solenoid valve Main Category:
1, solenoid valve is divided into three categories in principle:
1) Direct Direct Direct Direction Vallery Valley:
Principles: Electromagnetic coils are generated by electricity. Magnetic put off from valve The seat is lifted and the valve is opened; when the power is turned off, the electromagnetic force disappears, the spring is pressed on the valve seat, and the valve is closed.
Features: It can work normally during vacuum, negative pressure, and zero pressure, but the diameter generally does not exceed 25mm.
2) Step -step direct -motion -of -motion solenoid valve:
Principle: It is a principle of combining direct movement and pilot type. When there is no pressure difference between the entrance and the exit The pieces are lifted up in turn, and the valve is opened. When the entrance and the exit reaches the starting voltage difference, after the power is powered, the electromagnetic pioneer is the small valve. Power or medium pressure push the closure part and move down to make the valve close.
Features: It can also be moved during zero -voltage difference or vacuum and high voltage, but the power is large, and it must be installed horizontally.
3) Pioneer solenoid valve:
Principle: When power is powered, the electromagnetic force opens up the pilot hole, and the pressure of the upper cavity chamber drops rapidly. Open; during power off, the spring force is turned off, and the entrance pressure quickly forms a lower high pressure difference between the valve parts through the barrier. The fluid pressure is pushed to move downward and the valve is closed.
Features: The upper limit of the fluid pressure range is high, and it can be installed at arbitrarily (required) but must meet the fluid pressure difference conditions.
2, the solenoid valve in the frequency conversion water supply from the difference between the valve structure and the material, the principle differences, are divided into six branches: direct film structure, step -by -step direct film structure, pilot film structure, direct movement, direct movement, direct movement, direct movement Pistons structure, step -by -step piston structure, pilot piston structure.
3、电磁阀按照功能分类：水用电磁阀、蒸汽电磁阀、制冷电磁阀、低温电磁阀、燃气电磁阀、消防电磁阀、氨用电磁阀、气体电磁阀、液体电磁阀、微型电磁阀、 pulse solenoid valve , hydraulic solenoid valve often open solenoid valve, oil solenoid valve, DC solenoid valve, high voltage solenoid valve, explosion -proof solenoid valve, etc.
Bohai Variable Poor Water Supply Equipment
The Selection Principles of the solenoid valve in the water supply equipment in the water supply equipment:
Safety:
1, corrosive medium: should be selected from plastic king solenoid valve and all. Rust steel; for a strong corrosive medium, you must use an isolated film Piece. Neutral media should also use the solenoid valve with copper alloy as the valve shell material. Otherwise, rust chips are often falling off in the valve shell, especially if the movement is not frequent. The ammonia valve cannot be made of copper.
2, explosive environment: The corresponding explosion -proof level products must be selected, and waterproof and dustproof varieties should be used for multi -occasion or dust.
3, the nominal pressure of the solenoid valve should exceed the highest work pressure in the tube.
Constitution Water Supply System The application of solenoid valves:
1, media characteristics
1) Quality, liquid or hybrid electromotor valves;
2) Different specifications of media temperature, otherwise the coil will be Burning, sealing Aging, seriously affects life life;
3) The regulation of the medium is usually below 50cst. If this value exceeds this value, when the diameter is greater than 15mm, use a multi -functional solenoid valve; when the diameter is less than 15mm, use a high viscosity solenoid valve.
4) When the medium cleaning degree is not high, the filter valve should be installed in front of the solenoid valve. When the pressure is low, the direct -mounted film type electromagnetic valve can be selected. Use two -way circulation;
6) The medium temperature should be selected within the allowable range of the solenoid valve.
2, secondary water supply equipment pipeline parameter
1) Select valve passage and models according to the medium flow requirements and pipeline connection methods;
2) Select the nominal diameter according to the flow and valve KV value, and the inner diameter of the pipeline can also be selected;
3) can be selected; Work pressure difference: The minimum working voltage difference is above 0.04MPa is an indirect pilot type; the minimum working voltage difference is close or less than zero.
3, Environmental conditions
1) The highest and minimum temperature of the environment should be selected within the allowable range;
2) The relative humidity in the environment and water droplets should be selected;
3 should often be vibrated, bumps, bumps, bumps. Special varieties should be selected with impacts, such as ship solenoid valves;
4) The use of the use of corrosive or explosive environments should be preferred according to safety requirements. The solenoid valve, because it saves the bypass and three manual valve and is convenient for online maintenance.
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