Half-turn valve

Details Half-turn valve Half-turn valve

1985-09-23

1986-07-01

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251161, 251188, F16K 2500

Patent

active

045975604

ABSTRACT:
A plug valve assembly employs a stem having a threaded end, and a shiftable locking key to alternatively interengage the plug with either the stem or the bonnet. When the plug is locked to the bonnet by the key, the threaded part of the shaft will initially lift it from its seat; shifting the key will permit the plug to be rotated by the shaft to open the valve, and the interengagement established by the key will enable return of the plug to orient it for closure.

REFERENCES:
patent: 912890 (1909-02-01), Roberts
patent: 2711302 (1955-06-01), McWhorter
patent: 4231440 (1980-11-01), Erwin
patent: 4450732 (1984-05-01), Lew

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