Distinguishing the Quality of Electromagnetic Reversing Valve in Hydraulic System

As one of the commonly used and standardized hydraulic components in the hydraulic system, the electromagnetic reversing valve is relatively common. But if you want to know clearly the quality of the electromagnetic reversing valve, how should you distinguish it?

1. The process of electromagnetic reversing valve

① Mainly manifested in processing technology and precision.

② The fit gap between the valve core and the valve body, since the valve core needs to move smoothly in the valve body, a certain gap must be ensured between the two.

③ If the gap is too large, the sealing between the oil ports cannot be realized, and the internal leakage is too large.

④ Under the premise of smooth movement of the spool, the smaller the fit clearance, the better the electromagnetic reversing valve can withstand high pressure and maintain a good seal.

⑤ The coaxiality of the spool also has extremely high requirements. The coaxiality of the valve core is poor, and the force on each point of the valve core is not equal under the pressure environment. The pressure difference causes the valve core to be pushed to one side and close to the inner wall of the valve, causing the valve to be stuck.

⑥ Some inferior electromagnetic reversing valves are prone to sticking after running for a certain period of time. Sometimes, the hardness of the valve core is low and the coaxiality decreases after wear and tear.

2. Material

① The electromagnetic reversing valve adopts a slide valve structure. When the electromagnet is energized, the cylindrical valve core moves back and forth inside the valve body, which will inevitably cause friction with the valve body.

② The electromagnetic reversing valve is subjected to high pressure inside during operation, which aggravates the wear phenomenon. Therefore, the environment with high pressure and high frequency has higher requirements on the durability of the electromagnetic reversing valve.

③ For ordinary electromagnetic reversing valves with low hardness of the valve core and valve body, in this high-pressure and high-frequency work, the wear is fast, which increases the fit gap between the valve body and the valve core, and when it reaches a certain limit, it will Cause the internal leakage of the electromagnetic reversing valve to increase.

④ The valve body is cast with ductile iron, and the hardness of the valve body can be increased through the proportioning process of raw materials.

⑤ Good electromagnets, copper wires, silicon steel sheets, and white iron pipes have high material specifications. In addition to ensuring long-term pressure resistance and smooth operation in high-voltage environments, they can also ensure low temperature rise during high-voltage and high-frequency work, and extend the electromagnet itself. Iron service life.

⑥ It can help control the temperature rise of hydraulic oil. If the hydraulic oil temperature is too high, the oil quality will change, which will easily cause the hydraulic system to malfunction or even component failure.

⑦ Other detailed materials, such as the hardness of the sealing O-ring, the material of the return spring, etc., will also affect the working performance of the electromagnetic reversing valve.