an annular gap which tapers towards the abutment position of the upstanding lip 37 of the insert 35 and the shoulder region 23 of the cap 15.
As the piston rod 3 is-retracted by the cqntrol mechanism, the stopper portion 17 of the cap 15 is gradually drawn from the cylindrical valve seat 31. As this occurs, the annular gap between the wall of the stopper portion 17 and the insert 35 increases and thus allows a greater volume of gas to flow through the valve. This results in a greater degree of controlled variability of gas valves than has, in the past, been possible using known valves.
The control signal for the piston rod 3 can be derived from a suitable electronic temperature control system, provided with one or more sensors. Thus control may be combined with or separate from the gas sequence control.
The control signal which may be DC or pulse width modulated may be delivered to suitable magnetic shunt-type solenoid in order to obtain the necessary stroke to meet the infinite adjustment control requirements.
A further application of the gas control valve as described in conjunction with an electronic control may be to provide a slow opening characteristic which could find application in particular in gas appliances requiring this characteristic to obtain satisfactory ignition of the main burner.

Claims (5)

Claims
1. A valve for controlling gas flow in a gas appliance comprising a piston rod, control means for actuating the piston rod and gas flow control means for infinitely varying the flow of gas through the valve.
2. A valve according to Claim 1, wherein the control means for actuating the piston rod comprises a magneticshunt type solenoid.
3. A valve according to Claim 1 or 2, wherein the gas flow control means comprises a sealing member mounted on a leading end of the piston rod, which sealing member corresponds with a gas outlet, through which gas flows in the appliance to vary the flow of gas through the valve.
4. A valve according to any one of the preceding Claims, wherein the sealing member is a body of revolution having a tapered profile defining a variable gap between the sealing member and the periphery of the gas outlet valve when the sealing member is in corresponding relation with the gas outlet.
5. A valve substantially as hereinbefore described with reference to and as shown in the accompanying drawings
GB9024911A 1990-11-16 1990-11-16 Gas control valves Expired - Fee Related GB2251915B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9024911A GB2251915B (en) 1990-11-16 1990-11-16 Gas control valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9024911A GB2251915B (en) 1990-11-16 1990-11-16 Gas control valves

Publications (3)

Publication Number Publication Date
GB9024911D0 GB9024911D0 (en) 1991-01-02
GB2251915A true GB2251915A (en) 1992-07-22
GB2251915B GB2251915B (en) 1995-04-19

Family

ID=10685462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9024911A Expired - Fee Related GB2251915B (en) 1990-11-16 1990-11-16 Gas control valves

Country Status (1)

Country Link
GB (1) GB2251915B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1405848A (en) * 1972-01-29 1975-09-10 Bosch Gmbh Robert Internal combustion engines
GB2121520A (en) * 1982-06-10 1983-12-21 United Gas Industries Ltd Gas valve means
GB2173573A (en) * 1985-03-15 1986-10-15 Cambridge Instr Ltd Gas valve

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1601375A (en) * 1970-12-10 1981-10-28 Mannesmann R C Fluid flow rate control device
GB1487443A (en) * 1976-04-12 1977-09-28 Rowley H Flow control tap washer and jumper valve
GB2051316A (en) * 1979-06-26 1981-01-14 Vendy M J Valves

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1405848A (en) * 1972-01-29 1975-09-10 Bosch Gmbh Robert Internal combustion engines
GB2121520A (en) * 1982-06-10 1983-12-21 United Gas Industries Ltd Gas valve means
GB2173573A (en) * 1985-03-15 1986-10-15 Cambridge Instr Ltd Gas valve

Also Published As

Publication number Publication date
GB9024911D0 (en) 1991-01-02
GB2251915B (en) 1995-04-19

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20051116