Valve construction having multiple piston means and method of ma

Fluid handling – Systems – With flow control means for branched passages

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137862, 1375991, 1375133, F16K 1518

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active

043802516

ABSTRACT:
A valve construction having a housing provided with a chamber and ports leading to the chamber and having an axially movable piston unit disposed in the chamber to interconnect certain of the ports together in relation to the axial position of the piston unit that is caused by a condition responsive device and a spring operatively associated with the piston unit, the piston unit comprising a plurality of pistons disposed in spaced substantially parallel relation and being secured together to be axially moved in unison in the chamber under the influence of the condition responsive device. The spring comprises a single coiled compression spring telescopically receiving the pistons therein, the pistons being of different lengths.

REFERENCES:
patent: 2853159 (1958-09-01), Kuhn, Jr.
patent: 3972472 (1976-08-01), Kawabata
patent: 3989058 (1976-11-01), Jackson et al.
patent: 4133349 (1979-01-01), Stripling
patent: 4147180 (1979-04-01), Steele
patent: 4228817 (1980-10-01), Weaver

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