CPC F23N 1/00 (2013.01) [F23N 5/20 (2013.01); F23K 2900/05001 (2013.01); F23K 2900/05002 (2013.01); F23N 5/242 (2013.01); F23N 2227/24 (2020.01); F23N 2227/30 (2020.01); F23N 2227/32 (2020.01); F23N 2235/14 (2020.01); F23N 2235/18 (2020.01); F23N 2235/20 (2020.01)] | 16 Claims |
1. A gas valve for an intermittent pilot ignition system, comprising:
a valve housing comprising a first fluid pathway between an upstream inlet port and a downstream outlet port and a second fluid pathway between the upstream inlet port and a downstream pilot port;
a first diaphragm disposed in the first fluid pathway between the upstream inlet port and the downstream outlet port, the first diaphragm being biased in a first closed position;
a second diaphragm disposed in the first fluid pathway between the upstream inlet port and the downstream outlet port, the second diaphragm being biased in a second closed position;
at least one valve disposed in the first fluid pathway or the second fluid pathway, the at least one valve configured to prevent the first diaphragm and the second diaphragm from opening under a negative pressure having an absolute value of at least 26″ W.C.
wherein flow of gas through the first fluid pathway from the upstream inlet port to the downstream outlet port requires a positive gas pressure sufficient to open both of the first diaphragm from the first closed position and the second diaphragm from the second closed position.
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