1. Field of the Invention
The present invention relates to a modular gas safety valve arrangement of the type used in natural gas and liquid propane (LP) gas fireplaces or other appliances.
2. Description of the Related Art
In a typical appliance installation, such as a gas fireplace, furnace, space heater, cooking appliance or HVAC unit, the natural gas or LP gas is delivered by means of a gas control valve having a gas supply inlet and a gas supply outlet, the latter being connected to the inlet of the main burner. The control valve supplies gas both to the main burner and to the pilot in the case of a standing pilot system. Depending on the amount of control desired by the user, such a gas control can either be an on/off valve which is controlled manually by actuating a control knob or controlled electrically by means of a solenoid or motor. The flame can also be controlled by adjusting the amount of flow through a modulating control valve by actuation of a manual control knob or a stepper motor. It is also necessary to configure the valve for either natural gas, which requires a larger orifice under low flame conditions or LP gas, which requires a smaller orifice for the same flow rate.
Presently, companies that manufacture and supply such gas control valves often must manufacture separate models of valves for the various configurations described above. This results in added tooling and manufacturing costs and higher inventory requirements.
The present invention is an arrangement whereby a common valve unit with common pilot and ignition controls can be employed in a variety of control configurations, such as solenoid on/off, manual modulation and electrical modulation and for either LP or natural gas operation. The gas valve arrangement is modified to any one of the six configurations identified above by selecting one of a manual modulating control module, a solenoid on/off control module or an electrically modulating control module employing, for example, a stepper motor. Configuring the various controls for LP or natural gas merely requires interchanging an insert adjusting the movement of a portion of the valve mechanism.
The invention greatly reduces inventory by enabling a single valve unit that includes the usual pilot and ignition controls to be supplied with one of a plurality of control modules to permit manual modulation, electrical modulation or remotely controlled solenoid on/off operation. A customer who has purchased a manually modulating modular gas valve mechanism can upgrade to an electrically modulating mechanism or on/off solenoid mechanism, both of which can be remotely controlled, merely by replacing the modular control mechanism with either a solenoid or stepper motor control mechanism. No other modifications to the overall valve mechanism are needed.
The gas valve arrangement includes a valve mechanism that is disposed in a chamber to control the flow of gas from an inlet to an outlet and further includes an interchangeable valve control module that has an actuator that controls the movement of the valve mechanism. A diaphragm seal is disposed between the control module and the valve mechanism to seal the valve chamber from the control module.
In one embodiment, the diaphragm seal is connected to the valve mechanism and gas pressure from the chamber will urge the diaphragm seal in one direction to move the valve mechanism. An actuator of the control module engages the valve mechanism through the diaphragm seal to move the valve mechanism in the opposite direction.
In one form of the invention, the modular gas valve arrangement includes a housing having a valve chamber with a gas inlet and a gas outlet and a valve mechanism disposed in the chamber between the inlet and the outlet to control the flow of gas from the inlet to the outlet. An interchangeable valve control module is mounted to the housing and has a valve actuator that moves the valve mechanism to control the position of the valve mechanism to thereby control the flow of gas from the inlet to the outlet. A seal is disposed between the control module and the valve mechanism to fluidly seal the valve chamber from the control module.
In another form of the invention, there is provided a modular gas valve arrangement that has a housing including a valve chamber with a gas inlet and a gas outlet and a valve mechanism disposed in the chamber between the inlet and the outlet to control the flow of gas from the inlet to the outlet. A valve control module is mounted to the housing and has a valve actuator that moves the valve mechanism to control the position of the valve mechanism to thereby control the flow of gas from the inlet to the outlet. A diaphragm seal member connected to the valve mechanism is disposed between the control module and the valve mechanism. One side of the diaphragm seal is exposed to gas pressure within the valve chamber to thereby move the valve mechanism under the influence of the gas pressure acting on the diaphragm seal.
The modular gas flow arrangement in accordance with one embodiment of the present invention is a modification to the Model AF-1000 gas control valve manufactured by American Flame, Inc., doing business as Skytech Products Group and located in Fort Wayne, Ind. Said gas control valve is expressly incorporated herein by reference. Although the gas valve 13 can be used with a wide variety of gas appliances, such as furnaces, space heaters, cooking appliances and the like, it will be described in the present application in the context of a gas fireplace. Modular control mechanism 11 shown in
Referring now to
A hemispherical silicone diaphragm seal 36 is received within opening 30 and held in place against shoulder 38 by means of threaded seal retainer 40. Diaphragm seal 36 is resiliently captured on the head of shuttle 42 and includes an inwardly extending lip 43 disposed with an annular groove 44. Diaphragm seal 36 is very flexible so that it can double back on itself as shuttle 42 moves axially. Shuttle 42 nests within second shuttle 46 and both shuttles 42 and 46 are retained within valve body 16 by means of retaining ring 48 which is held in place by crimping the proximal edge 50 of valve body 16. Shuttle 42 carries circular seal 52 on its distal end and shuttle 46 carries circular seal 54 on its distal end. Shuttle 46 includes LP orifice 56 that is in alignment with orifice 58 in seal 54. Coil spring 60 is disposed between a shoulder on the proximal end of shuttle 46 and bears against surface 64 of valve body 16. Coil spring 62 is disposed between a shoulder on shuttle 42 and surface 65 (
Valve body 16 includes passage 70 that is in communication with opening 66 and window 68 and extends to natural gas orifice 72. Seal 74 is pressed against shoulder 76 when the valve mechanism is advanced to the low flow positions shown in
At axial positions between the high flow position of
The valve mechanism just described permits a single control module that is identical in all respects with the exception of inserts 82 and 86 to accommodate natural gas and LP gas in a manually controlled modulating control mechanism.
Turning now to
In
A third option is to replace manual module 11 or electrical modulating module 95 with a solenoid mechanism that will be substantially identical to the electrically modulating module 95 except that its actuating shaft (not shown) would have only two positions, the first being the high flow position such as that illustrated in
While the present invention has been described in the context of an exemplary embodiment, the present invention may be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.
This application claims the benefit under Title 35, U.S.C. §119(e) of U.S. Provisional Patent Application Ser. No. 61/158,864, entitled MODULAR GAS VALVE ARRANGEMENT, filed on Mar. 10, 2009, the disclosure of which is expressly incorporated by reference herein.
Number | Date | Country | |
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61158864 | Mar 2009 | US |