| 摘要 |
<p>A two-way reversible-flow hydraulic control valve is disclosed which comprises a chamber (9), pressurized so as to urge a plunger (1) into the closed position, and connected via first and second passages (5, 6) with relative integral check valves (5b, 6b) to respective first and second ports (A, B). The valve also comprises an unloading passage opened or blocked by a solenoid operated needle (4) in order to maintain or relieve pressurized conditions in the chamber; with the unloading passage opened up, pressure through the inlet unseats the plunger, thereby allowing flow of fluid from the pressure port to the exhaust port.</p> |
