Reciprocating expandable gate valve

Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction

Patent

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Details

251195, 251204, 251326, 13724622, F16K 2500

Patent

active

044051131

ABSTRACT:
A valve body includes flow passageways across which a gate is movable with the gate having a central block sandwiched between outer seal blocks and a gate conduit alignable with the flow passageways of the valve body. Camming means along the edges of opposite faces of the central gate block cooperate with camming means on the seal blocks so that relative vertical movement between the central gate block and the seal block causes the seal blocks to expand outwardly into sealing contact with seal means on the ends of the passageway facing the gate. A main stem moves the entire gate as a unit with a coaxial cam drive shaft in the main stem having first and second oppositely threaded sections respectively engaged with the main stem and the central gate block to rapidly effect vertical movement of the central gate block upon rotation of the cam drive shaft. In the preferred embodiment roller members are positioned between the cam surfaces of the central gate block and the seal blocks with planar cam to cam surfaces being provided in alternative embodiments.

REFERENCES:
patent: 600181 (1898-03-01), Smith
patent: 1134811 (1915-04-01), Berger
patent: 1769386 (1930-07-01), Orton
patent: 2326988 (1943-08-01), Wilson
patent: 2711877 (1955-06-01), Doster
patent: 3319661 (1967-05-01), Shindler
patent: 4291862 (1981-09-01), Alvarez
patent: 4314579 (1982-02-01), Wheatley

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