| 摘要 |
<p>PURPOSE:To completely offset the energizing force of a balance piston by that of a control piston, dissolve entangling force affecting a pintle and support the pintle under a static pressure well-balanced condition by providing the balance piston for energizing the pintle forward and backward. CONSTITUTION:A pair of right and left cylinder bores 20a are drilled in the end face to energize pintle 2 forward, where spaced a distance l apart from the center line (b) of a control piston 10 in the Z direction, and fittedly mounted with a balance piston 20b to form a forward-side auxiliary actuator 20. Also, a pair of right and left cylinder bores 21a are drilled in the end face to energize the pintle 2 backward and fittedly mounted with a balance piston 21b to form a backward-side auxiliary actuator 21. A flow passage 23 is provided for the forward-side auxiliary actuator 20 so as to introduce equivalent pressure in synchronization with a backward-side actuator 8, and a flow passage 22 is provided for the backward-side auxiliary actuator 21 so as to introduce equivalent pressure in synchronization with a forward-side actuator 7.</p> |
