Solenoid valves are electromagnetically controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. There are many kinds of solenoid valves. Different solenoid valves play different roles in the control system. The most common ones are check valves, safety valves, directional control valves, speed control valves, etc.
The role of the solenoid valve
Solenoid valves are electromagnetically controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. There are many kinds of solenoid valves. Different solenoid valves play different roles in the control system. The most common ones are check valves, safety valves, directional control valves, speed control valves, etc. The solenoid valve is controlled by the electromagnetic effect, and the main control mode is controlled by the relay. In this way, the solenoid valve can be combined with different circuits to achieve the desired control, and the precision and flexibility of the control can be guaranteed.
The pneumatic system is taken as an example to illustrate the application of the solenoid valve in industrial control. The so-called pneumatic system is a gas-based control system. In pneumatic systems, the medium of this energy is usually air. In actual use, the volume of air in the atmosphere is usually compressed to increase its pressure. Compressed air works primarily by acting on pistons or blades.
In pneumatic systems, the role of the solenoid valve is to adjust the various states of the compressed air in the control system according to the requirements of the control. The pneumatic system also needs the cooperation of other components, including the power components, actuators, switches, display devices and other auxiliary devices. equipment. The power components include various compressors, and the actuators include various cylinders. These are all indispensable parts of a pneumatic system. The valve body is an important device for the control algorithm to be realized.
For example, the check valve allows compressed air to enter the gas tank from the compressor. When the compressor is closed, the compressed air is prevented from flowing in the opposite direction. When the pressure in the gas storage tank exceeds the allowable limit, the compressed air can be discharged; the directional control valve passes. The two ports of the cylinder are alternately pressurized and exhausted to control the direction of motion; the speed regulating valve can easily realize the stepless speed regulation of the actuator.
First, the solenoid valve does not work after being energized
Check if the power wiring is defective → rewire and connector connection
Check if the power supply voltage is within the ± working range - → adjust the normal position range
Whether the coil is desoldered → re-welded
Short circuit of coil → change coil
Is the working pressure difference inappropriate → adjust the differential pressure → or replace the proportional solenoid valve
Fluid temperature is too high → replace the proportional solenoid valve
There are impurities that cause the main valve core and moving iron core of the solenoid valve to be stuck → for cleaning. If there is seal damage, replace the seal and install the filter.
The viscosity of the liquid is too high, the frequency is too high and the life is up to → replace the product
Second, the solenoid valve can not be closed
The seal of the main spool or the iron core has been damaged → replace the seal
Whether the fluid temperature and viscosity are too high → replace the solenoid valve of the opposite port
There are impurities entering the solenoid valve to produce the valve core or moving iron core → cleaning
Spring life has reached or deformed → replaced
The orifice balance hole is blocked → timely cleaning
The operating frequency is too high or the life is up to → re-elect or update the product
Third, other circumstances
Internal leak → check if the seal is damaged and the spring is not properly assembled
External leakage → loose connection or seal is broken → tighten the screw or replace the seal
There is noise when energized → the solid parts on the head are loose and tightened. The voltage fluctuation is not within the allowable range and the voltage is adjusted. The iron core suction surface is dirty or uneven, and it is cleaned or replaced in time.
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