Directional valves of type WE are solenoid-actuated directional spool valves. They control the start, stop and direction of a flow.
The directional valves basically consist of the housing (1), one or two solenoids (2), the control spool (3), and one or two return springs (4).
In the de-energized condition, the control spool (3) is held in the central position or in the initial position by the return springs (4) (except for impulse spools). The control spool (3) is actuated by wet-pin solenoids in hydraulic fluid (2).
To ensure proper functioning, make sure that the pressure chamber of the solenoid is filled with hydraulic fluid.
The force of the solenoid (2) acts via the plunger (5) on the control spool (3) and pushes the latter from its rest position to the required end position. This enables the necessary direction of flow from P → A and B → T or P → B and A → T.
After de-excitation of the solenoid (2), the return spring (4) pushes the control spool (3) back to its rest position.
A manual override (6) allows control spool (3) to be moved without solenoid energization.
Without spring return “O” (only possible with symbol D)
This version is a directional valve with two spool positions and two solenoids without detent. In the de-energized condition, there is no defined spool position.
Without spring return, with detent “OF" (Impulse spool, only possible with symbol D)
This version is a directional valve with two spool positions, two solenoids and one detent.
It alternately locks the two spool positions and the solenoid therefore does not need to be permanently energized.
For design reasons, internal leakage, which may increase over the life cycle, is inherent to the valves.
Type 4WE 6 E5X/.B..NVP1Z2
Throttle insert "...B"
The use of a throttle insert is required when, due to prevailing operating conditions, flows occur during the switching processes, which exceed the performance limit of the valve.