Rexroth solenoid valves are common faults

Rexroth solenoid valves are composed of solenoid coils and magnetic cores, and are valve bodies containing one or several holes. When the coil is energized or de-energized, the operation of the core will cause the fluid to pass through the valve body or be cut off to change the direction of the fluid. The solenoid parts of the solenoid valve are composed of fixed iron core, moving iron core, coil and other components; The valve body part is composed of a spool core, a spool sleeve, a spring base, etc. The solenoid coil is mounted directly on the valve body, which is enclosed in a sealed tube, forming a concise, compact combination. The solenoid valves we commonly use in production are two-position three-way, two-position four-way, two-position five-way and so on. Here is the meaning of the two: for the solenoid valve, it is charged and lost, and for the controlled valve, it is open and closed.

The failure of the solenoid valve will directly affect the action of the switching valve and the control valve, and the common faults are the inaction of the solenoid valve, which should be investigated from the following aspects:

1. Rexroth solenoid valve terminal is loose or the wire head falls off, the solenoid valve is not electrified, and the wire head can be tightened.

2. Rexroth solenoid valve coil burns out, you can remove the wiring of the solenoid valve, measure it with a multimeter, if it is open, the solenoid valve coil burns out. The reason is that the coil is damp, which causes poor insulation and magnetic leakage, resulting in excessive current in the coil and burning, so it is necessary to prevent rainwater from entering the solenoid valve. In addition, the coil can also burn out due to the fact that the spring is too hard, the reaction force is too large, the number of coil turns is too small, and the suction power is not enough. In case of emergency treatment, the manual button on the coil can be changed from the "0" position to the "1" position during normal operation, so that the valve can be opened.

3. Rexroth solenoid valve is stuck: the matching gap between the spool valve sleeve and the valve core of the solenoid valve is very small (less than 0.008mm), and it is generally a single-piece assembly, which is easy to get stuck when there are mechanical impurities brought in or too little lubricating oil. The treatment method can be to poke a steel wire through the small hole in the head to make it spring back. The fundamental solution is to remove the solenoid valve, take out the valve core and the valve core sleeve, and clean it with CCI4 to make the valve core act flexibly in the valve sleeve. When disassembling, attention should be paid to the assembly sequence of each component and the external wiring position, so that the reassembly and wiring are correct, and the lubricating oil spray hole of the lubricator should be checked whether it is blocked and whether the lubricating oil is sufficient.

4. Air leakage: 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 slide valve is worn and several cavities are channeled. When dealing with the solenoid valve failure of the switching system, the appropriate time should be selected, and the solenoid valve should be dealt with when the power is lost.

Rexroth solenoid valves are common faults

Rexroth solenoid valves are common faults

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