Installation method of 4WEH16 electro-hydraulic reversing valve

4WEH16 electro-hydraulic reversing valve is a reversing valve that combines electromagnetic control and hydraulic drive. It is widely used in industrial hydraulic systems and is used to control the flow direction, pressure or flow rate of oil. Its installation must strictly follow specifications to ensure stable performance and avoid leakage or failure. The following are the detailed installation steps and precautions:

1. Preparation before installation

Environmental inspection

Cleanliness: The installation area must be free of dust, oil, metal chips and other impurities to avoid entering the valve body and causing stagnation or wear.

Temperature and humidity: The ambient temperature should be between -10℃~+50℃, and the humidity should be ≤85%, to prevent electrical components from getting damp or hydraulic oil from solidifying.

Vibration and impact: Avoid installation near vibration sources (such as motors, pumps) to prevent valve core from being offset or damaged due to vibration.

Equipment inspection

Valve body appearance: Check that the valve body, solenoid, pilot valve and other components are free of cracks, deformation or bump damage.

Seals: Make sure that O-rings, gaskets, etc. are not aging or damaged, and replace new parts if necessary.

Electrical interface: Check that the solenoid terminals are not loose or oxidized, and the cable insulation layer is intact.

Tools and materials preparation

Tools: Allen wrench, torque wrench, sealant, cleaning cloth, hydraulic oil.

Materials: System-compatible hydraulic oil (such as ISO VG46 anti-wear hydraulic oil), threaded sealant (such as Loctite 542).

2. Installation steps

1. Valve body fixation

Installation direction:

Make sure that the oil port mark (P, T, A, B) on the valve body corresponds to the system pipeline (P is the oil inlet, T is the oil return port, and A/B is the working oil port).

The valve body can be installed horizontally or vertically, but the solenoid must be avoided from facing downwards (to prevent oil from seeping into the interior of the solenoid).

Fixed method:

Use M6 or M8 bolts to fix the valve body to the mounting plate, and the bolt torque must meet the specifications (usually 10~12N·m).

If it is stacked installation, stacked gaskets need to be installed between the valve body to ensure that the sealing surface is flat.

2. Pipeline connection

Oil port docking:

Use a high-pressure hose or hard pipe to connect the valve body oil port and the system pipeline. The end of the pipeline needs to be flared or fitted (such as JIC connectors).

Apply a small amount of hydraulic oil to lubricate the threads when connecting to avoid dryness and damage to the seal.

Sealing treatment:

Wrap the raw tape (2~3 turns) at the thread or apply thread sealant to prevent leakage.

When connecting the hard tube, use a clamp connector and pre-tighten to the specified torque (such as 16~18N·m).

Avoid stress:

The pipeline must have an appropriate bending radius (≥5 times the pipe diameter) to avoid forced stretching or twisting of the valve body, resulting in internal leakage or valve core stagnation.

3. Electrical connection

Electromagnet wiring:

Connect the power supply according to the electromagnet logo (such as DC24V, AC220V), pay attention to the positive and negative polarity (DC models must be strictly distinguished).

Use a waterproof connector or cable sheath to protect the terminals from intrusion of oil or moisture.

Ground protection:

Connect the solenoid housing to the grounding end of the equipment to avoid static electricity or leakage causing failures.

Pilot valve control (if applicable):

If the 4WEH16 has a pilot control function, it needs to be connected to the pilot oil source (usually a P port or an independent pump source), and the pressure must meet the valve body requirements (such as 1~3MPa).

4. Debugging and checking

Manual operation test:

When the power is not on, use a manual lever (if equipped) to ensure that the valve core is flexible and has no jamming.

Power-on test:

The low voltage (such as 12V) is temporarily energized, and observe whether the electromagnet is fast and has no abnormal noise.

Gradually increase to the rated voltage, check whether the valve core reversal is stable and whether the return spring force is sufficient.

Leak Check:

Start the hydraulic pump and slowly increase the pressure to the system working pressure (such as 16MPa) to observe whether there is leakage at each connection.

Apply soapy water to seal the surface to check for any bubbles (confirm the leak point).

3. Installation precautions

Anti-pollution control

Before installation, flush the inside of the valve body and the pipeline with hydraulic oil to remove impurities.

Avoid direct contact with precision components such as valve cores and sealing surfaces with your hands to prevent sweat corrosion.

Temperature and pressure matching

Ensure that the hydraulic oil temperature is between 40℃ and 60℃ (avoid excessive low-temperature viscosity or high-temperature oxidation).

The system pressure must not exceed the rated pressure of the valve body (4WEH16 is usually 31.5MPa) to prevent the valve body from bursting.

Maintenance and maintenance

Check the suction force of the solenoid regularly (such as once a year), and replace the coil or spring if it is weakened.

Replace the hydraulic oil filter element every 500 hours to prevent impurities from entering the valve body.

When discontinued for a long time, the valve body must be immersed in anti-rust oil or filled with hydraulic oil to prevent internal corrosion.