Valves and valve actuation – Reciprocating valve – Gate
Patent
1979-10-22
1981-08-04
Schwadron, Martin P.
Valves and valve actuation
Reciprocating valve
Gate
251282, 251284, F16K 302
Patent
active
042818192
ABSTRACT:
A balanced stem gate valve incorporating a slab gate having hard friction resistant sealing face surfaces that cooperate with friction resistant seat assemblies to provide for low operating torque under high pressure conditions. Seat carrier rings are supported within the valve chamber and define seal recesses within which are retained a metal back-up seal ring and a hard friction resistant face sealing ring that is compatible with the sealing surface material of the gate. Metal-to-metal back sealing is provided between the stem and bonnet and between the pressure balancing stem and the valve body structure, depending upon the position of the reversable gate member. As an alternative, a gate valve construction is provided with substantial pressure balancing capability through incorporation of a closed, non-vented balancing chamber incorporating a balancing stem that is internally bored so as to cooperate with the balancing chamber and define a large volume chamber that establishes a low compression ratio as the pressure balancing stem is inserted into the pressure balancing chamber. Packing assemblies are provided, the sealing ability of which can be enhanced by injection of sealant material between packing rings.
REFERENCES:
patent: 2889134 (1959-06-01), Bryant
patent: 3269692 (1966-08-01), Shafer
patent: 3270772 (1966-09-01), Rakus
patent: 3314442 (1967-04-01), Volpin
patent: 3533598 (1970-10-01), Tillman
patent: 3575380 (1971-04-01), Siver
patent: 4029294 (1977-06-01), McCaskill et al.
patent: 4124194 (1978-11-01), Alvarez et al.
Schwadron Martin P.
Spiegel H. Jay
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