Abstract: The present invention is an apparatus for preventing gas leakage from gas burning equipment, which comprises an electromagnetic valve which normally closes the gas passage near the gas supplying source, a gas pressure detector for measuring the gas pressure in the gas passage to detect a defect in the piping, at least one gas burning system having electrical circuits for detecting gas leakage other than that caused by defects in the piping, and a control panel for receiving all of the detection results to control the actuation of the electromagnetic valve and to issue an alarm signal, whereby the gas supply is interrupted when nonburning gas escapes from at least one piece of gas burning equipment which is in use and the alarm signal based on a fault or defect in the piping is issued when the gas escapes during a time that all of the gas burning equipment is kept in a non-use condition.

Abstract: A fuel ignition system of the pilot ignition type including a control circuit for operating pilot and main valves of a redundant valve assembly, the control circuit having control relays which provide an interlock on start-up to prevent the energization of the valves under certain failure conditions, the control circuit including a flame sensing circuit which is operable to prevent start-up of the system when a flame is provided as the result of a leak condition for the pilot valve, and to terminate an ignition cycle causing complete shut off of fuel whenever a flame is provided as the result of a leak condition for the main valve.

Abstract: In combination with a plurality of gas burning appliances and a gas source therefor, a gas distribution system having a main feed line connected at one end thereof to the gas source, a manifold feed means having a single inlet connected to another end of said main feed line and having a plurality of outlets, and a plurality of individual flexible feed lines each connected at one end thereof to each of the plurality of outlets of the manifold feed means, and connected at another end thereof to each inlet of the plurality of gas burning appliances. The individual feed lines are connected with at least one of the said burning appliances or the manifold means with a shutoff, quick disconnect coupling, which may have a fusible safety cutoff means including an element which responds to excessive heat to effect closing of a valve in said quick disconnect coupling to thereby block propagation of a flame wave through the coupling.

Abstract: A sequencing and monitoring control device for fuel burners is provided having a unique burner program. The fuel burner is put into operation with an ignition means turned on, along with fuel pressure and combustion air, but without fuel being intentionally introduced into the combustion chamber. This start-up procedure would ignite any leakage fuel. The ignition is ended and an attempt is made to sense whether a flame exists thereby indicating the presence of leakage fuel. If any flame exists, the system shuts down on safety. If none exists, the sequence proceeds to a preselected burner sequence.

Abstract: A control arrangement for use in an automatic fuel ignition system for providing electronic detection of a leak condition for a pilot valve operable to supply fuel to a pilot outlet for ignition to establish pilot flame includes a flame sensing circuit which effects operation of a main valve when a pilot flame is established, the flame sensing circuit maintaining the main valve deenergized when a pilot flame is established during an ignition interval and permitting a delay device to deenergize the pilot valve for a time to interrupt the supply of fuel to the pilot outlet to attempt to extinguish the pilot flame, and a time out device operable to deactivate the system when the delay device fails to cause the pilot flame to be extinguished, the flame sensing means overriding the delay device and the timeout device when the pilot flame is established at the end of the ignition interval.

Abstract: An automatic fuel ignition system which provides automatic detection of a leak condition for a pilot valve which is operable to supply fuel to a pilot burner for ignition to establish pilot flame and a main valve which is operable to supply fuel to a main burner for ignition by the pilot flame of the system including a control circuit operable in response to a request signal to activate the system tentatively, a delay circuit which delays the operation of the pilot valve for a first delay period after the occurrence of the request signal, a flame sensing circuit which senses the presence of the pilot flame and effects operation of the main valve after a second delay period established by the control circuit, the flame sensing circuit being responsive to the presence of a flame at the pilot burner during the first delay period or at the main burner during the second delay period to cause the system to be deactivated.

Abstract: A valve assembly including a gas valve having first and second redundant valve members which are individually operable to open and close respective inlet and outlet valve ports, and a pressure regulating apparatus interposed between the inlet and outlet valve ports operable to control gas flow to the outlet valve port when the first and second valve members are operated, and a leak detection apparatus for detecting a leak across one of the valve ports, including a pressure diaphragm operated valve which is maintained open responsive to gas flow through both the valve inlet port and the valve outlet port to permit gas flow to an outlet of the valve, the valve being operated to close in the event of gas flow for a predetermined time through only one of the ports indicative of a leak condition for the port.

Abstract: A flash back arrestor for use in gas supply lines. The arrestor includes an elongated passageway through which the gases flow in one direction and through which the flash back must pass in the reverse direction. A pressure-actuated valve at the inlet end of the passageway is actuated by pressures from the flash back at the discharge end of the passageway. The valve consists of a valve member in the form of a piston freely movable under the influence of flash back pressures against a valve seat at the inlet to the passageway. The valve member carries a locking arrangement which moves under the influence of the flash back to latch the valve member with a biasing force to the closed position after a flash back occurs. Additionally, a second valve is provided actuated by the flash back to vent the flash back to the atmosphere. A separate flow actuated check valve prevents backflow to the gas supply tank in the event the flow direction should reverse, not caused by a flash back.