Pneumatic solenoid valve selection points

Pneumatic solenoid valve selection points

In the process of using the pneumatic solenoid valve, if it is improperly operated and used, the failure rate of the pneumatic solenoid valve will be large. Generally, the cause of malfunction of the solenoid valve type is incorrect installation, incorrect selection, actual operation and improper use. The general failure is manifested by damage to the components of the solenoid valve. Pneumatic solenoid valve selection points and working conditions are as follows:

First, the medium characteristics 1, the quality of gas, liquid or mixed state respectively choose different types of solenoid valves; 2, the medium temperature is different specifications, otherwise the coil will burn off, the seal is aging, seriously affecting life expectancy; 3, medium viscosity, usually in Below 50cSt. If this value is exceeded, the multi-function solenoid valve is used when the diameter is greater than 15 m, and the high-viscosity solenoid valve is used when the diameter is less than 15 m. 4. When the cleanliness of the medium is not high, the recoil filter valve should be installed in front of the solenoid valve. When the pressure is low, the direct-acting diaphragm type solenoid valve can be used. 5. If the medium is directional, and no backflow is allowed, two-way is required. Circulation; 6, the medium temperature should be selected within the allowable range of the solenoid valve.

Second, the pipeline parameters 1, according to the medium flow requirements and pipe connection method to select the valve port and model; 2, according to the flow and valve kw value selected nominal diameter, also can choose the same pipe diameter; 3, working pressure difference: minimum work The differential pressure of 0.04MP or more is optional indirect pilot type; the minimum working pressure difference is close to or less than zero, and direct or step direct type must be used.

Third, the environmental conditions 1, the highest and lowest temperature of the environment should be selected within the allowable range; 2, the environment is relatively high humidity and there are water droplets and rain, etc., should choose waterproof solenoid valve; 3, the environment often has vibration, bumps Special occasions should be selected for occasions such as impact, such as marine solenoid valves. 4. In corrosive or explosive environments, the corrosion-resistant type should be selected according to safety requirements. 5. If the environmental space is restricted, multi-function should be selected. Solenoid valve, because it eliminates the bypass and three manual valves and facilitates online maintenance.

Fourth, the power supply conditions 1, according to the type of power supply, respectively, select AC and DC solenoid valves. Generally speaking, the AC power supply is convenient to use; 2. The voltage specification should be 8C2207.DC247 as much as possible. 3. The power supply voltage fluctuation is usually +%10%.-15% for AC, and 10% for DC. If it is too bad, it must be taken. Voltage regulation measures; 4) The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the YA value is higher when the AC starts, and the indirect-lead solenoid valve should be preferred when the capacity is insufficient.

Fifth，Control Accuracy 1. The ordinary solenoid valve can only open and close two positions. When the control precision is high and the parameter requirements are stable, multiple solenoid valves should be selected. 2. Operation time: The electric signal is turned on or off to the main valve. Completion time; 3. Leakage: The amount of leakage given on the sample is the common economic rating.