Solenoid valve in our production is widely used, we in the maintenance of production must have met a lot of problems on the solenoid valve, also dealt with a variety of failures, we must also have accumulated a lot of solenoid valve failure Handling experience, and I deal with solenoid valve fault in maintenance relative to other instrument control fault is relatively small, and now I discuss this issue with everyone, eager to learn more from everyone experience and work together to improve. We first have a preliminary understanding of the solenoid valve, solenoid valve is composed of a solenoid coil and the core is one or more holes in the valve body. When the coil is energized or de-energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, in order to achieve the purpose of changing the fluid direction. The electromagnetic components of the solenoid valve are composed of a fixed iron core, a moving iron core and a coil. The valve body is composed of a spool valve, a sliding valve sleeve and a spring base. Solenoid coils are mounted directly on the valve body and the valve body is enclosed in a sealed tube to form a compact and compact combination. We used in the production of solenoid valves are two tee, two four, two five links. Here to talk about the meaning of the first two: for the solenoid valve is charged and out of power, the valve is controlled on and off. Our oxygen meter instrument control system, two three-way solenoid valve with the most, it can be used in production to connect or cut off the gas source, so as to switch the pneumatic control membrane head gas path. The utility model is composed of a valve body, a valve cover, an electromagnetic component, a spring and a sealing structure. The sealing block at the bottom of the moving iron core closes the air inlet of the valve body by the pressure of a spring. After electrifying, the electromagnet is sucked in and the sealing block with springs on the upper part of the moving iron core turns off the exhaust port, and the airflow enters the membrane head from the air inlet to play a controlling role. When the power is lost, the electromagnetic force disappears, the moving iron core leaves the fixed iron core under the action of spring force, moves downwards, opens the exhaust port, blocks the intake port, and the membrane head airflow is discharged through the exhaust port, and the diaphragm is restored The original location. In our oxygen plant, there are applications such as emergency shut-off of the turbo-expander inlet membrane regulating valve, etc. The four-way solenoid valve has many applications in our production and its working principle is as follows: When current flows through the coil, Generate excitation, the fixed core pull the moving core, the moving core drives the spool and compression springs, changing the spool position, thus changing the direction of the fluid. When the coil is de-energized, the spool valve is pushed forward by the spring force of the spring, and the iron core moves backwards to make the fluid flow in the original direction. In our oxygen production, the molecular sieve switching system to force the valve switch is controlled by a two-position four-way solenoid valve, the air flow were supplied to both ends of the forced valve piston. In order to control the opening and closing force valve. Solenoid valve failure will have a direct impact on the switching valve and control valve action, the common fault solenoid valve does not act, should be checked from the following aspects: (1) Solenoid valve loose or thread head off, the solenoid valve can not be tight, tight Thread fixed head. (2) Solenoid coil burned out, remove the solenoid valve wiring, with a multimeter to measure, if the open circuit, the solenoid valve coil burned out. The reason is the coil damp, resulting in poor insulation and leakage flux, causing the coil current is too large and burned, so to prevent rain into the solenoid valve. In addition, the spring is too strong, the reaction force is too large, the number of coil turns is too small, and the suction is insufficient, the coil can also be burned. In emergency, the manual button on the coil can be turned to "1" position by the "0" bit during normal operation, so that the valve is opened. (3) solenoid valve stuck. Solenoid valve sleeve and valve spool with a very small gap (less than 0.008mm), are generally a single assembly, when mechanical impurities into or too little oil, it is easy to get stuck. Approach can be used steel wire from the hole into the head, make it bounce. The fundamental solution is to remove the solenoid valve, remove the valve plug and spool sleeve, with CCI4 cleaning, making the spool movement in the valve sleeve flexibility. Disassembly should pay attention to the assembly sequence and the location of external wiring in order to reassemble and wiring properly, but also check the oil mist hole is blocked, the lubricating oil is sufficient. (4) leaks. Leakage will result in insufficient air pressure, making it difficult to open and close the forced valve due to damaged gaskets or slide valve wear caused by several cavity blow-by gas. In dealing with switching system solenoid valve failure, should choose the appropriate time, and so on when the solenoid valve is in power loss processing, if not within a switching gap processing, the switching system can be suspended, calmly deal with.
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