What category does a Pneumatic solenoid valve belong to? A brief description of the types of Pneumatic solenoid valves
What category does a Pneumatic solenoid valve belong to
A pneumatic solenoid valve is an industrial device controlled by electromagnetism and is a fundamental component for the automation of fluid control. It belongs to the actuator and is not limited to hydraulic and pneumatic ones. It is used in industrial control systems to adjust parameters such as the direction, flow rate, and speed of the medium. Solenoid valves can be combined with different circuits to achieve the expected control, ensuring the accuracy and flexibility of the control. There are many types of solenoid valves. Different solenoid valves play roles at different positions in the control system. The most commonly used ones include check valves, safety valves, directional control valves, speed control valves, etc.
Solenoid valves are pneumatic components and belong to the category of instrument equipment, not electrical equipment. In various manufacturers, they are all under the jurisdiction of the instrument department, and the electrical department does not manage solenoid valves.
A brief description of solenoid valve types
1. Direct-acting solenoid valve
Principle: When powered on, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, opening the valve. When the power is cut off, the electromagnetic force disappears, and the spring presses the closing member onto the valve seat, closing the valve.
Features: It can operate normally under vacuum, negative pressure and zero pressure conditions, but the diameter of the passage generally does not exceed 25mm.
Ii. Step-by-step direct-acting Solenoid valve
Principle: It is a combination of direct-acting and pilot-operated principles. When there is no pressure difference between the inlet and the outlet, upon energification, the electromagnetic force directly lifts the pilot small valve and the main valve closure member upward in sequence, opening the valve. When the inlet and outlet reach the starting pressure difference, after being powered on, the electromagnetic force operates the small valve. The pressure in the lower chamber of the main valve rises and the pressure in the upper chamber drops, thereby using the pressure difference to push the main valve upward. When power is cut off, the pilot valve uses the spring force or the medium pressure to push the closing member downward, thus closing the valve.
Iii. Pilot-operated Solenoid Valve
Principle: When powered on, the electromagnetic force opens the pilot hole, causing the pressure in the upper chamber to drop rapidly. This creates a pressure difference with a lower top and a higher bottom around the closing member. The fluid pressure pushes the closing member upward, opening the valve. When the power is cut off, the spring force closes the pilot hole. The inlet pressure rapidly forms a pressure difference with a lower bottom and a higher top around the closing member through the bypass hole. The fluid pressure pushes the closing member downward to close the valve.
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