Specific maintenance operation of 4WE10 solenoid reversing valve

The specific maintenance operations of 4WE10 solenoid reversing valve are as follows:

Check before installation:

Check whether the model and parameters on the solenoid valve sign or label are consistent with the ordering time. If there is any error, please contact the supplier immediately.

Read the instruction manual carefully and check whether the actual working conditions on site are within the product range. If the allowable range is exceeded, the installation or use should be stopped immediately and consulted.

Installation operation:

Before installation, flush the pipe with air or water of ≥0.3MPa, remove impurities in the pipe (such as welding slag, sealing residue, dirt, etc.), and then connect the solenoid valve.

Solenoid valves should not be installed in low recesses of the pipeline. If installed in the container discharge pipeline section, the pipeline outlet should be led out slightly above the bottom of the container to avoid impurities deposited at the bottom of the container entering the solenoid valve.

Solenoid valves can generally only be used in one direction and cannot be installed in reverse. The valve body usually has a '→' sign indicating the flow direction of the medium, or the English letter 'IN' indicates the inlet and 'OUT' indicates the outlet, and it needs to be installed in the direction indicated.

When taking the pipe, the sealing material should not be used excessively. For example, when threaded connection, the length of the external thread of the connection pipe should not exceed the effective length of the internal thread of the solenoid valve, and use a file to chamfer the sealing belt at the half pitch of the front end of the external thread to start wrapping the sealing belt from the two threads.

Ensure that the fluid is free of impurities, crystallization, solidification, scaling, and paste, with a viscosity of <22CST, and install a filter on the front end pipe of the solenoid valve. The filter mesh number of mesh of the filter should be ≥60 mesh.

Pay attention to the protection level of the product. Ordinary models cannot be used in flammable and explosive dangerous occasions. IP54 level should not be installed in open air, severe water leakage or splashing places.

The solenoid valve should be installed in a horizontal pipe, the coil should be vertically upward, and should not be installed vertically, otherwise it will cause leakage and affect life.

A certain operating space should be reserved for the installation location of the solenoid valve to facilitate daily maintenance and regular maintenance.

In the case of insufficient steelness of the pipeline or water hammer, it is recommended to fix the pipes in front and back of the valve with brackets or other means to prevent vibration caused by the solenoid valve.

When used in frozen or cold places, heat insulation materials must be used to insulate the pipes and valve bodies or heaters must be installed on the pipes.

Use and maintain:

Before use, you need to understand the type and rated voltage of the solenoid on the solenoid valve, and connect the power supply as required.

Check whether the slide valve function of the solenoid valve meets the requirements. There are differences between formal and reverse installation when leaving the factory. It is necessary to ensure that it is consistent with the requirements when using it.

Pay attention to the cleanliness of the oil. Since the fitting gap between the valve core of the solenoid valve and the valve body hole is small, usually only 0.006~0.015mm, impurities may cause the valve core to become stuck, and the oil filtration accuracy must be strictly controlled. When using solenoid valves with wet solenoids, attention should be paid to the filtration of magnetic material particles.

Do not make the pressure of the solenoid valve return port T exceed the allowable return oil back pressure. For solenoid reversing valves with rated pressures of 21MPa and 31.5MPa, the allowable return oil back pressure of the return oil T of the solenoid oil back pressure is usually only 6.3~7.0MPa. Exceeding this value will affect the reversing and reset performance. When a four-way solenoid valve blocks one or two oil ports, when used as a three-way solenoid valve or a two-way solenoid valve, if the system working pressure exceeds 6.3~7.0MPa, the T port cannot be blocked.

Do not energize the two solenoids of the double solenoid solenoid valve at the same time, otherwise it will cause the coil to heat and burn out or the valve core position to be unfixed, causing the system to malfunction. The two solenoids should be energized for interlocking time.

The maximum flow rate of the electromagnetic reversing valve should generally be within the rated flow range and should not exceed 120% of the rated flow rate, otherwise it will easily lead to excessive pressure loss and cause heat and noise.

Regularly check the solenoid coil, valve body and pipelines to remove pollutants in a timely manner to avoid accelerating wear of impurities.

Ensure the working environment temperature is stable, take cooling measures in high temperature environments, and take warm measures at low temperatures to avoid the impact of extreme temperature changes on the performance of electromagnets and material strength.

Set up an overcurrent and overheating protection device. Once an abnormal situation is detected, protect the solenoid and valve body will be damaged by overload.

Fault analysis and troubleshooting:

After controlling the output power supply, the moving core of the solenoid valve has no sound of being absorbed:

Possible causes: the coil is not connected to the power supply, the power supply is poor or the terminals are loose, the power supply voltage is too high or too low, the coil is broken or short-circuited.

Exclusion method: Use a multimeter or pen to directly detect whether there is electricity at the coil junction box; open the coil junction box and tighten the wire terminal screws; adjust the voltage or add voltage stabilization devices to the power supply and control equipment; buy and replace the coil again.

After power on, the moving core has a sound of engaging, but the solenoid valve is not opened:

Possible causes: fluid exceeds the maximum working pressure or pressure difference, impurities in the moving core and valve are blocked or stuck, long service time or expiration of life.

Exclusion method: Reduce the fluid delivery pressure or add pressure reduction facilities before solenoid valve; remove the solenoid valve to clean, and install a filter in front of the valve; replace a new solenoid valve.

Excessive noise when powered on:

Possible causes: the nut on the top of the coil is loose, the voltage fluctuates beyond the allowable tolerance range, the fluid pressure or pressure difference exceeds the allowable range, and there is debris stuck in the magnet spacer or the movable magnet wicking surface.

Exclusion method: Tighten the nut or add a soft sealing gasket under the coil; adjust the voltage of the power supply or increase the voltage stabilization facility; reduce the fluid output pressure or add a pressure reducing device in front of the solenoid valve; clean the magnet tube and the moving core.

Coil overheating:

Possible causes: too high or too low voltage, fluid temperature or ambient temperature, long-term overload or live use.

Exclusion method: Adjust the voltage of the power supply or increase the voltage stabilization facility; if the temperature rise does not exceed the standard, it is normal, otherwise replace the high-temperature type; choose the energy-saving module, or choose the normally open type for working conditions.

After power is cut off, the solenoid valve cannot be closed or closed without being closed (referring to normally closed type):

Possible causes: fluid viscosity is too high and exceeds the standard, impurities in the moving magnetic core and valve are blocked and stuck, valve core seal is scratched and damaged by hard impurities, return spring deformation or spring fatigue and aging, valve seat adherence to dirt or damaged by hard objects, seal gaskets fall off, defects, deformation, damage, valve core wear, and service life expires.

Exclusion method: Order solenoid valves that are suitable for high viscosity; remove the solenoid valve to clean the inner parts and install a filter in front of the valve; clean impurities, grind the seal surface, replace the seal or valve spool components; correct, stretch the spring or renew the spring; clean impurities and dirt, grind the valve seat; replace the new seal; replace the new valve spool or buy a new solenoid valve.

Solenoid valve leakage:

Possible causes: loose at the connection and damaged seal at the connection.

Exclusion method: Tighten the bolts or tightening nuts in the leakage; remove and replace the seal.