Flow shut off valve

Details Flow shut off valve Flow shut off valve

1974-12-30

1976-04-13

Klinksiek, Henry T.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

F16K 1722

Patent

active

039497798

ABSTRACT:
An improved exerciseable emergency flow shut off device for fluid control systems particularly adapted for use in adverse marine environments. In normal operation the valve spool is continuously exercised by a reversing fluid pressure differential as fluid reversibly flow through the valve. The improved valve includes low breakaway force spool biasing means to reduce the internal fluid resistance of the valve in normal operation and high breakaway force restraining means connected to the shut off means. In the preferred embodiment the spool biasing means and restraining means comprise separate coil springs concentrically located on the spool, the biasing means having a spring rate substantially lower than the restraining means. The biasing coil is reciprocateably compressed in response to the reversing fluid pressure differentials thus minimizing flow resistance. The restraining means is compressed in response to a sudden excess pressure differential thereby permitting shut off of the valve. Unactuated, the restraining means reciprocates with the spool to assure operability in event of emergency.

REFERENCES:
patent: 2989072 (1961-06-01), Banker
patent: 3044485 (1962-07-01), Adams et al.
patent: 3770007 (1973-11-01), Orth et al.

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