First, the selection of solenoid valve common sense
Applicability ● The fluid in the pipeline must be the same as the medium calibrated in the selected solenoid valve series.
● The temperature of the fluid must be less than the calibration temperature of the solenoid valve selected.
● Solenoid valve allows liquid viscosity to be generally below 20 CST, greater than 20 CST should be noted.
● Working pressure difference, when the maximum pressure difference of the pipeline is less than 0.04MPa, the direct-acting type such as 2W, ZQDF, series, etc. should be selected; when the minimum working pressure difference is greater than 0.04MPa, the pilot-operated (pressure differential) solenoid valve can be selected; The working pressure difference should be less than the maximum calibration pressure of the solenoid valve; generally the solenoid valve is working in one direction, so pay attention to whether there is a back pressure difference, if there is a check valve installed.
● When the fluid cleanliness is not high, the filter should be installed in front of the solenoid valve. Generally, the solenoid valve requires good cleanliness for the medium.
● Pay attention to the flow aperture and the diameter of the nozzle; the solenoid valve is generally only controlled by the two-position switch; if necessary, please install the bypass pipe for easy maintenance; when there is water hammer, customize the opening and closing time of the solenoid valve.
● Pay attention to the influence of ambient temperature on the solenoid valve.
● The power supply current and power consumption should be selected according to the output capacity. The power supply voltage is generally allowed to be ±10%. It must be noted that the VA value is higher when the AC starts.
Reliability ● Solenoid VALVES are divided into two types: normally closed and normally open. Generally, the normally closed type is used. The power is turned on and the power is turned off. However, when the opening time is long, the normally open type is selected.
● Life test, the factory is generally a type test project. It is said that there is no professional standard for solenoid valves in the country, so it is prudent to use solenoid valve manufacturers.
● When the action time is short, the frequency is generally high, and the direct motion type is generally selected. The large diameter is selected as the fast series.
Safety ● Generally, the solenoid valve is not waterproof. When the conditions are not allowed, please choose waterproof type. The factory can be customized.
● The highest nominal pressure of the solenoid valve must exceed the maximum pressure in the pipeline, otherwise the service life will be shortened or other unexpected conditions will occur.
● All stainless steel type should be used for corrosive liquid, and plastic king (SLF) solenoid valve should be used for strong corrosive fluid.
● Explosive environments must use the corresponding explosion-proof products.
Economical ● There are many solenoid valves that can be used universally, but the most economical products should be selected on the basis of meeting the above three points.
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