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Working principle of solenoid valve

1. External leakage is blocked, internal leakage is easy to control and safe to use. Internal and external leakage is an element endangering safety. Other automatic control valves usually extend the valve stem, and the rotation or movement of the valve core is controlled by electric, pneumatic and hydraulic actuators. This must solve the problem of long-term action of the external leakage of the valve stem dynamic seal; only the solenoid valve is completed with an electromagnetic force acting on the iron core sealed in the magnetic isolation sleeve of the electric control valve. There is no dynamic seal, so the external leakage is easy to block . The torque control of the electric valve is not easy, it is easy to produce internal leakage, or even pull off the stem head; the structure of the solenoid valve is easy to control the internal leakage until it drops to zero. Therefore, the use of solenoid valves is particularly safe, especially suitable for corrosive, toxic or high and low temperature media.

2. The system is simple, and then connected to the computer. The solenoid valve itself is simple in structure and low in price. It is easier to install and maintain than other types of actuators such as regulating valves. What is more remarkable is that the automatic control system is much simpler and the price is much lower. Because the solenoid valve is controlled by the switch signal, it is very convenient to connect with the industrial computer. In today's era where computers are popular and prices have fallen sharply, the advantages of solenoid valves are even more obvious.

3. Action express, tiny power and light appearance. The response time of the solenoid valve can be as short as a few milliseconds, even the pilot solenoid valve can be controlled within tens of milliseconds. Due to the self-forming circuit, the reaction is more sensitive than other automatic control valves. The well-designed solenoid valve coil has low power consumption and is an energy-saving product; it can also just trigger the action and automatically maintain the valve position, which usually does not consume electricity at all. The small size of the solenoid valve saves space and is light and beautiful.

4. The adjustment accuracy is limited, and the applicable medium is limited. Solenoid valves usually only have two states of switching, and the spool can only be in two extreme positions, which cannot be continuously adjusted, so the accuracy of adjustment is also limited.

The solenoid valve has high requirements on the cleanliness of the medium, and the granular medium cannot be applied. If it is an impurity, it must be filtered out first. In addition, the viscous medium cannot be applied, and the viscosity range of the medium for a specific product is relatively narrow.

5. Various models and wide applications. Although the solenoid valve has inherent shortcomings, its advantages are still very outstanding, so it is designed into a variety of products to meet various needs and has a wide range of uses. The advancement of solenoid valve technology also revolves around how to overcome congenital deficiencies and how to better play the inherent advantages.

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