How to maintain 4WEH16 electro-hydraulic reversing valve

The maintenance of 4WEH16 electro-hydraulic directional valve needs to start from many aspects such as installation, hydraulic system, electrical connection, sealing and tightening, safety protection and daily use, as follows:

Installation and location:

The electro-hydraulic directional valve should be installed on the connecting base plate using the specified screws. Pipes are not allowed to support the valve.

During installation, the axis must be kept horizontal, and tilted and vertical installations are not allowed to ensure normal operation.

The surface roughness of the joint surface between the base plate and the valve should be guaranteed to be within a certain range, and the flatness should be less than 0.1mm to ensure sealing performance.

Hydraulic system maintenance:

Hydraulic oil selection: Hydraulic oil must be selected strictly in accordance with the standards and parameters specified by the manufacturer, and must undergo rigorous filtration tests with a filtration accuracy of at least 20 μm to ensure that the hydraulic valve can operate normally. If there are impurities in the hydraulic system, it will affect the life of the reversing valve and even cause damage.

Liquid level inspection: Pay attention to the inspection and control of the liquid level. When the working liquid level of the reversing valve exceeds the tolerance or the remaining amount reaches the standard, technicians need to be notified for maintenance to avoid potential failures caused by poor liquid level.

Back pressure valve setting: For the initial neutral slide valve function, when the internal control type is used for the electro-hydraulic directional valve (such as M type, H type, K type, etc.) to unload the hydraulic pump, a back pressure valve with an opening pressure above 1Mpa should be installed on the return line of the main valve to ensure the reversing action of the main valve core.

Electrical connection:

Pay attention to the quality of electrical wiring. Once there is a problem with the wiring, it may affect the normal operation and operation of the entire system.

In order to avoid electrical problems or malfunctions, it is necessary to indicate the wiring sequence of the reversing valve and keep the wire ends clean.

The pilot solenoid valve can choose wet AC or DC electromagnet. There are two types of electrical connection: independent type and centralized type, which need to be selected according to the actual situation.

Seals and Fasteners:

Reasonable arrangement and layout of seals, fasteners, etc. should be carried out, and abnormal situations discovered during the transportation or use of hydraulic valves should be analyzed and effective measures should be taken to solve them to avoid unnecessary losses.

Regularly check the status of seals and fasteners. If they are worn or loose, they should be replaced or tightened in time.

Security protection:

Pay attention to whether safety protection work is done well. You must know that static electricity is easily caused during the transportation of hydraulic oil and pipeline connections, and static electricity can also easily cause certain destructive effects on hydraulic valves.

Therefore, it is necessary to install some safety fire protection equipment such as electrostatic dischargers to ensure the safe operation of the equipment.

Daily use and maintenance:

If any spool-type electro-hydraulic reversing valve remains in the reversing state under pressure for a long time, it may cause dirt or hydraulic clamping due to the formation of liquid deposits, making the valve core difficult to move. Therefore, pay attention to the oil contamination and filtration conditions, and regularly reverse the direction to clean the valve core and valve body.

If the working fluid used is not mineral oil, a valve type that can meet the requirements should be selected, and the temperature of the working fluid should be paid attention to. Generally speaking, the working temperature range of mineral oil is -20~80℃, and the working temperature range of aqueous liquid is 10~54℃. Except for aqueous liquid, the normal oil temperature is 65℃.

The oil drain port cannot be connected to a pipeline that will generate impact pressure. The end of the return tank pipeline must be inserted into the oil to prevent impact pressure.