초록 ▼

A normally open pilot pressure relief valve wherein the opening pressure can be readily controlled by small amounts of electrical power, which does not employ a spring, has improved pressure versus flow characteristics at both high and low pressures. The solenoid-armature magnetic circuit is so conf

A normally open pilot pressure relief valve wherein the opening pressure can be readily controlled by small amounts of electrical power, which does not employ a spring, has improved pressure versus flow characteristics at both high and low pressures. The solenoid-armature magnetic circuit is so configured that: in the designed range of valve opening movement, the magnetic force-displacement curve of the armature has a slope which increases with increasing amounts of solenoid energization. The relieved fluid flows through a longitudinal passage in the armature creating an opening flow force to compensate for the Bernoulli effect at the valve seat as the valve opens. Adjustment means are provided for accurately positioning the armature in its magnetic circuit to compensate for manufacturing tolerances.

대표청구항 ▼

An electrically controlled flow valve comprising in combination: a. a housing having an elongated cavity with a pressure inlet port at one end defined by a valve seat and an outlet port at the other end; b. a valve element having a valve seat engaging surface movable in said cavity; c. a magneticall

An electrically controlled flow valve comprising in combination: a. a housing having an elongated cavity with a pressure inlet port at one end defined by a valve seat and an outlet port at the other end; b. a valve element having a valve seat engaging surface movable in said cavity; c. a magnetically permeable armature movable in said housing; d. a solenoid coil surrounding the housing; e. said housing including a magnetically permeable armature attracting sleeve and a magnetically nonpermeable sleeve between said magnetic permeable sleeves; f. one end of said armature slightly overlapping the end of said attracting sleeve and the other end substantially overlapping the end of the supporting sleeve whereby when said solenoid is energized, the magnetic force on said armature biases said valve element relative to said valve sea;; g. an axial passage in said armature: h. threaded means between said armature and said valve element for adjusting the initial maximum overlap of the armature with the magnetically permeable attracting sleeve.