| 摘要 |
An electro-hydraulic proportional control valve includes an electro-hydraulic pilot valve, an inlet pressure reducing valve, and a directional control valve. The electro-hydraulic pilot valve receives an electrical input signal and provides a hydraulic signal to the directional control valve in response to the electrical signal. The inlet pressure reducing valve modulates fluid flow from a pump to the directional control valve to maintain a constant pressure drop across the directional control valve under all conditions. The directional control valve includes a directional control valve spool which shifts between a neutral position, a leftward displaced position, and a rightward displaced position in response to the hydraulic signal from the electro-hydraulic pilot valve. The directional control valve spool includes a range adjustment device for adjusting and setting the flow rate through the directional control valve.
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