Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1980-03-31
1981-08-25
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
137219, F16K 31122
Patent
active
042854954
ABSTRACT:
A safety valve having an upright tubular body with an axial opening therethrough, a portion of the opening at the lower end forming a flow passageway, the body having outlet ports extending from the flow passageway to the external cylindrical surface, an end cap closing the upper end of the axial opening, an internal stem guide within the axial opening separating the lower flow passageway from an upper cylinder and having a reduced diameter axial opening, a plunger reciprocally positioned within the flow passageway, the plunger having an upwardly extending axial stem received in the stem guide and the plunger having a seaing surface on the lower end, a seating surface within the flow passageway between the inlet ports and the open lower end of the passageway, the seating surface being engaged by the plunger sealing surface when the plunger is in the downward, valve closed, position, a piston positioned in the upper cylinder, the piston being affixed to the upper end of the plunger stem, the body having a small diameter passageway communicating between the body exterior and the cylinder above the stem guide so that fluid pressure may be applied to the small passageway to force the piston and thereby the plunger into an upper, valve open, position, and a spring normally urging the plunger into the downward, valve closed, position, so that loss of actuating fluid will cause the valve to automatically close.
REFERENCES:
patent: 2725891 (1955-12-01), De Bourguignon et al.
patent: 2759699 (1956-08-01), Rush
patent: 3086745 (1963-04-01), Natho
patent: 3260275 (1966-07-01), Armstrong et al.
patent: 3518032 (1970-06-01), De Groff et al.
patent: 3650289 (1972-03-01), Locke
patent: 4026327 (1977-05-01), Deinlein-Kalb
Schwadron Martin P.
Walton George L.
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