What issues should be paid attention to when using 4WE10 single-head solenoid reversing valve

As an electromagnetically driven hydraulic control component, the 4WE10 single-head solenoid reversing valve needs to focus on six core links: installation specifications, oil cleanliness, electrical matching, pressure flow control, operation interlocking and maintenance. The specific precautions are as follows:

1. Installation specifications: Ensure structural stability and sealing

Horizontal installation requirements

The valve body axis must be kept horizontal to avoid vertical installation causing reversal or resetting of parts such as valve cores and armatures to be affected by self-weight. For example, if installed vertically, the valve core may not be fully reset due to gravity, causing internal leakage or action stagnation.

Installation surface flatness

The surface of the installation base plate needs to be ground and the flatness error does not exceed 0.05mm to prevent the valve body from deforming due to the protrusion of the installation surface, which will cause the valve core to be stuck or seal failure.

The connection screw is subjected to uniform force

When fixing the connecting screw, it is necessary to tighten symmetrically to avoid deformation of the valve body due to one-sided stress. There have been cases where the screw tightening force is uneven, resulting in the gap between the valve core and the valve body hole shrinking, causing hydraulic clamping.

2. Oil cleanliness: prevent impurities from getting stuck in the valve

Filtration accuracy requirements

Hydraulic oil needs to be filtered by a filter with a filter accuracy of ≤10μm to prevent impurities such as iron filings and colloids from entering the gap between the valve core and the valve body hole (usually only 0.006~0.015mm). A customer reported that the solenoid valve was frequently stuck. After inspection, it was found that there were a large amount of iron filings in the valve body, which was caused by the failure to completely clean the oil pipe.

System cleaning process

Before assembly, air guns must be used to blow the oil pipe, pipe joints, oil tanks and internal debris inside the valve block, and ultrasonic cleaning of the valve block. If the cleaning is not thorough, impurities may enter the solenoid valve with the oil, causing the valve core to be blocked.

3. Electrical matching: Avoid coil burning

Voltage consistency

The voltage used must be consistent with the coil rated voltage (such as DC24V, AC220V). If the voltage is misconnected, the coil may be burned due to overheating; if the voltage is too low, the solenoid suction is insufficient, resulting in the valve core reversal inadequate.

Electromagnet type selection

Choose a wet AC or DC solenoid according to the power supply type. Wet electromagnets are suitable for high-frequency commutation scenarios, and their heat dissipation performance is better than dry electromagnets and can extend their service life.

4. Pressure flow control: prevent poor operation

Rated parameter limits

The use pressure shall not exceed the nominal rated pressure of the valve body (such as 31.5MPa), and the flow rate shall not exceed the rated flow rate (such as 100L/min). If the limit is exceeded, it may cause problems such as hydraulic clamping and hydraulic power impact, resulting in slow or stuck valve core movement.

Back pressure limit for oil return port

The pressure of the oil return port T should usually not exceed 6.3~7.0MPa. If the back pressure of the system is too high, a back pressure valve must be installed on the oil return pipeline to prevent abnormal return of the valve core.

5. Operation interlock: Avoid electromagnet conflicts

Double electromagnet interlocking

If the solenoid valve is equipped with double solenoids, the electronic control system needs to design an interlocking function to prevent the two solenoids from being energized at the same time. For AC solenoids, power-on at the same time will cause the coil to overheat and burn; for DC solenoids, it may cause uncertainty in the valve core position, resulting in malfunction of the system.

Manual emergency switch

If the solenoid valve supports manual operation, the flexibility of the manual button or screw needs to be checked regularly to ensure that the solenoid can be switched to manual mode quickly in the event of a failure.

6. Maintenance: Extend service life

Regular inspection and cleaning

Check the solenoid coil, valve body and pipeline every 500 hours to remove surface contaminants. If the working environment is harsh (such as humid and dusty), the inspection cycle must be shortened to 200 hours.

Temperature control

Avoid long-term operation of the solenoid valve in high temperature (>70℃) or low temperature (<-30℃). High temperatures may cause the seal to age, and low temperatures may cause increased oil viscosity and increase valve core movement resistance.

Protection device configuration

Filters are installed at the inlet of the solenoid valve and mufflers are installed at the outlet to reduce impurities entering and fluid shock noise. At the same time, an overcurrent and overheating protection device is provided to prevent the electromagnet from being damaged due to overload.