Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1992-09-24
1993-04-27
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251171, 251174, F16K 506
Patent
active
052055361
ABSTRACT:
A top entry, trunnion-type ball valve has identical, but oppositely arranged sealing assemblies on both sides of the ball. These sealing assemblies include a seal carriage that holds and maintains in position an annular body seal, an annular ball seal and a resilient O-ring interposed therebetween. The O-ring is located in a cavity between the body seal and ball seal which is open to fluid in the valve through-passage and therefore subject to high pressure in the line. Pressure in the O-ring cavity forces the ball and body seals apart and causes the O-ring to compress and resiliently urge the ball and body seals into sealing engagement with the ball and body, respectively. Angled surfaces formed on the seals enhance sealing by concentrating contact pressures.
REFERENCES:
patent: 2963262 (1960-12-01), Shafer
patent: 3445087 (1969-05-01), Priere et al.
patent: 3521855 (1970-07-01), Jensen
patent: 3819150 (1974-06-01), Kajrup
patent: 4111393 (1978-09-01), McLurg
patent: 4319734 (1982-03-01), Acar
patent: 4401292 (1983-08-01), Whaley
patent: 4511150 (1985-04-01), Soguenot
patent: 4603836 (1986-08-01), Godfrey
patent: 4606368 (1986-08-01), McCafferty
patent: 4911413 (1990-03-01), Baba et al.
Fox John C.
Newport News Shipbuilding and Dry Dock Company
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