Classification of solenoid valves
date：2023-09-21
(1) Direct acting solenoid valve:
Principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing part against the valve seat, causing the valve to close.
Features: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.
(2) Step by step solenoid valve:
Principle: It is a combination of direct action and pilot type principle. When there is no pressure difference between the inlet and outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closure part upwards after being energized, and the valve opens. When the starting pressure difference between the inlet and outlet is reached, after being energized, the electromagnetic force leads the small valve, causing the pressure in the lower chamber of the main valve to increase and the pressure in the upper chamber to decrease, thereby using the pressure difference to push the main valve upwards; When the power is cut off, the pilot valve uses spring force or medium pressure to push the closing element downwards, causing the valve to close.
Features: It can also operate at zero pressure difference, vacuum, and high pressure, but with high power, it is required to be installed horizontally.
(3) Pilot operated solenoid valve:
Principle: When energized, electromagnetic force opens the pilot hole, causing a rapid decrease in pressure in the upper chamber, creating a high and low pressure difference around the closing element. Fluid pressure pushes the closing element upwards, causing the valve to open; When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly forms a pressure difference of low to high around the closing valve through the bypass hole. The fluid pressure pushes the closing valve downward to close the valve.
Features: The upper limit of the fluid pressure range is high, and can be installed arbitrarily (customized), but the fluid pressure difference condition must be met.
2. Electromagnetic valves are divided into six sub categories based on differences in valve structure, material, and principle: direct acting diaphragm structure, step-by-step direct acting diaphragm structure, pilot diaphragm structure, direct acting piston structure, step-by-step direct acting piston structure, and pilot piston structure.
3. Electromagnetic valves are classified according to their functions: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low-temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high-pressure solenoid valve, explosion-proof solenoid valve, etc.
Principle: When energized, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat, and the valve opens; When the power is cut off, the electromagnetic force disappears, and the spring presses the closing part against the valve seat, causing the valve to close.
Features: It can work normally under vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.
(2) Step by step solenoid valve:
Principle: It is a combination of direct action and pilot type principle. When there is no pressure difference between the inlet and outlet, the electromagnetic force directly lifts the pilot small valve and the main valve closure part upwards after being energized, and the valve opens. When the starting pressure difference between the inlet and outlet is reached, after being energized, the electromagnetic force leads the small valve, causing the pressure in the lower chamber of the main valve to increase and the pressure in the upper chamber to decrease, thereby using the pressure difference to push the main valve upwards; When the power is cut off, the pilot valve uses spring force or medium pressure to push the closing element downwards, causing the valve to close.
Features: It can also operate at zero pressure difference, vacuum, and high pressure, but with high power, it is required to be installed horizontally.
(3) Pilot operated solenoid valve:
Principle: When energized, electromagnetic force opens the pilot hole, causing a rapid decrease in pressure in the upper chamber, creating a high and low pressure difference around the closing element. Fluid pressure pushes the closing element upwards, causing the valve to open; When the power is cut off, the spring force closes the pilot hole, and the inlet pressure quickly forms a pressure difference of low to high around the closing valve through the bypass hole. The fluid pressure pushes the closing valve downward to close the valve.
Features: The upper limit of the fluid pressure range is high, and can be installed arbitrarily (customized), but the fluid pressure difference condition must be met.
2. Electromagnetic valves are divided into six sub categories based on differences in valve structure, material, and principle: direct acting diaphragm structure, step-by-step direct acting diaphragm structure, pilot diaphragm structure, direct acting piston structure, step-by-step direct acting piston structure, and pilot piston structure.
3. Electromagnetic valves are classified according to their functions: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low-temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high-pressure solenoid valve, explosion-proof solenoid valve, etc.