Selection principle of solenoid valve: applicability

- Mar 16, 2020-

1.Media characteristics

1) Different types of solenoid valves are used in the gas, liquid or mixed state;

2) Products with different media temperatures, otherwise the coils will burn out and the seals will age, which will seriously affect the service life;

3) Medium viscosity, usually below 50 cSt. If it exceeds this value, a multi-function solenoid valve is used when the diameter is greater than 15mm; a high-viscosity solenoid valve is used when the diameter is less than 15mm.

4) When the medium cleanliness is not high, a recoil filter valve should be equipped in front of the solenoid valve. When the pressure is low, a direct-acting diaphragm solenoid valve can be selected;

5) If the medium is directional and does not allow reverse flow, two-way circulation is required;

6) The medium temperature should be selected within the allowable range of the solenoid valve.

2.Pipe parameters

1) Select the valve port and model according to the requirements of the medium flow direction and the pipeline connection method;

2) The nominal diameter is selected according to the flow rate and the Kv value of the valve.

3) Working pressure difference: The minimum working pressure difference above 0.04Mpa is optional with the indirect pilot type; the minimum working pressure difference close to or less than zero must be selected directly or stepwise direct.

3. Environmental conditions

1) The maximum and minimum temperature of the environment should be selected within the allowable range;

2) When the environment has high relative humidity and there are drops of water and rain, etc., a waterproof solenoid valve should be selected;

3) Special varieties such as marine solenoid valves should be selected in the environment where there are often vibrations, bumps and shocks;

4) For use in corrosive or explosive environments, the corrosion-resistant type should be selected according to safety requirements;

5) If the environmental space is limited, a multi-function solenoid valve is required because it eliminates the bypass and three manual valves and facilitates online maintenance.

4.Power conditions

1) AC and DC solenoid valves are selected according to the type of power supply. Generally speaking, AC power is easy to access;

2) AC220V.DC24V is preferred as the voltage specification;

3) Power supply voltage fluctuations usually choose +% 10% .- 15% for AC, DC allowance is about ±% 10, if it is out of tolerance, voltage stabilization measures must be taken;

4) The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the VA value is higher at the time of AC starting, and the indirect pilot solenoid valve should be preferentially selected when the capacity is insufficient.

5.Control accuracy

1) Ordinary solenoid valve has only two positions, on and off. Multi-position solenoid valve should be selected when high control precision is required and parameters are required to be stable.

2) Action time: refers to the time from when the electrical signal is turned on or off to the completion of the main valve action;

3) Leakage: The leakage value given on the sample is a common economic grade.