Self-restricting shutoff valve

Details Self-restricting shutoff valve Self-restricting shutoff valve

1979-12-12

1981-06-02

Cline, William R.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

251 27, 137413, F16K 3134

Patent

active

042705665

ABSTRACT:
A self-restricting shutoff valve for use with a fluid leak detector to prnt excessive loss of fluid in event of a high flow-rate leak. A valve spool within a valve body is spring-biased to a partial flow position and is maintained in an opened position by fluid pressure. Upon loss of fluid system pressure, springs move the valve spool to a position to restrict fluid flow through the valve body. When sufficient loss of fluid occurs, a fluid leak detector actuates a pilot valve so that system fluid moves the valve spool to a closed position.

REFERENCES:
patent: 730951 (1903-06-01), Mumford et al.
patent: 1488878 (1924-04-01), Heath
patent: 3363412 (1968-01-01), Fischer et al.
patent: 3891182 (1975-06-01), Schwerin
patent: 4119016 (1978-10-01), Pfeil et al.

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