Flow control valve.

摘要

A flow control valve having a sleeve formed with an inlet port and an outlet port and a spool slidably mounted in the sleeve. A fluid passage is provided having an orifice and connecting a high-pressure end and a low-pressure end of the spool. An annular seal is liquid-tightly fitted in an annular groove formed in the inner periphery of the sleeve and fitted in an annular groove formed in the outer periphery of the spool with a gap left therebetween. A biasing means is provided to bias the spool in a direction opposite to the fluid pressure differential between both ends of the spool. A sealing portion is formed by the annular seal and a shoulder portion of the outer peripheral groove to open and close fluid communication from the inlet port toward the outlet port through the orifice with the movement of the spool. <IMAGE>