fault

Root cause analysis

exclusion method

Can't open

The normally closed solenoid valve has a power failure or excessive fluctuation when connected to the power supply

Check and eliminate power supply faults

The working voltage of the electromagnetic drive device for normally closed solenoid valves does not match the actual voltage

Replace the electromagnetic drive device with consistent voltage

Actual work pressure exceeds the pressure determined in the contract

Replace the solenoid valve with one that matches the actual working pressure

The viscosity of the actual working medium is too high

Choose other valves

The actual working medium temperature exceeds the contractually determined value

Replace the solenoid valve with a temperature consistent with the actual working medium

Electromagnetic device damaged

Repair or replace

Electromagnetic device controller (box) malfunction

Repair or replace

The valve internals are stuck by foreign objects

Clean the valve internals

Damaged auxiliary valve cup or blocked pilot hole

Repair or replace the auxiliary valve cup, clean the pilot hole

Failure to activate auxiliary spring

replace the spring

Excessive wear of valve cup and cylinder liner leads to excessive clearance

Replace the valve cup or cylinder liner

I can't turn it off

The normally open solenoid valve has a power failure or excessive fluctuation when connected to the power supply

Check and eliminate power supply faults

The working voltage of the electromagnetic drive device for normally open solenoid valves does not match the actual voltage

Replace the electromagnetic drive device with consistent voltage

Actual work pressure exceeds the pressure determined in the contract

Replace the solenoid valve with one that matches the actual working pressure

The viscosity of the actual working medium is too high

Choose other valves

The actual working medium temperature exceeds the contractually determined value

Replace the solenoid valve with a temperature consistent with the actual working medium

Electromagnetic device damaged

Repair or replace

Electromagnetic device controller (box) malfunction

Repair or replace

There are foreign objects in the gap between the valve components

Clean the valve internals

Damaged valve cup seal or diaphragm

Replace the seal or diaphragm

Close auxiliary spring failure

replace the spring

Installation direction incorrect

Install in the direction indicated by the valve body flow direction

The medium has repeated bidirectional pressure

Select bidirectional solenoid valve

abnormal noise

There are foreign objects inside the valve

Clean the valve internals

The driving iron core cannot be * attracted

Repair and adjust

Low traffic

Insufficient valve cup travel

readjust

Insufficient suction of electromagnetic device

readjust

Insufficient pressure difference, main valve cup cannot be opened *

Select direct acting solenoid valve