How to correctly install and maintain a two-position two-way solenoid valve?

1. Installation steps

Pre-installation inspection

Confirm the model specifications: Check whether the voltage (AC/DC), pressure range, and media compatibility (oil, water, gas, etc.) of the solenoid valve meet the system requirements.

Check the integrity of the valve body: Make sure that the solenoid valve has no transportation damage, the coil is not loose, and the sealing surface has no scratches.

Clean the pipeline: Flush the pipeline before installation to prevent welding slag and impurities from entering the valve body and causing blockage or wear.

Installation direction

Pay attention to the flow direction: Most two-position two-way solenoid valves have flow direction markings (such as arrows) and must be installed in the direction of the medium flow, otherwise it may affect the sealing or flow.

Recommended installation posture:

Horizontal installation (coil facing up) is the best way to avoid impurity accumulation affecting the movement of the valve core.

Vertical installation (media flow from bottom to top) is also feasible, but impurity deposition must be prevented.

Avoid inverted installation (coil facing down), otherwise it may cause the valve core to jam or leak.

Connection method

Threaded connection: Use raw tape or sealant (PTFE) to ensure sealing, but avoid excessive clogging.

Flange connection: Check the flatness of the flange surface and use appropriate gaskets to prevent leakage.

Quick-plug connection: Ensure that the clamp or ferrule is firmly installed to prevent loosening.

Electrical wiring

Check voltage: Confirm that the solenoid valve coil voltage (such as 24V DC, 220V AC) matches the power supply.

Correct wiring:

Use appropriate wires to avoid heating or insufficient voltage caused by too thin wires.

Tighten the wiring terminals to prevent poor contact or short circuit.

Waterproof and dustproof: If used in a humid or dusty environment, it is recommended to install a protective cover.

Debugging test

Manual test (if there is a manual switch): Manually operate first to confirm that the valve core moves smoothly.

Power-on test: Power on for a short time to observe whether the valve opens and closes normally, and whether there is abnormal noise or heat.

Pressure test: Gradually increase the system pressure to check for leaks.

2. Daily maintenance

Regular inspection

Coil status: Check whether it is overheated (normal temperature rise ≤ 60℃), whether there is a burning smell or discoloration.

Seal inspection: Observe whether there is leakage at the valve body and interface.

Action test: Regularly power on the test to ensure that the valve responds quickly and without jamming.

Cleaning and anti-blocking

Cleaning the valve body: If the medium contains impurities, regularly disassemble and clean the valve core and valve seat to prevent clogging.

Filter protection: Install a filter (such as a 100μm filter) at the front end of the solenoid valve to reduce the impact of particulate matter.

Common fault handling

Long-term maintenance

If not used for a long time, it is recommended to drain the medium to prevent corrosion or freezing (such as winter antifreeze of water valves).

Perform manual operation regularly to prevent the valve core from sticking.

3. FAQs about 2/2-way solenoid valves

• What is a two-position two-way solenoid valve?

Definition: A two-position two-way solenoid valve is an automation component that controls the flow of fluid through electromagnetic force. It has two working states ("open" and "closed") and two channels (one inlet and one outlet).

Core components: including valve body, valve core, electromagnetic coil, spring, etc. The valve core is made of magnetic material. When energized, it moves under the action of the magnetic field and changes the state of the fluid passage.

• What is the working principle of a two-position two-way solenoid valve?

Direct-acting type: When energized, the coil generates electromagnetic force to directly lift the valve core to open the valve; when the power is off, the spring resets and closes the valve. It is suitable for low-pressure and small-diameter (≤25mm) scenarios.

Step-by-step direct-acting type: Combining the direct-acting and pilot-operated principles, it assists the main valve action through the pressure difference, which is suitable for working conditions with pressure difference.

Working mode:

Normally closed type (NC): closed by default, open when energized.

Normally open type (NO): open by default, closed when energized.

• What are the application scenarios of two-position two-way solenoid valves?

Hydraulic/pneumatic control: used for on/off switching of oil or gas circuits, such as air compressor and cylinder control.

Chemical and industrial automation: regulate the flow of gas, liquid or steam to achieve automatic control of production lines.

Refrigeration system: control the flow direction of refrigerant (such as switching of refrigerator evaporator).