| 摘要 |
PURPOSE:To stabilize the output fluid pressure of an active system, and to facilitate the working step of air vent by utilizing a retainer for limiting the displacement of a balance piston to a necessary and satispactory value. CONSTITUTION:A control piston 11 and a control spring 14 regulate the fluid pressure in an active system (a), and a balance piston 15 exposed to an output fluid pressure chamber a2 in the active system (a) regulates the fluid pressure in a follow-up system (b). The displacement of the balance piston 15 toward the output chamber a2 of the active system is limited by a retainer 24 to a value necessary for actuating a valve 17. Therefore, the volume of the output fluid chamber a2 does not greately change, even if the actuation of the balance piston 15 is delayed due to seal resistance or the like, duly causing occurrence of overshooting, thereby the output fluid pressure is stabilized. Further, the working step of air vent is facilitated, since the balance piston 15 is prevented from pushing the control piston during the air vent work. |
