Self-relieving seat and ball valve incorporating the same

Details Self-relieving seat and ball valve incorporating the same Self-relieving seat and ball valve incorporating the same

1982-01-07

1983-05-31

Schwadron, Martin P.

Valves and valve actuation

Rotary valves

Ball valve

251175, 251317, 251172, 277 75, F16K 520

Patent

active

043857477

ABSTRACT:
An annular seat for use in a ball valve has two groups of pressure relief passageways each of which extends completely through the seat between its front and rear faces. The relief passageways in one group are located adjacent the outer periphery of the seat. The passageways in the second group are located radially inward of the passageways in the first group, and extend between the rear face of the seat and a curved sealing surface on the front face of the seat. A pair of such seats are disposed in a ball valve housing adjacent opposite sides of a rotatable ball. The interior seat support surfaces in the housing have machined recesses adjacent the central axial fluid passageway through each seat, to facilitate lip flexure of the seats. The overall arrangement provides a bidirectional valve which seals on the downstream side only of the valve, and which relieves excessive cavity pressure in the valve past the upstream seat. The seats may be provided with chamfered outer rear corners to facilitate the pressure relief operation at the upstream side of the valve under conditions of extremely rapid cavity pressure generation.

REFERENCES:
patent: 2930576 (1960-03-01), Sanctuary
patent: 3488033 (1970-01-01), Priese
patent: 3556471 (1971-01-01), Paul, Jr.
patent: 4134595 (1979-01-01), Melville
patent: 4236691 (1980-12-01), Wright

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