| 摘要 |
PURPOSE:To obtain the pressure control valve with excellent responsiveness by a structure wherein a piston, which acts against a spring, is provided in an auxiliary chamber, on which input pressure acts, and a chamber formed behind the piston is connected through a pressure responding member and a throttle to a tank. CONSTITUTION:The auxiliary chamber 2, in which the input pressure applied on the pressure bearing part 4a of the pressure responding member 4 is led, is provided and the piston 14, which can retract by input pressure against the spring 13, is provided in the auxiliary chamber 12. Furthermore, the chamber 15 formed behind the piston 14 is connected through a second pressure bearing part 4b formed on the pressure responding member 4 and the throttle 16 to the tank 11. When input pressure comparatively large enough to enable to deflect a pressure spring 7 acts in a pilot circuit 6, said pressure acts on the pressure bearing part 4a so as to retract and, at that time, simultaneously acts also on the piston 14 in the auxiliary chamber 12 so that the fluid pressure generated thereby in the chamber 15 behind the piston 14 acts on the pressure bearing part 4a in such a manner as to activate the retraction of the pressure responding member 4, resulting in enabling for the pressure responding member 4 to quickly act in response to the application of the input pressure. |
