A

Problem Phenomenon:
The solenoid valve opens normally after installation, but after a few seconds (or several seconds), it gradually closes on its own, and the flow rate decreases.

Cause Analysis:
1️⃣ Unstable pipeline pressure.
2️⃣ Voltage fluctuations causing an uneven magnetic field.

Solution:
1️⃣ Implement pressure stabilization in the pipeline.
2️⃣ Place a shim under the coil to raise it by 3–5 mm, shifting the magnetic field upward.

A

Problem Phenomenon:
The solenoid valve opens normally after installation, but after a period of operation, it fails to open.

Cause Analysis:
The coil has burned out due to prolonged or excessively frequent energizing.

Solution:
Replace the coil.

A

Problem Phenomenon:
The solenoid valve fails to open immediately after installation.

Cause Analysis:
1️⃣ Incorrect voltage – Too high voltage can burn out the coil immediately.
2️⃣ Excessive pipeline pressure – The magnetic force generated by the coil is insufficient to move the valve.

Solution:
1️⃣ Replace the coil.
2️⃣ Use a coil rated for higher voltage or shorten the internal spring by 3 turns.

A Problem Phenomenon:

The solenoid valve works normally after installation, but after a period of operation, it fails to close.

Cause Analysis:

1️⃣ Dirt or debris has accumulated in the solenoid valve’s internal orifices or at the valve seat seal.

2️⃣ The diaphragm or piston is damaged.

Solution:

Replace the diaphragm or piston.

A Problem Phenomenon:

The solenoid valve was just installed, and it hasn’t closed even once.

Cause Analysis:

There is back pressure at the solenoid valve outlet, or dirt/debris has entered the valve inlet.

Solution:

Install a check valve at the outlet or a filter at the valve inlet.

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