Directional valves type SEC are solenoid-actuated directional seat valves. They control the start, stop and direction of a flow.
The directional valves basically consists of a housing, the electronic solenoids, as well as the hardened valve system.
It is to be ensured that the maximum flow indicated is not exceeded. If necessary, a screw-in throttle has to be used for flow limitation (see below).
Depending on the production tolerances, a pump or tank pre-opening of the valve occurs. For this reason, for valves of the same type, different pressure gradients can occur during the switching process.
One valve alone may not be used for holding loads or positions.
Check valve insert
The check valve insert in P enables a free flow from P to A/B and closes the flow from A/B to P.
The check valve insert in T enables a free flow from A/B to T and closes the flow from T to A/B.
Screw-in throttle
The use of a screw-in throttle is required if, due to prevailing operating conditions, flows which exceed the performance limit of the valve can occur during the switching processes.
Examples:
- Accumulator operation,
- Use as pilot control valve with internal pilot fluid tapping.
For available screw-in throttles and check valve insert, refer to “Accessories”.
| 1 | Screw-in throttle |
| 2 | Check valve insert |
| 3 | Check valve insert |