Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1981-01-05
1983-06-07
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251174, 251315, 251316, F16K 3500
Patent
active
043867561
ABSTRACT:
The invention is an improved self-centering, floating metal seal to be used in combination with a ball valve which controls the flow of fluid in a conduit. The ball valve includes a valve body which has a bore extending therethrough and which also has an inlet and an outlet which are axially aligned and adapted to be mechanically coupled to the conduit. The valve body also has an aperture therein. The ball valve also includes a spherical valve member having a port the axis of which is alignable with the axis of the bore of the valve body and a stem having an inner end mechanically coupled to the spherical valve member and an axially outer end which extends through the aperture of the valve body. The ball valve further includes a device for forming a seal between the aperture of the valve body and the stem. The improved self-centering, floating metal seal includes a metal ring which has a planar surface and a contoured surface which is adapted to contact the spherical surface of the valve member and which is axially aligned with the bore of the valve body and is disposed adjacent to the spherical valve member. The seal also includes a metal piston which has a first planar surface which is disposed adjacent to the planar surface of the metal ring and a second planar surface. There is a difference in the dynamic sealing areas of the piston and metal ring so that the upstream pressure mechanically seals the ball valve.
REFERENCES:
patent: 3154094 (1964-10-01), Bredtschneider
patent: 3164362 (1965-01-01), Lavigueur
patent: 3508736 (1970-04-01), Rhodes
patent: 3732885 (1973-05-01), Allen
patent: 4099705 (1978-07-01), Runyan
Valve Concepts International
Weakley Harold W.
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