Sealed Power Corporation

Spx Corporation

John L Hendrixon

David J Domanchuk

Allen F Pearson

Robert R Rositch

A solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnetic variable force motor is mounted on the valve body and includes a housing of ferromagnetic construction with a pole piece of ferromagnetic construction coaxial with the valve spool and surrounded by an electrical coil. An armature comprising a ball of ferromagnetic construction is positioned coaxially with the pole piece in abutting engagement with the valve spool. A coil spring is positioned to engage the ball-armature and to urge the same axially away from the pole piece. The characteristic of magnetic attraction between the ball-armature and the opposing face of the pole piece as a function of separation therebetween is substantially identical with spring rate, both preferably being a linear function of ball-armature displacement.

Electromagnetic solenoid valve with variable force motor

An electrohydraulic control system comprising a spool valve including a body having a bore. A spool is positioned in the bore for reciprocating movement within the bore. The valve body has an inlet, an outlet and an exhaust port. An electrohydraulic three-way normally closed pulse width modulated valve has an inlet communicating with the inlet to the valve body and an outlet communicating with one end of the spool. An electrohydraulic three-way normally closed ON/OFF valve has an inlet communicating with the outlet of the body and an outlet communicating with the other end of the spool. A spring yieldingly urges the spool toward the pulse width modulated valve. The spool is positioned so that it normally obstructs a path from the inlet to the outlet.

Electrohydraulic control of a spool valve for energizing a heavy duty

A parted annular piston sealing ring and a method for manufacture thereof wherein an inwardly facing ring surface adapted to be engaged by an expander-spring for expanding the ring into sealing engagement with a cylinder wall is hardened in a zone immediately adjacent the parted ring tips. Hardening of the spring-engaging surface at the ring tips reduces wear and embedment between the ring and spring in the region of the ring gap while permitting resilient flexure of the ring in regions removed from the ring gap to follow surface variations in a cylinder wall.

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Shelby, MI, United States of America

John L Hendrixon