| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow control valve in which slide resistance of a valving element is reduced as much as possible and durability of a seal member is prevented from being deteriorated.SOLUTION: In the flow control valve, a seal member 23 is mounted to a rear end side outer periphery of a valving element 2, a cylindrical stationary housing 4 is provided so as to cover a rear end side of the valving element 2, and a back pressure chamber 3 that is surrounded by an inner peripheral surface of the stationary housing 4 and a rear end surface of the valving element 2 is communicated to a secondary chamber 14 of a valve port 12. A rear part of the inner peripheral surface of the stationary housing 4 has a diameter that is expanded more than that of a front part thereof so as to reduce the pressure of the seal member 23 coming into press-contact with the inner peripheral surface of the stationary housing 4 while the valve port 12 is opened to a predetermined opening degree or more by retreating the valving element 2. |
