Fluid handling – Destructible or deformable element controlled – Destructible element
Patent
1998-09-02
1999-10-05
Walczak, David J.
Fluid handling
Destructible or deformable element controlled
Destructible element
137 67, F16K 1714
Patent
active
059608110
ABSTRACT:
A sensing valve includes a flow control member and a sensor element responsive to the presence of a substance in a flow of fluid for actuating the flow control member for stopping the flow of fluid when the substance is present in the flow of fluid. The sensing valve has a housing defining an upper region having a generally horizontal flow channel from an inlet port and a lower region having a generally vertical flow channel to an outlet port. The sensor element is disposed in the horizontal flow channel, and the flow control member is disposed in the vertical flow channel. In a preferred construction, the flow control member has a conical surface engaging with a complementary conical surface of a seat, the sensor element is seated on an internal end portion of an inlet pipe, and the sensor element and the flow control member are coupled by a shaft which protrudes from the housing through a gland threaded into the housing. The extent of protrusion of the shaft indicates whether the valve is open or closed. The sensor element can be replaced by unthreading the gland without removal of the shaft or the flow control member. The sensor element, for example, is a polystyrene cylinder that dissolves in the presence of aromatic hydrocarbon.
REFERENCES:
patent: 3472253 (1969-10-01), Herscher et al.
patent: 3491911 (1970-01-01), Fraylick et al.
patent: 3586018 (1971-06-01), Bogardh et al.
patent: 5036875 (1991-08-01), Thiltgen
"CHECK MATE.RTM. Hydrocarbon Sensing Valve Installation, Operation & Maintenance Instructions, " HMT Inc., 4422 FM 1960 West, Suite 350, Houston, Texas 77068 (12 pp.).
Oil State Industries, Inc.
Walczak David J.
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