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Principles of Parker stepper direct acting and pilot operated solenoid valvesRelease Date: November 23, 2017
Parker stepper direct acting solenoid valve:
Principle: It is a combination of direct-acting and pilot-operated principle. When there is no pressure difference between the inlet and the outlet, after the power is applied, the electromagnetic force directly lifts the pilot small valve and the main valve closing part in turn, and the valve opens. When the inlet and outlet reach the starting pressure difference, after the power is turned on, the electromagnetic force pilots the small valve. The pressure in the lower chamber of the main valve rises, and the pressure in the upper chamber decreases, so that the main valve is pushed upward by the pressure difference. Force or media pressure pushes the closing piece and moves down to close the valve.
Features: It can operate under zero pressure difference, vacuum or high pressure, but the power is large, and it must be installed horizontally.
Parker pilot operated solenoid valve:
Principle: When power is applied, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference between the upper and lower parts is formed around the closing member. The fluid pressure pushes the closing member to move upward and the valve opens. The hole is closed, and the inlet pressure passes through the bypass hole to quickly form a lower and upper pressure difference around the valve closing member. The fluid pressure pushes the closing member to move downward and closes the valve .
Features: The upper limit of the fluid pressure range is high, which can be arbitrarily installed (customized) but must meet the fluid pressure differential conditions.