Automatic shut-off valve

Details Automatic shut-off valve Automatic shut-off valve

1988-03-29

1989-12-26

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Pop valves

137506, F16K 1704

Patent

active

048891541

ABSTRACT:
An automatic shut-off valve having a lower closing pressure than an opening pressure comprises a housing having a partition formed with a valve opening connecting the inlet to the outlet, a valve member movable in the outlet side of the partition to an open or closed position with respect to the valve opening, and a piston movable in the outlet side of the partition independently of the valve member and defining a chamber with the valve member. The piston is urged by a spring tending to close the valve member against the force of inlet pressure. The piston is formed with a passageway establishing communication between the engine chamber and the housing outlet, and has a larger cross-sectional area than the valve member, such that the valve member opens the valve opening at a predetermined inlet pressure and closes the valve opening at a lower inlet pressure.

REFERENCES:
patent: 4192343 (1980-03-01), Grahac

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