4WEH16 electro-hydraulic reversing valve installation steps and precautions

4WEH16 electro-hydraulic reversing valve installation steps and precautions

1. Installation steps

Basic preparation and component inspection

Confirm the integrity of the equipment: Check whether the valve body, main valve core, return spring, pilot solenoid valve (including electromagnet), seals and other components of the 4WEH16 electro-hydraulic directional valve are complete, and check whether the model and specifications match.

Clean the installation environment: Make sure the installation site is flat and free of debris to avoid vibration or impact that affects the stability of the equipment.

Check the hydraulic system: Confirm that the cleanliness of the hydraulic oil meets the requirements (filtration accuracy is at least 20 μm) to avoid impurities entering the valve body and causing wear or stuck.

Main structure installation

Installation method selection:

Horizontal installation is preferred: keep the valve body axis horizontal and avoid tilted or vertical installation (unless the model explicitly allows it).

Fixing of the connecting base plate: Use the specified screws to fix the valve body on the connecting base plate, ensuring that the roughness of the joint surface is ≤ Ra0.8 and the flatness is ≤ 0.01mm/100mm to prevent oil leakage or vibration.

Electrical connection:

Select the electrical connection method (individual or centralized) according to the solenoid valve type (wet AC or DC), and ensure that the wiring is firm and the thread ends are clean.

If manual emergency operation is required, install a solenoid valve with a manual button and test the button function.

Hydraulic system connection

Pipe cleaning: Thoroughly clean the hydraulic pipes before installation to ensure that no impurities remain.

Confirmation of medium flow direction: The direction of the arrow on the valve body must be consistent with the flow direction of the hydraulic oil to avoid reverse pressure difference causing the valve core to become stuck.

Control oil circuit configuration:

Internal control: The pilot valve is supplied with pressure oil through the main valve (suitable for scenarios where the system has fewer electro-hydraulic valves and a simple structure).

External control: The pilot valve is supplied through an independent oil source (suitable for scenarios where there are many electro-hydraulic valves in the system or precise control is required).

External oil return: The oil return port controlled by the pilot valve needs to be led out separately and returned directly to the oil tank.

Functional debugging and testing

Initial position check: Before powering on, confirm that the main valve core is in the middle position of spring or hydraulic centering (when powered off).

Reverse test:

Energize the electromagnet and observe whether the main valve core moves smoothly and whether the oil port is connected correctly (such as P→B, A→T).

After the power is cut off, the main valve core should automatically reset to the middle position, and the oil in the spring chamber will be discharged back to the tank through the pilot valve.

Parameter adjustment:

If you need to adjust the reversing time or main valve stroke, install a reversing time regulator or stroke regulator.

Test the main spool end position indicator or switch function (if equipped).

2. Precautions

Hydraulic oil management

Oil selection: Select hydraulic oil strictly according to the manufacturer's regulations to avoid using inferior or contaminated oil.

Liquid level control: Regularly check the liquid level in the fuel tank to avoid emptying caused by low liquid level or overflow caused by high liquid level.

Oil temperature monitoring: Ensure that the oil temperature is within a reasonable range (usually 40-60°C) to avoid high temperature causing seal aging or low temperature causing excessive oil viscosity.

electrical safety

Voltage stability: Ensure that the power supply voltage fluctuates within ±10% of the rated voltage to avoid excessive voltage burning the coil or too low voltage causing the solenoid valve to malfunction.

Moisture-proof and dust-proof: The solenoid valve coil needs to be moisture-proof to prevent rain or condensation water from entering and causing a short circuit; the coil shell needs to be cleaned regularly to prevent dust accumulation from affecting heat dissipation.

Grounding protection: The electrical system needs to be reliably grounded to prevent safety accidents caused by static electricity or leakage.

Sealing and leak proof

Seal inspection: Check whether the seal is intact before installation. If damaged, replace it in time; avoid scratching or twisting the seal during installation.

Connection and tightening: Regularly check whether the connecting screws between the valve body, pipes, and bottom plates are loose. If they are loose, tighten them in time.

Leakage treatment: If external leakage is found (such as oil leakage at joints), the joints need to be tightened or seals replaced; if internal leakage is found (such as oil leakage caused by valve core wear), the valve core needs to be disassembled and repaired or replaced.

Maintenance and maintenance

Regular cleaning: According to the frequency of use, clean the impurities inside the valve body regularly (such as once every six months or once a year) to prevent the valve core from getting stuck.

Replace wearing parts: Regularly replace seals, return springs and other wearing parts (such as once every 2-3 years) to ensure stable equipment performance.

Lubrication management: If the valve core adopts a sliding friction structure, grease (such as lithium-based grease) needs to be applied regularly to reduce wear.

Security protection

Static discharge: During the process of hydraulic oil transportation and pipeline connection, an electrostatic discharger needs to be installed to avoid fire or explosion caused by static electricity.

Guards: Install guardrails or shields around equipment to prevent operators from coming into contact with moving parts or hot surfaces.

Emergency operation: Be familiar with the manual emergency operation process (such as switching the valve core position through a manual button) so that you can handle it promptly in the event of a power outage or malfunction.