Interruption valve with automatic reset

Details Interruption valve with automatic reset Interruption valve with automatic reset

2007-05-15

2007-05-15

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

C137S464000, C137S494000

Reexamination Certificate

active

11015920

ABSTRACT:
A fluid valve (10) that interrupts the flow of fluid when backpressure ceases. The valve (10) consists of a valve body (20) having an inlet (22), an outlet (24), a piston chamber (32), and a backpressure port (34). The port (34) is located between the outlet (24) and the chamber (32), and a stem bore (36) is disposed within the valve body (20) between the chamber (32), and the inlet (22) and the outlet (24). A piston (40) that includes a restricting stem (42), is confined within the chamber (32) and the stem (42) is positioned within the stem bore (36). The stem (42) restricts fluid flow when there is no backpressure, but when backpressure exists the stem (42) is forced away from the inlet (22) and the outlet (24) by the piston (40) thereby permitting a full flow through the valve (10). An adjustable compression spring (68) engages the piston (40) urging the stem (42) into the stem bore (36) when no backpressure exists. The valve (10) automatically restores full fluid flow when sufficient fluid backpressure is re-established.

REFERENCES:
patent: 745002 (1903-11-01), Devers et al.
patent: 854047 (1907-05-01), Leber
patent: 1615776 (1927-01-01), Slater
patent: 2304404 (1942-12-01), Flanagan
patent: 3792714 (1974-02-01), Miller
patent: 5860446 (1999-01-01), Hunt

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