In principle, solenoid valves are divided into three categories:
1) Direct-acting solenoid valve:
Principle: When the electromagnetic pulse valve is energized, the electromagnetic coil generates electromagnetic force to lift the closing member from the valve seat, and the valve opens; when the power is off, the electromagnetic force disappears, and the spring presses the closing member on the valve seat, and the valve closes.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.
2) Solenoid pulse valve distributed direct-acting solenoid valve:
Principle: It is a combination of direct action and pilot type. When there is no pressure difference between the inlet and the outlet, after the power is turned on, the electromagnetic force directly lifts the pilot small valve and the main valve closing member upwards in turn, and the valve opens. When it reaches the starting pressure difference with the outlet, after the power is turned on, the electromagnetic force pilots the small valve. The medium pressure pushes the closing piece and moves downward to close the valve.
Features: It can also operate under zero pressure difference or vacuum and high pressure, but the power is large, and it must be installed horizontally.
3) Solenoid pulse valve pilot solenoid valve:
Principle: When the power is turned on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a high pressure difference is formed around the closing part. The fluid pressure pushes the closing part to move upward, and the valve opens; when the power is off, the spring force controls the pilot The hole is closed, and the inlet pressure passes through the bypass hole to quickly form a low and high pressure difference around the valve closing member. The fluid pressure pushes the closing member to move downward and close the valve.
Features: The upper limit of the fluid pressure range is high, and it can be installed arbitrarily (customization is required) but must meet the fluid pressure difference conditions.
- The electromagnetic pulse valve is divided into six branches from the difference in valve structure and material and the difference in principle. kind:
Direct-acting diaphragm structure, step-by-step structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, pilot piston structure
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