Valve assembly

Details Valve assembly Valve assembly

1977-01-21

1978-02-14

Nilson, Robert G.

Fluid handling

Systems

Sequentially progressive opening or closing of plural valves

91 48, F16K 100

Patent

active

040733157

ABSTRACT:
A valve assembly with decompression means having a valve body with a pressure port, a return port and a control port with internal passages connecting the ports, and a pair of valves within said body arranged in parallel and operable when closed to block the flow from the control port to the return port, the valves being operable in sequence with a first of the valves openable to slowly reduce the pressure in said internal passages and the second valve being openable thereafter to permit a substantial flow from the control port to the return port. A force-multiplying system includes plural levers and a relatively heavy spring with the spring normally holding the first valve closed whereby actuation of the force-multiplying system causes the application of a force against the relatively heavy spring to permit fluid pressure to open the first valve to reduce the pressure and with the second valve and the spring being related whereby a reduction of pressure in the internal passages to a certain level causes said spring to open the second valve.

REFERENCES:
patent: 2073751 (1937-03-01), Niesmann
patent: 2381553 (1945-08-01), Mott
patent: 3631893 (1972-01-01), Seaman
patent: 3934610 (1974-05-01), Solie

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