spool hydraulic directional control valve / pilot-operated / proportional
4WRKE

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Characteristics

  • Type:

    spool

  • Actuating method:

    pilot-operated

  • Other characteristics:

    proportional

  • Flow rate:

    3,000 l/min (793 us gal/min)

  • Operating pressure:

    350 bar (5,076 psi)

Description

Features
Pilot-operated 2-stage proportional directional valves with electrical position feedback of the main control spool and integrated electronics (OBE)
Control of flow direction and size
Proportional solenoid operation
For subplate mounting: Porting pattern according to ISO 4401
Electrical position feedback
Spring-centered main control spool
Pilot control valve: single-stage proportional directional valve
Main stage with position control

Pilot control valve type 4WRAP 6 W7.3X/G24… (1st stage)
The pilot control valve is a direct operated proportional valve. The control edge geometry has been optimized for the use as pilot control valve for proportional directional valves type 4WRKE. The proportional solenoids are pressure-tight, wet-pin DC solenoids with detachable coils. They convert the electric current proportionally into mechanical force. An increase of the current results in a correspondingly higher solenoid force. The set solenoid force will remain constant over the entire control stroke.

The pilot control valve mainly consists of the housing (1), the proportional solenoid (2 and 3), the valve control spool (4) and springs (5 and 6). In non-actuated state both actuators are connected to the tank. If one of the two solenoids (2 or 3) is excited, the magnetic force will move the valve control spool (4) towards the spring (5 or 6). After having overcome the overlap area, the connection of one of the two actuators to the tank is blocked and the connection to the pressure chamber is made. There is a flow from P to the control chamber of the main stage.