| 摘要 |
The proportional direction pressure control valve, used in a 4 wheel steering unit of a vehicle, simplifies the structure change for changing a valve characteristics by improving a control pressure feedback. The valve comprises a main body; spools having different actuation direction and same hydraulic pressure area; a solenoid actuating the spools by an electric force; two orifices serially arranged within a spool valve to reduce the pressures of a cylinder into the hydraulic pressures of both ends of the spool, and balance the magnetic force of the solenoid with a fluid reaction force imposed on the spool.
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