Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1983-11-14
1986-01-28
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251167, 251174, 251203, F16K 2500
Patent
active
045666717
ABSTRACT:
A gate valve is disclosed having a secondary seal, wherein the gate forms a metal to metal seal with the seat and wherein a resilient seal is moved toward the gate in a closed position to form a secondary fluid-tight seal with the gate. A device for deenergizing the secondary seal is provided in order to prevent wear of the secondary seal upon opening of the gate and also to reduce the gate drag caused by the energized secondary seal. Also disclosed is a pressure relief mechanism for the secondary seal adapted to prevent damage to the seal and a mechanism for evenly applying opposing secondary seals.
REFERENCES:
patent: 1692496 (1928-11-01), Frob
patent: 2134277 (1938-10-01), Sproull
patent: 2203989 (1940-06-01), Hamer
patent: 2471941 (1949-05-01), Downey
patent: 2776813 (1957-01-01), Blackman
patent: 2800926 (1952-07-01), Handley
patent: 3033237 (1962-05-01), Belford
patent: 3472270 (1969-10-01), Masheder
patent: 3557822 (1971-01-01), Chronister
patent: 4290580 (1981-09-01), Balhouse
Ostfeld David M.
Weakley Harold W.
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