Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1982-03-22
1984-05-22
Schwadron, Martin P.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251315, F16K 520
Patent
active
044496940
ABSTRACT:
The present invention relates to a ball valve having a housing with an axial passage way through the housing providing fluid communication between first and second ends of the housing. A rotatable ball is arranged within the axial passageway for selectively opening and closing the axial passageway. A seal is arranged within the axial passageway near the first end of the housing such that the seal is adapted to abut a surface on the rotatable ball. A blocking member is provided for selectively preventing axial movement of the seal towards the first end and for permitting axial movement of the seal towards the surface of the rotatable ball independently of the blocking member. In a preferred embodiment, the seal is arranged on a seal carrier which has an annular groove in an outer peripheral surface. The blocking member comprises an annular retaining ring which is threadedly secured within the axial passageway at the first end of the housing and is arranged in the annular groove in the outer peripheral surface of the seal carrier. An external diameter of the annular groove in the seal carrier is less than an internal diameter of the annular retaining ring. A connecting sleeve having a flange at one end adapted to abut a radial surface of the seal carrier selectively urges the seal carrier and the seal attached thereto into tight fitting engagement with the surface of the rotatable ball when a clamping nut is secured to an outer peripheral surface of the housing and urges the flange on the connecting sleeve into engagement with the seal carrier.
REFERENCES:
patent: 4099705 (1978-07-01), Runyan
patent: 4262688 (1981-04-01), Bialkowski
patent: 4327895 (1982-05-01), Blumenkranz
Hobart Ralph J.
Mastro Paul F.
Rupp Robert D.
Nibco Inc.
Schwadron Martin P.
Shay James R.
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