Valves and valve actuation – Rotary valves – Ball valve
Patent
1975-02-07
1976-06-08
Weakley, Harold W.
Valves and valve actuation
Rotary valves
Ball valve
251172, 291571R, 285DIG16, 264242, F16K 500
Patent
active
039617700
ABSTRACT:
A plug valve having a housing molded in place about a pre-formed rotary valve member. The rotary valve member is molded with the mold parting lines lying in a plane containing the axis of the flow passageway. Around the passageway orifice, the mold parting line is eliminated by use of a core insert which forms a recessed region with an annular mold parting line spaced from the orifice. The housing includes a body portion which surrounds the rotary valve member and an annular lip seal member formed as a homogeneous part of the body portion and extending inwardly adjacent the recessed region of the valve member. The inwardly extending portion of the lip seal member has the property of flexing to form a fluid-tight seal when the valve member is in its closed position. On valves having non-threaded end sockets, an annular reservoir is provided between the lip seal member and the socket portion to prevent solvent or cement from contacting the lip seal member when the valve is connected to a pipeline by use of solvent welding.
REFERENCES:
patent: 2825587 (1958-03-01), Barta
patent: 3223111 (1965-12-01), Anderson
patent: 3271845 (1966-09-01), Breher
patent: 3540693 (1970-11-01), Wise
patent: 3698687 (1972-10-01), Kitamura
patent: 3712584 (1973-01-01), Wise
patent: 3807692 (1974-04-01), Usab
Bressler Marvin
Celanese Corporation
Grim Linn I.
Morgan T. J.
Weakley Harold W.
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