FESTO solenoid valves are industrial devices that use electromagnetic effects for control purposes. They are used to adjust the direction, flow rate, speed, and other parameters of media in industrial control systems. Solenoid valves are mainly controlled by relays. Therefore, the solenoid valve can be used with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed.
There are many types of solenoid valves. The most common ones are check valves, safety valves, directional control valves, and speed control valves. Solenoid valve in accordance with the driving force and pneumatic solenoid valve, electro-magnetic valve and hydraulic solenoid valve. Solenoid valve selection should first follow the four principles of safety, reliability, applicability, and economy, followed by six on-site conditions that are pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, special The requirement to select FESTO solenoid valves is divided into three main categories:
1. Direct-acting solenoid valve: Principle: When the power is turned on, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat and the valve opens; when the power is turned off, the electromagnetic force disappears, the spring presses the closing part 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. Step-by-step direct acting solenoid valve: Principle: It is a combination of direct acting 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 connects the small pilot valve and the main valve closing part. Lift up 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 upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it down to close the valve. Features: In the zero pressure difference or vacuum, high pressure can also be * action, but the power is relatively large, requires a horizontal installation.
3. 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 low differential pressure is formed around the closing member. The fluid pressure pushes the closing member to move upwards and the valve opens; When electricity is applied, the spring force closes the pilot hole, and the inlet pressure rapidly bypasses the bypass hole to form a lower, upper, higher pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve. Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customization is required) but the fluid pressure difference must be met. Solenoid valve is divided into six sub-categories from the difference in principle and valve structure and material: straight-acting diaphragm structure, step-by-step diaphragm structure, pilot diaphragm structure, direct-acting piston structure, step-by-step Direct-acting piston structure and pilot piston structure.
There are many types of solenoid valves. The most common ones are check valves, safety valves, directional control valves, and speed control valves. Solenoid valve in accordance with the driving force and pneumatic solenoid valve, electro-magnetic valve and hydraulic solenoid valve. Solenoid valve selection should first follow the four principles of safety, reliability, applicability, and economy, followed by six on-site conditions that are pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, special The requirement to select FESTO solenoid valves is divided into three main categories:
1. Direct-acting solenoid valve: Principle: When the power is turned on, the electromagnetic coil generates electromagnetic force to lift the closing part from the valve seat and the valve opens; when the power is turned off, the electromagnetic force disappears, the spring presses the closing part 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. Step-by-step direct acting solenoid valve: Principle: It is a combination of direct acting 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 connects the small pilot valve and the main valve closing part. Lift up 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 upwards by utilizing the pressure difference; when the power is off, the pilot valve utilizes the spring. Force or medium pressure pushes the closure and moves it down to close the valve. Features: In the zero pressure difference or vacuum, high pressure can also be * action, but the power is relatively large, requires a horizontal installation.
3. 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 low differential pressure is formed around the closing member. The fluid pressure pushes the closing member to move upwards and the valve opens; When electricity is applied, the spring force closes the pilot hole, and the inlet pressure rapidly bypasses the bypass hole to form a lower, upper, higher pressure differential around the valve closing member. The fluid pressure pushes the closing member downward and closes the valve. Features: The upper limit of the fluid pressure range is high and can be installed arbitrarily (customization is required) but the fluid pressure difference must be met. Solenoid valve is divided into six sub-categories from the difference in principle and valve structure and material: straight-acting diaphragm structure, step-by-step diaphragm structure, pilot diaphragm structure, direct-acting piston structure, step-by-step Direct-acting piston structure and pilot piston structure.
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