Important parameters of solenoid valve selection

As an important component of industrial automation control, the selection of solenoid valve plays an important role in automation control, so it is very important to choose a product that is suitable for the working conditions and the price is also suitable. Then, what parameters should be paid attention to when selecting a product

1. Medium pressure: medium pressure is one of the most important parameters of solenoid valve. Generally, the pressure of solenoid valve can be divided into three ranges:

(1) Low pressure (zero pressure difference): this condition refers to the condition that the medium pressure is very low and there is almost no pressure (generally lower than 0.1MPa). According to this pressure, we need to choose direct acting solenoid valve (zero pressure difference solenoid valve). For low pressure, if we choose pilot solenoid valve, the solenoid valve will not open

(2) Medium pressure (pressure difference is more than 0.1MPa): in this case, the pressure range of medium is generally from 0.1MPa to 1.6Mpa. In this case, the pilot solenoid valve can be selected to adapt to the working conditions and extend the service life of the solenoid valve

(3) High pressure: in this case, the actual working pressure of the medium is very high (the company's high-pressure solenoid valve has been used under the pressure of 300mpa), so the high-pressure solenoid valve should be selected

2. Caliber size and connection mode: the solenoid valve with proper pipeline flow shall be selected according to the actual situation of the pipeline. Generally, the caliber of the solenoid valve shall be selected according to the inner diameter of the pipeline. For example, if the outer diameter of the pipeline is 32 mm and the inner diameter is 25 mm, the caliber of the solenoid valve shall be 25 mm, i.e. DN25 solenoid valve. Generally, the connection mode can be threaded (g thread, NPT thread, RC thread, etc.), Flange connection (Ministry of chemical industry standard, Ministry of mechanical industry standard), welding

3. Power supply voltage: select appropriate power supply according to actual working conditions, such as: AC220V, AC380V, DC24V, DC12V. Pay attention to control the fluctuation range of power supply itself within ± 10% so that the solenoid valve can operate stably. When selecting power supply, it is better to make sure that the power supply power reaches the rated power of solenoid valve, otherwise it may occur after power on because the power supply power is too small, The solenoid does not respond

4. Valve body material: generally, the valve body material of solenoid valve is stainless steel, polytetrafluoroethylene, brass, cast iron and aluminum alloy. However, according to the specific situation, appropriate valve body material should also be selected. Generally, brass, cast iron and other materials can be selected for non corrosive water, gas and oil. Because of relatively low cost, stainless steel 304 material can be selected for weak corrosive medium, Strong corrosive medium can choose stainless steel 316L material and polytetrafluoroethylene material

5. Applicable temperature: according to the different internal seals, the applicable temperature range of general solenoid valve is also different. General NBR seal is suitable for the medium temperature range of - 5 to + 80 degrees, fluororubber seal is suitable for the range of - 5 to + 120 degrees. Silica gel seal is suitable for the range of - 50 to + 60 degrees, polytetrafluoroethylene seal is suitable for the range of - 196 to + 250 degrees. Ultra high temperature + 600 degrees solenoid valve, Developed by our company, the inner part is sealed with packing

To sum up, these parameters are the most important parameters for selecting a solenoid valve and are indispensable. In addition to the above five aspects, we should also pay attention to whether the selected solenoid valve is a normally open solenoid valve, or a solenoid valve with manual operation, or a solenoid valve with signal feedback, etc