Differential pressure relief valve

Details Differential pressure relief valve Differential pressure relief valve

G - Physics

05

D

137/43.2

G05D 16/00 (2006.01) F16K 17/08 (2006.01) F16K 31/365 (2006.01) F16L 55/04 (2006.01)

Patent

CA 1085262

ABSTRACT A differential pressure relief valve formed of a housing having first and second chambers sealed from the atmosphere and separated by an annular diaphragm with the chambers and the annulus of the diaphragm traversed by a moveable sleeve. The first chamber communicates to a primary pressure source through a first channel in the housing and the second chamber communicates to a secondary pressure source through holes provided in the sleeve and then to a second channel in the housing. The end of the sleeve protruding from the second chamber is engageable with a seat in the housing. The arrangement is such that when the primary pressure exceeds the secondary pressure by a predetermined amount, the end of the sleeve protruding from the second chamber engages the seat but if the primary pressure does not exceed the sec- ondary pressure by the predetermined amount, the end of the sleeve does not engage the seat, and fluid escapes from the source through the second channel and communicating sleeve, past the seat.

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