loader High quality Proportional solenoid valve 25/222913

     Common faults of solenoid valve 

     Air leakage will cause insufficient air pressure, which makes it difficult to open and close the forced valve, because the sealing gasket is damaged or the spool valve is worn and several cavities are trapped. When dealing with the failure of the solenoid valve of the switching system, the appropriate time should be selected to deal with the solenoid valve when it is out of power. If the processing cannot be completed within a switching gap, the switching system can be suspended and handled calmly.

The drive is different. The driving device of the proportional valve is the proportional electromagnet, and the driving device of the servo valve is the force motor or the torque motor, and the performance parameters are different. Hysteresis, middle dead zone, bandwidth, filtration accuracy and other characteristics are different, so the application occasions are different, servo valves and servo proportional valves are mainly used in closed-loop control systems, proportional valves of other structures are mainly used in open loop control systems and closed-loop speed control systems.

The input power of the general proportional valve is large, basically in the hundreds of Ma to 1 amp or more, while the input power of the ordinary valve is small, basically in the tens of MA; The control accuracy of the proportional valve is slightly lower, the hysteresis is larger than that of the servo valve, and the control accuracy of the ordinary valve is high, but the requirements for the oil are also high.

It is understood from the structure that the spool of the proportional valve is balanced by electromagnetic force and hydraulic pressure and spring force, while the ordinary valve is balanced by hydraulic pressure, so the proportional valve has no advantage in controlling large flow and high pressure. There are proportional valves Z early products are open, which should be the reason why it is called proportional valves.

In application, the ordinary valve is used more widely, not only can be used for precise position, speed and other control, but also with action, so the power steering of the car you drive is a servo system, which is difficult to achieve proportional valves.