| 摘要 |
A pilot valve 10 having a control chamber 16 and pressure varying means in the control chamber 16, the pressure varying means comprising a stopper 24 which is biased to the upper end of the control chamber 16 by a spring 26. A hydraulic actuator 22 communicates with the control chamber 16, the actuator comprising a head portion 30 an and elongate stem portion 32. The stem portion 32 comprises a generally tubular threaded adaptor 34 which is fixed relative to the head portion 30, and an elongate push rod 40 which extends through, and protrudes from the outer end of, the adaptor 34. The push rod 40 is mounted for linear, telescopic movement within the tubular adaptor 34 such that the outlet pressure of the pilot valve can be adjusted by substantially solely linear movement of the actuator. <IMAGE> |
