Bulb-operated modulating gas valve with minimum bypass

F - Mech Eng,Light,Heat,Weapons – 23 – N

Patent

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F23N 1/00 (2006.01) F23N 5/06 (2006.01)

Patent

CA 2241538

A valve unit provides low pressure unregulated gas flow and high pressure regulated gas flow to a burner and comprises a main diaphragm valve (4) and a bypass diaphragm valve (13) which are opened by pressure differentials on their respective valve diaphragms (9, 19). A regulator valve (26) and a snap valve (27) modify gas pressure applied to the main and bypass valves diaphragms respectively. A control means (28) actuates the regulator and snap valves based on degree of temperature deficiency sensed in a monitored space. The control means opens the snap valve (27) to provide unregulated gas flow when low gas pressure is required, and opens the regulator valve (26) to provide regulated high flow when high gas pressure is required.

Un ensemble soupapes permettant un écoulement de gaz basse pression non régulé et un écoulement de gaz haute pression régulé dans un brûleur comprend une soupape principale à diaphragme (4) et une soupape de dérivation à diaphragme (13) s'ouvrant par un système à pression différentielle au niveau de leur diaphragme respectif (9, 19). Une soupape de régulation (26) et une soupape à enclenchement (27) modifient la pression de gaz appliquée au diaphragme de la soupape principale et au diaphragme de la soupape de dérivation, respectivement. Un mécanisme de commande (28) active la soupape de régulation et la soupape à enclenchement en fonction du niveau d'insuffisance de température détecté dans un espace surveillé. Le mécanisme de commande ouvre la soupape à enclenchement (27) pour provoquer un écoulement de gaz non régulé lorsque du gaz basse pression est voulu, et ouvre la soupape de régulation (26) pour provoquer un écoulement de gaz régulé à grand débit lorsque du gaz haute pression est voulu.

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