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Solenoid valve application in the field of air separation

A preliminary understanding of the solenoid valve, the solenoid valve consists of a magnetic coil and a magnetic core, is a valve body containing one or more holes. 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 to achieve the purpose of changing the direction of the fluid. The electromagnetic components of the electromagnetic valve are composed of fixed cores, moving iron cores, coils, etc. The valve body consists of a slide valve core, a slide valve cover, and a spring base. The solenoid coil is directly mounted on the valve body, and the valve body is enclosed in a sealed tube to form a compact, compact combination. The solenoid valves we commonly use in production are two-way three-way, two-position four-way, two-position five-way and so on. Let's talk about the meaning of the two positions here: For the solenoid valve, it is charged and de-energized. For the controlled valve, it is on and off.
Oxygen machine control system, the two-position three-way solenoid valve with the most, it can be used to switch on or off the gas source in production, thus the pneumatic control membrane head gas circuit.
It consists of valve body, valve cover, electromagnetic assembly, spring and sealing structure and other components. The sealing block at the bottom of the moving iron core closes the air inlet of the valve body by the pressure of the spring. After the power is turned on, the electromagnet pulls in, and the seal block with the spring on the upper part of the moving iron core closes the air outlet, and the air flow enters the membrane head from the air inlet to play a control role. When the power is lost, the electromagnetic force disappears, the moving iron core leaves the fixed iron core under the action of the spring force, moves downwards, opens the exhaust port, blocks the air inlet, and the film head air discharges through the exhaust port, and the diaphragm recovers. Original location. In our oxygen plant, there are applications for the emergency shut-off of the diaphragm inlet valve of the turboexpander.
Four-way solenoid valve is also used in our production, and its working principle is as follows:
When a current passes through the coil, excitation occurs, and the fixed iron core attracts and moves the iron core. The moving iron core drives the slide valve core and compresses the spring, which changes the position of the slide valve core, thereby changing the direction of the fluid. When the coil is de-energized, the slide valve core is pushed by the elastic force of the spring, and the core is moved back to move the fluid in the original direction. In our oxygen production, the switch of the forced-action valve of the molecular sieve switching system is controlled by a two-position four-way solenoid valve, and the air flow is respectively supplied to both ends of the piston of the forcing valve. In order to control the opening and closing of the forced valve. The fault of the solenoid valve will directly affect the action of the switching valve and the regulating valve. Common faults are that the solenoid valve does not move and should be investigated from the following aspects:
(1) The solenoid valve lug looses or the wire ends fall off. The solenoid valve must not be electrically charged. The lug can be tightened.
(2) Air leakage. Leakage can cause insufficient air pressure, making it difficult to open and close a forced valve due to damage to the gasket or sliding valve wear resulting in several cavities.
(3) The solenoid valve is stuck. The clearance between the sliding valve sleeve and the valve core of the solenoid valve is very small (less than 0.008mm). It is generally a one-piece assembly. When there are mechanical impurities or too little lubricant, it is easy to get stuck. The treatment method can use steel wire to invade from the head hole to make it rebound. The fundamental solution is to remove the solenoid valve, remove the valve plug and the valve plug sleeve, and clean it with CCI4 to make the valve plug flexible in the valve sleeve. When disassembling, attention should be paid to the assembly sequence of the components and the external wiring positions in order to re-assemble and connect correctly. Also check whether the oil spray hole of the oil mister is blocked and whether the lubricant is sufficient.
(4) Solenoid valve coil is burned out, the wiring of the solenoid valve can be removed, and measured with a multimeter. If the circuit is opened, the solenoid valve coil is burned out. The reason is that the coil is damp, causing poor insulation and magnetic flux leakage, causing excessive current in the coil and burning, so prevent rainwater from entering the solenoid valve. In addition, the spring is too hard, the reaction force is too large, the number of turns of the coil is too small, and the suction is insufficient to make the coil burn out. In emergency handling, the manual button on the coil can be switched from the "0" position to the "1" position during normal operation so that the valve opens.
When dealing with the malfunction of the solenoid valve of the switching system, an appropriate timing should be selected. When the solenoid valve is de-energized, it is processed. If the processing cannot be completed within a switching gap, the switching system can be suspended and handled with ease.

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