| 摘要 |
A pilot piston controls the connection between a hydraulic fluid inlet passage and an outlet passage, on the one hand, and a control passage, on the other, the control passage being connected to a servo piston that operates the control element of a hydraulic machine. The control passage has a pressure regulating valve, a compensating piston being moved in response to any pressure difference across the pressure regulating valve. A follow-up lever coupled to the pilot piston moves the latter in response to any movement of the compensating piston so as to return the pilot piston to the neutral position.
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