Ball valve seat assembly having a removably mounted face seal in

Details Ball valve seat assembly having a removably mounted face seal in Ball valve seat assembly having a removably mounted face seal in

1977-07-20

1978-09-05

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251315, 251317, F16K 2500

Patent

active

041113934

ABSTRACT:
A ball valve seat assembly has a seat ring with an annular recess around an inner annular portion thereof and a resilient seat ring insert mounted in the recess. The seat ring has a radially outwardly extending groove located within the recess. The insert has a radially outwardly extending retaining flange which is engaged in the seat ring groove to anchor the insert. The insert is sufficiently deformable to be radially inwardly deformed temporarily as the flange is moved through the interior of the seat ring and into the groove. The insert has a face portion that is sealingly engaged with the ball valve member. The seat ring and the insert are biased toward the ball valve member and a peripheral seal is provided around the seat ring to seal with the valve body. The seat pocket inner side extends in an overlying relation to a portion of the insert in order to prevent radially inward movement of the insert. In one construction an O-ring is compressed in the seat pocket against the seat ring and the insert to urge them toward the valve member and to seal around the seat ring. In another construction an O-ring seal is provided around the perimeter of the seat ring and springs are used to bias the seat member toward the ball valve member.

REFERENCES:
patent: 2466098 (1949-04-01), Grebmeier
patent: 2529412 (1950-11-01), Parker
patent: 3293342 (1966-12-01), Grove
patent: 3472270 (1969-10-01), Masheder

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