One: applicability
The fluid in the line must be the same as the medium calibrated solenoid valve in the selected solenoid valve series.
The temperature of the fluid must be less than the calibration temperature of the solenoid valve selected.
Solenoid valves allow liquid viscosity to be generally below 20 CST, and greater than 20 CST should be noted.
Working pressure difference, the maximum pressure difference of the pipeline should be less than 0.04MPa, such as ZS, 2W, ZQDF, ZCM series and other direct-acting and step-by-step direct-acting type; when the minimum working pressure difference is greater than 0.04MPa, the pilot type can be used. Differential) Solenoid valve; the maximum working pressure difference should be less than the maximum calibration pressure of the solenoid valve; the general solenoid valve is one-way work, 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 of 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 tube 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.
Second, reliability
Solenoid valve solenoid valve is divided into two types: normally closed and normally open; generally used normally closed type, power on, power off; but when the opening time is very long, the short open type should be used.
Life test, the factory is generally a type test project. To be exact, there is no professional standard for solenoid valves in China. Therefore, it is prudent to use solenoid valve manufacturers.
When the action time is short and the frequency is high, the direct motion type is generally selected, and the large diameter is selected as the fast series.
Third, security
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 accidents will occur.
For corrosive liquids, all stainless steel type should be used, and strong corrosive fluid should be plastic king.
Solenoid valve SLF) Solenoid valve.
Explosive environments must use the corresponding explosion-proof products.
Fourth, economic
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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