Importance

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Abstract

A flow regulator which is capable of suppressing hysteresis and includes a housing which includes a fluid inlet port, a fluid outlet port and a valve seat positioned in a communication channel, through which the fluid inlet port and the fluid outlet port are communicatively connected; a plunger guide cylinder coupled to the housing; a plunger provided at an end thereof with a valve body which moves toward and away from the valve seat, the plunger being inserted into the plunger guide cylinder to be freely movable in an axial direction; a spring which biases the plunger in a direction to bring the valve body into contact with the valve seat; and an electromagnetic device which moves the plunger in a valve opening direction against the spring. A clearance exists between an outer periphery of the plunger and an inner periphery of the plunger guide cylinder, the clearance being sufficient for the outer periphery of the plunger and the inner periphery of the plunger guide cylinder to be completely in noncontact with each other, to thereby make a sliding resistance therebetween zero in a state where axes of the plunger and the plunger guide cylinder are aligned. The valve body is formed as a ball, and one and the other of the valve body and the valve seat are made of a rigid body and an elastic material, respectively. The spring is a compression coil spring which is concentric with the plunger and is provided in an extended state between a fixed portion of the plunger guide cylinder and a movable portion on the plunger side.

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First Claim