One, the principle of work
Solenoid valve has a closed cavity, open holes in different locations, each hole is connected to a different oil pipe, the cavity in the middle of the piston, on both sides of the two solenoids, which side of the magnet coil is energized the valve body will be attracted to which side, through the control of the valve body to open or close the different drain holes, and the inlet holes are always open, the hydraulic oil into the different drain pipes, and then through the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure, the oil pressure and the oil pressure. The hydraulic oil will enter into different oil pipes, and then through the oil pressure to push the piston of the cylinder, the piston drives the piston rod, and the piston rod drives the mechanical device. In this way, by controlling the electromagnet current breakage control of mechanical movement. From the principle is divided into three categories: direct-acting solenoid valve, step-by-step direct-acting solenoid valve, pilot-operated solenoid valve.
Second, the installation of attention
1, the installation should pay attention to the valve body arrow should be consistent with the medium flow direction. Can not be installed in a direct drip or splash of water. Solenoid valve should be installed vertically upwards;
2, the solenoid valve should ensure that the power supply voltage for the rated voltage of 15% -10% fluctuations within the normal operation;
3, solenoid valve installation, there shall be no reverse pressure difference in the pipeline. And need to be energized several times to make the right temperature before officially put into use;
4, solenoid valve should be thoroughly cleaned before installation of the pipeline. Passed into the medium should be free of impurities. Valve before the installation of filters;
5, when the solenoid valve failure or cleaning, in order to ensure that the system continues to operate, should be installed bypass device.
Three, the failure of the solenoid valve will directly affect the switching valve and regulating valve action, common faults are solenoid valve does not operate, should be investigated from the following aspects:
1, the solenoid valve wiring loose or wire off, the solenoid valve shall not be electric, you can tighten the wire.
2, solenoid valve coil burned, can remove the solenoid valve wiring, measured with a multimeter, if the open circuit, the solenoid valve coil burned. Reasons have coil moisture, caused by bad insulation and magnetic leakage, resulting in excessive current in the coil and burned, so to prevent rain into 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, the suction force is not enough can also make the coil burned. Emergency treatment, the coil on the manual button from the normal operation of the "0" position to "1" position, so that the valve open.
3, the solenoid valve stuck: solenoid valve slide valve sleeve and spool with a small gap, generally single-piece assembly, when there are mechanical impurities into or too little lubricant, it is easy to get stuck. Treatment method can be used from the head of the steel wire poked into a small hole, so that it pops back. The fundamental solution is to dismantle the solenoid valve, remove the spool and spool sleeve cleaning, so that the spool in the valve sleeve action is flexible. When disassembled, attention should be paid to the assembly order of components and external wiring position, in order to reassemble and wiring correctly, but also to check whether the oil mist spray hole is blocked, whether the lubricant is enough.
4, air leakage: air leakage will cause insufficient air pressure, making it difficult to open and close the mandatory valve, the reason is that the sealing gasket is damaged or wear and tear of the slide valve and caused by a few cavities to run out of air. In dealing with the switching system solenoid valve failure, should choose the appropriate time, such as the solenoid valve is in the loss of power to deal with, if in a switching gap processing is not complete, can be suspended from the switching system, from the processing.