Four essential properties of solenoid valve selection

BURKERT solenoid valve uses a once-open valve and secondary valve to connect in one body. The main valve and the pilot valve step by step make the electromagnetic force and pressure difference directly open the main valve port. When the coil is energized, an electromagnetic force is generated to cause the moving iron core and the static iron core to pull in. The pilot valve port is opened and the pilot valve port is disposed on the main valve port, and the moving iron core is connected with the main valve core. At this time, the main valve is The pressure of the chamber is unloaded through the pilot valve port. Under the action of pressure difference and electromagnetic force, the main valve core moves up and the main valve medium is opened to circulate. When the coil is de-energized, the electromagnetic force disappears. At this moment, the moving iron core closes the pilot valve hole under the action of its own weight and spring force. At this moment, the medium enters the upper cavity of the main valve core in the balance hole, so that the pressure of the upper cavity rises. The main valve is closed under the action of the spring return and pressure, and the medium is shut off. Reasonable structure, reliable operation, and reliable operation at zero differential pressure.
Choose the right solenoid valve, you need to pay attention to the following four major properties:
1. Applicability
The fluid in the tubing must match that of the media in the selected solenoid valve model. The temperature of the fluid must be less than the calibrated temperature of the selected solenoid valve. Solenoid valves allow the viscosity of liquids to be generally below 20CST, and should be indicated when more than 20CST. Working pressure difference, when the maximum pressure difference in the pipeline is less than 0.04MPa, such as 0330, 5282 series, such as direct-acting and step-by-step direct-acting; use the pilot type (differential pressure) electromagnetic when the minimum working pressure is greater than 0.04MPa. Valve; The maximum operating pressure differential should be less than the maximum calibration pressure of the solenoid valve; general solenoid valve is one-way operation, so pay attention to whether there is back pressure difference, if installed check valve. When the fluid cleanliness is not high, the filter should be installed in front of the solenoid valve. Generally, the electromagnetic valve requires better cleanliness of the medium. Pay attention to the flow aperture and the nozzle diameter; solenoid valve is generally only two-way control switch; conditions allow to install the bypass pipe, easy to repair; have water hammer phenomenon to customize the solenoid valve opening and closing time adjustment. Pay attention to the influence of the 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 at the time of AC start is high.
2. Reliability
Solenoid valves are classified into two types: normally closed and normally open; Normally selected are normally closed, energized open, and power off; however, normally open type is used when the open time is very long and closed. Life test, the factory is generally a type test project, to be exact, there is no professional standard for solenoid valves in China, so choose a solenoid valve manufacturer with care. When the operation time is very short, the direct-acting type is generally selected and the large-caliber selection is used for the fast series.
3. Security
General solenoid valve is not waterproof, please use waterproof type when conditions do not allow, factory can be customized. The highest rated pressure of the solenoid valve must exceed the maximum pressure in the pipeline, otherwise the service life will be shortened or other unexpected situations will occur. Corrosive liquids should be made of all-stainless steel type, and strong corrosive fluids should use plastic king (SLF) solenoid valves. Explosion-proof products must be selected for explosive environments.
4. Economical
There are many solenoid valves that can be used universally, but the most economical product should be chosen based on the above three points. Solenoid valve selection solenoid valve selection should first follow safety, reliability, applicability, economical four principles, followed by six on-site operating conditions (ie pipeline parameters, fluid parameters, pressure parameters, electrical Parameters, action methods, special requirements to choose).

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