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Various types of Shanghai solenoid valve and how to choose correctly?
First, the first: direct-acting solenoid valve
The principle is: when the power is applied, the electromagnetic coil will generate electromagnetic force to lift the closing member from the valve seat, and the valve will be opened; when the power is off, the electromagnetic force disappears, and the spring presses the closing member on the valve seat. The valve will close.Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.
The second type: distributed direct-acting solenoid valve
It adopts the principle: it is a combination of direct-acting and pilot-operated principle. When there is no pressure difference between the inlet and outlet, after the power is turned on, the electromagnetic force directly lifts the pilot small valve and the main valve closing part up, 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: small size, exquisite appearance, autocratic coil, not easy to burn, can operate under zero pressure difference or vacuum, high pressure, but the power is large, requiring horizontal installation.
Third type: pilot operated solenoid valve
The principle it uses: when the power is turned on, 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 pilot hole is closed by force, 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 close 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.