Dual piston pneumatically operated valve

Details Dual piston pneumatically operated valve Dual piston pneumatically operated valve

1987-07-28

1988-10-11

Nilson, Robert G.

Valves and valve actuation

Fluid actuated or retarded

Piston type expansible chamber reciprocating valve actuator

92 63, 92152, 251 635, F16K 31122

Patent

active

047765623

ABSTRACT:
A gas cylinder valve for high pressure gas cylinders includes a pneumatic actuator with tandem pistons which are operated by normal industry "house" pneumatic pressures to overcome the large closing bias force generated by a set of disc springs so that the valve opening spring can lift the valve stem from its seat. A floating pressure plate which seats against an annular internal shoulder in the actuator housing prevents pneumatic pressure applied to the upper piston from acting on the back of the lower piston. Pneumatic pressure from a common source is applied to both pistons through an axial hole in a piston rod integral with one piston and bearing against the other piston. The actuator is easily assembled by merely inserting the lower piston, the pressure plate, the upper piston and the disc springs into the open end of a cup-shaped housing, and securing them in place with a preload on the springs by screwing on a housing cover.

REFERENCES:
patent: 1743620 (1930-01-01), Quiroz et al.
patent: 3387496 (1968-06-01), Broerman
patent: 3451423 (1969-06-01), Priese
patent: 3741245 (1973-06-01), West
patent: 3980270 (1976-09-01), Thomas
patent: 4112766 (1978-08-01), Ragains
patent: 4276907 (1981-07-01), Broerman
patent: 4316482 (1982-02-01), Pearce
patent: 4335744 (1982-06-01), Bey
patent: 4526341 (1985-07-01), Thomas
patent: 4706929 (1987-11-01), Kalaskie

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