Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1985-11-21
1987-02-17
Cohan, Alan
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251175, 251195, 251327, 251328, F16K 316
Patent
active
046433953
ABSTRACT:
A gate valve 10 of slab gate variety with "floating" seats having means for protecting the seat ring seals and seat pockets in severe operating conditions. Each seat ring (40,41) is provided in its rear face (43,44) with an annular groove (49) coaxial with the ring axis and of a diameter to be located closely adjacent the flow passage (16,17) through the valve and accommodating an O-ring seal (49,50) therein. A second annular groove (51) is formed in the outer cylindrical surface (40a, 41a) of the ring near the front face (43,44) of the ring and accommodates an O-ring seal therein. The two O-ring seals (49,52) and (50,51) by their location establish a "trapped" volume chamber (55) behind the seat ring and seat pocket (32,33) which protects and isolates the seat pocket from corrosive ladings and solids deposition. Each seat ring is provided with an unobstructed "bleed" passage (56) which extends from the front face of the ring to the rear face of the ring or other locations so as to open to the "trapped" chamber whereby excessive pressure "build-up" in the "trapped" chamber as could damage the seat ring and seals or impair valve operation is precluded.
REFERENCES:
patent: 3078865 (1963-02-01), Estes et al.
patent: 4067542 (1978-01-01), Morrison
patent: 4179098 (1979-12-01), Laitkep et al.
patent: 4434967 (1984-03-01), Vanderburg
Cohan Alan
Joy Manufacturing Company
Marnock Marvin J.
Starsiak Jr. John S.
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