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Solenoid valve core material selection of common sense

applicability
The fluid in the helium line must match the medium specified in the selected solenoid valve core material model.
The fluid temperature must be less than the calibrated temperature of the solenoid valve core material.
◇ Solenoid valve core material allows liquid viscosity is generally below 20CST, greater than 20CST should be specified.
◇ Working pressure difference, when the maximum pressure difference in the pipeline is less than 0.04MPa, direct acting and distributed direct acting type such as ZS, 2W, ZQDF, ZCM series shall be used; when the lowest differential pressure is greater than 0.04MPa, pilot type (differential type) can be used ) Solenoid valve core material; the maximum working pressure differential should be less than the maximum calibration pressure of the solenoid valve core material; general electromagnetic valve core material is one-way work, so pay attention to whether there is back pressure difference, if installed check valve .
If the fluid cleanliness is not high, install a filter in front of the solenoid valve core material. Generally, the electromagnetic valve core material requires high cleanliness of the medium.
◇ Pay attention to the flow aperture and the nozzle diameter; solenoid valve core material is generally only two-way control switch; conditions allow to install the bypass pipe, easy maintenance; water hammer to customize the electromagnetic valve core material opening and closing time adjustment.
◇ Pay attention to the influence of the ambient temperature on the solenoid valve core material.
◇ Supply current and power consumption should be selected according to the output capacity. The supply voltage is generally allowed to be ±10%. It must be noted that the VA value is higher when the AC starts.

reliability
◇ Solenoid valve iron core material is divided into normally closed and normally open two kinds; normally selected normally closed type, open power, power off; but in the open time is very long, the closing time is very short to use normally open type.
◇ life test, the factory is generally a type test project, to be exact, there is no professional standard for solenoid valve core materials in China, so use electromagnetic valve core material manufacturers should be cautious.
◇ The action time is very short. When the frequency is high, the direct action type is generally selected and the large caliber is used for the fast series.

safety
◇ General solenoid valve core material is not waterproof, please use waterproof type when the conditions are not allowed, manufacturers can customize.
最高 The highest nominal pressure of the core material 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.
For all corrosive liquids, all-stainless steel type should be used. For strong corrosive fluids, plastic king (SLF) solenoid valve iron core materials should be used.
◇ Explosion-proof products must be selected for explosive atmospheres.

Economical
There are many solenoid valve core materials that can be used universally, but the most economical products should be selected based on the above three points.
Structural principle of solenoid valve core material
Direct-acting solenoid valve core materials are normally closed and normally open. Normally closed type when the power is off, when the coil is energized, electromagnetic force is generated, so that the moving core overcomes the spring force and the static iron core directly opens the valve, the medium is the passage; when the coil is powered off, the electromagnetic force disappears, the moving iron The core is reset under the action of the spring force, and the valve is closed directly and the medium is blocked. Simple structure, reliable operation, normal work under zero differential pressure and micro vacuum. Normally open type is just the opposite. If less than DN6 flow path solenoid valve core material.
Step-by-step direct-acting solenoid valve core material
The valve adopts one-time valve opening and secondary valve opening 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, electromagnetic force is generated so that the pressure of the moving iron core and the upper cavity of the main valve is unloaded through the pilot valve port, and the main valve core is moved upwards under the action of the pressure difference and the electromagnetic force to open the main valve medium. 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. Such as: ZQDF, ZS, 2W and so on.
Indirect pilot solenoid valve core material
The electromagnetic series is formed by combining the pilot valve and the main valve core to form a channel; the normally closed type is closed when it is not energized. When the coil is energized, a magnetic force is generated so that the moving iron core and the static iron core are attracted, the pilot valve port is opened, and the medium flows toward the outlet. At this time, the pressure of the upper valve of the main valve core decreases and is lower than the pressure of the inlet side, forming a pressure difference against the spring. The resistance moves upwards and reaches the purpose of opening the main valve port, and the medium circulates. When the coil is de-energized, the magnetic force disappears and the moving iron core moves downwards under the action of the spring force, closing the main valve port. The normally open principle is just the opposite. Such as ZCZ and so on.

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