In order to control stably. the inner air should be exhausted thorough
and the solenoid core should be filled with oil. The vent of solenoid should be loosed gradually for purpose of drain. the air to the full. there are three vets in the solenoid and you can choose the upside vent so that the air can be expelled more easily.
1. This kind of valve only supply the minimum pressure that the driving
components need and flow of inlet throttle type energy saving valve.
2. This kind of valve can make the pressure of oil pumping side maintains
differential pressure 0.6-0.9MP a greater than load pressure so that can safe energy.