458-2950 is suitable for loader proportional solenoid valve engineering machinery accessories

The working principle and troubleshooting of excavator solenoid valve are introduced
The solenoid valve uses an electromagnet to push the valve core to control the direction of compressed air, thereby controlling the direction of the pneumatic actuator switch.
The electromagnet used to operate the solenoid valve is divided into AC and DC:
1. The voltage of AC electromagnet is generally 220 volts. It is characterized by large starting power, short reversing time and low price. However, when the valve core is stuck or the suction is not enough and the iron core is not sucked on, the electromagnet is easy to burn out due to excessive current, so the working reliability is poor, the impact of action, and the life is low.
2, DC electromagnet voltage is generally 24 volts. Its advantages are reliable work, not because the spore is stuck and burned out, long life, small size, but the starting power is smaller than the AC electromagnet, and in the absence of DC power supply, the need for rectification equipment. In order to improve the working reliability and life of the electromagnetic reversing valve, in recent years, wet electromagnet is increasingly widely used at home and abroad, this electromagnet and the slide valve push rod do not need to be sealed, eliminating the friction at the O-shaped sealing ring, its electromagnetic coil outside directly sealed with engineering plastic, not another metal shell, which ensures insulation, but also conducive to heat dissipation, so reliable work, Low impact, long life.
So far, the solenoid valve at home and abroad is divided into three categories in principle (namely: direct acting type, step child pilot type), and from the difference in valve disc structure and material and principle difference is divided into six sub-categories (direct acting diaphragm structure, step double plate structure, pilot film structure, direct acting piston structure, step direct acting piston structure, pilot piston structure).
Direct acting solenoid valve:
Principle: When energized, the electromagnetic force generated by the electromagnetic coil lifts the closing part from the seat, and the valve opens; When the power is off, the electromagnetic force disappears, the spring presses the closing part on the seat, and the valve is closed.
Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm.