Patent ID: 6269827
Filing Date: 2001-08-07
Classification: F15B,G05D,Y10T

Abstract:
A solenoid operated pressure control valve comprising:(a) a valve body having a straight bore therein with an inlet port, an exhaust port, and a control outlet port disposed in axially spaced arrangement in said bore;(b) a valve spool disposed in said bore for axial movement therein and having (i) a first annular surface thereon closely fitting said bore and disposed adjacent said inlet port, (ii) a second annular valving surface thereon closely fitting said bore and disposed adjacent said exhaust port and spaced from said first annular valving surface, and (iii) a recessed portion intermediate said first and second annular valving surface, said recessed portion in continuous communication with said pressure control port;(c) a first fluid chamber disposed at a first end of spool and a first metering passage formed in said spool communicating said first fluid chamber with said recess;(d) a second fluid chamber disposed at a second end of said spool opposite said first end and a second metering passage formed in said spool communicating said second fluid chamber with said recess;(e) an elongated member having an end thereof attached to and extending from said first end of said spool, said member having an end opposite said attached end extending through said body externally of said bore in sliding sealed arrangement, said member thereby reducing the surface area of said spool end exposed to pressure in said first fluid chamber; and(f) a solenoid disposed to have the armature thereof contacting said externally extending end of said elongated member wherein said solenoid, upon energization is operable to move said spool to increase flow from said inlet to said recess and decrease flow from said recess to said exhaust port.