| 摘要 |
PURPOSE:To prevent the occurrence of galling between each of members during operation, by constituting a transmission gear, transmitting the operation of an actuator to a pilot valve, with a flexible member. CONSTITUTION:When a drum 19b is rotated in an arrow direction by an actuator, a wire 18 is hoisted up, whereby a pilot valve 14 goes up against a spring 16, and a valve plate 14a comes off a valve seat 12e at the upper end of a cylindrical part 12d at the inner side. If so, the fluid that flowed in a hydraulic chamber 6 from a fluid inflow port 11a by way of a passage 11d flows out to a fluid outflow port 11b from the valve seat 12e. Accordingly, pressure in the hydraulic chamber 6 drops to some extent, while a main valve member 12 goes up against a spring 15, and the fluid flows in the outflow port 11b from the inflow port 11a. With this constitution, a possibility of any galling among all members during operation may no longer happen there. |
