US 11,808,452 B2
Intermittent pilot ignition gas valve having protection against negative pressure for internal diaphragms
James E. Pearson, Downers Grove, IL (US); Stephen Sapp, Soddy-Daisy, TN (US); Tony Leeseberg, Elgin, IL (US); Brandon Cole, Chicago, IL (US); and Moises Contreras Hernandez, Itasca, IL (US)
Assigned to Robertshaw Controls Company, Itasca, IL (US)
Filed by James E. Pearson, Downers Grove, IL (US); Stephen Sapp, Soddy-Daisy, TN (US); Tony Leeseberg, Elgin, IL (US); Brandon Cole, Chicago, IL (US); and Moises Contreras Hernandez, Itasca, IL (US)
Filed on Jul. 17, 2020, as Appl. No. 16/932,142.
Claims priority of provisional application 62/875,970, filed on Jul. 19, 2019.
Prior Publication US 2021/0018172 A1, Jan. 21, 2021
Int. Cl. F23N 1/00 (2006.01); F23N 5/20 (2006.01); F23N 5/24 (2006.01)
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
OG exemplary drawing
 
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.