Fluid handling – Convertible – Reversible check
Patent
1981-12-08
1983-12-13
Schwadron, Martin P.
Fluid handling
Convertible
Reversible check
13762566, 251 62, 92 62, F16K 31122
Patent
active
044200110
ABSTRACT:
A pilot valve is disclosed having a piston actuating a valve element shiftable between a first and second positions. The piston is comprised of two concentrically arranged pistons, the larger piston having an internal bore with two sections of staggered diameters and a smaller, correspondingly shaped second piston inserted in the concentric internal bore. A single O-ring on the bottom of the second section of the first piston annularly mounted around the second section of the second piston seals the piston chamber from a fluctuating sensed fluid pressure. The first piston has a longer upper bore section than the second piston. A spacer is placed at the juncture of the first and second sections of second piston so as to enable the first and second piston to act in unison in actuating the valve element. In this mode, the effective surface area of the piston is equal to the diameter of the larger piston or of the O-ring. When the spacer is removed, the second piston is enabled to act independently of the first piston. Therefore, the effective surface area of the piston in this mode is equal to the cross sectional area of the second piston only and the pressure required to influence the position the valve element opposed by a single spring is increased. Thus two discrete ranges are enabled for the pilot valve as herein disclosed determined by the presence or absence of the spacer.
REFERENCES:
patent: 4073466 (1978-02-01), Snyder
patent: 4084613 (1978-04-01), Peters
patent: 4217934 (1980-08-01), Peters
Matthews Guy E.
Schwadron Martin P.
Shay James R.
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