Pilot two-stage proportional directional valve with electrical position feedback and integrated electronic (OBE) control flow direction and size proportional solenoid valve operation with main control spool for baseplate mounting: port mode with electrical position feedback spring centered main control spool Pilot control valve: single stage proportional directional valve main stage with position control
The pilot control valve is a directly operated proportional valve. The control edge geometry has been optimized to be used as pilot control valves for type 4WRKE proportional directional valves. Proportional solenoid valve is a pressure resistant, wet needle DC solenoid valve with detachable coil. They convert electrical current into mechanical force in proportion. The increase in current results in a correspondingly higher solenoid force. The set solenoid valve force will remain unchanged throughout the control stroke.
The pilot control valve is mainly composed of a shell (1), proportional solenoid valve (2 and 3), valve control slide valve (4) and spring (5 and 6). In the non-actuated state, both actuators are connected to the fuel tank. If one of the two solenoid valves (2 or 3) is excited, the magnetic force will move the valve control spool (4) toward the spring (5 or 6). After overcoming the overlap area, the connection between one of the two actuators and the tank is blocked and the connection to the pressure chamber is established. There is flow from P to the main control room.
The 4WRKE valve is a two-stage proportional directional valve. They control flow and size. The main stage is position-controlled, so the position of the control spool is not affected by the flow force at high flow rates.
