Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1978-05-11
1979-12-25
Hoag, W. E.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264250, 264275, 264299, 264328, B29F 100, B29D 300
Patent
active
041805429
ABSTRACT:
Method for making a plug valve having a housing molded in place about a pre-formed rotary valvemember. 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 homogenous 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: 2961708 (1960-11-01), Morin
patent: 3216696 (1965-11-01), Cooley et al.
patent: 3223111 (1965-12-01), Anderson
patent: 3271845 (1966-09-01), Breher
patent: 3314644 (1967-04-01), Dwyer et al.
patent: 3394916 (1968-07-01), Birr
patent: 3712584 (1973-01-01), Wise et al.
patent: 3784155 (1974-01-01), Tomlin
patent: 3807692 (1974-04-01), Usab et al.
Celanese Corporation
Hoag W. E.
Shedden John A.
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