Pressure operated valve

Details Pressure operated valve Pressure operated valve

F - Mech Eng,Light,Heat,Weapons

16

K

123/98.06, 137/4

F16K 31/26 (2006.01) F02M 25/07 (2006.01) F16K 31/00 (2006.01) F16K 31/126 (2006.01)

Patent

CA 1271104

ABSTRACT A pressure operated valve is arranged so that it switches over rapidly between two opposite end posi- tions. The valve has a pressure chamber closed by a diaphragm. Between the diaphragm and the valve member, there is a snap-action spring which continues to hold the valve member in one end position during a first phase of diaphragm movement, and at a preset point snaps over to a condition where it accelerates the valve member into its opposite end position, and holds it there. A biasing spring may oppose the force exerted on the diaphragm by pressure (normally vacuum) in the pressure chamber. The valve has use in EGR systems, as well as engine deceler- ating systems.

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