The maintenance

1. Precautions for use

1. It is recommended that the user assign special personnel to be responsible for, use and maintenance.

2, use the process of failure by our company designated special after-sales service personnel to provide on-site service, without our permission shall not be dismantled.

3, the solenoid valve should be repaired and maintained 1-2 times a year, to eliminate the dust, dirt and other impurities deposited, the replacement of o-ring and other wearing parts.

4. If the solenoid valve is stopped for a long time after installation, it should be operated for about 1 time in half a year and handled in time when problems are found.

5. Before maintenance, the power supply must be cut off and the medium pressure removed.

6, maintenance of the electromagnetic valve to be removed, should be by the use of the department of technical responsible person and our company's technical personnel after communication, under the guidance of our company's professional personnel.

7. When disassembling the solenoid valve for cleaning, all parts should be put in order, and interference fitting parts or bonding parts shall not be disassembled.

8. After being dismantled, metal parts and oil-resistant rubber parts can be cleaned with kerosene or trichloroethylene, and ordinary rubber parts and plastic parts can be wiped with clean cotton yarn.

9, installation according to the reverse order of disassembly, O ring outer circle and other parts of the contact surface coated with lubricating oil, not strong percussion. Be careful not to leak seals and fasteners.

10, the product in the use of abnormal sound, movement should stop working, immediately analyze the cause and take appropriate measures, do not make the equipment sick operation.


Two, solenoid valve fault analysis and processing

The fault phenomenon

Cause analysis,

Processing method

No action when energized

Poor contact of power cable


The coil is short-circuited or burnt out


Rectifier bridge breakdown


The power supply voltage variation exceeds the permitted range

Connect the power cord


Replace the coil


Replace the rectifier bridge


Adjust voltage within normal working range

When the valve is opened, the medium cannot pass or the flow is insufficient

Medium pressure or working pressure difference is not consistent




There are impurities and dirt around the guide sleeve or moving iron core and the guide valve hole is blocked


Valve front strainer blocked


Before valve manual valve close or pressure box cut off valve overpressure cut off


The working frequency is too high


The diameter of design selection is too small

Adjust the pressure or working pressure difference, select the appropriate pressure parameters of the product


Clean internal parts and install strainer before valve




Clean the filter screen


Before opening the valve manual valve, reset the pressure box cut-off valve




Change product specifications or replace new products


Replace with appropriate specifications and models



The medium can not be cut off when the valve is closed

Medium pressure and working pressure difference are inconsistent




Fluid viscosity does not meet requirements


Seat defect or adhesion dirt


Balance hole or throttle hole is blocked


The spring deforms or comes out of the spring seat




The working frequency is too high

Adjust the pressure or working pressure difference, select the appropriate pressure parameters of the product


Replace the appropriate product


Clean, grind or replace


Disassemble and clean internal parts


Add gasket, replace the spring, the spring in the spring seat reset


Replace the suitable specifications and models

Emergency cut-off solenoid valve after closing the valve reset is not reliable

Spring deformation


The stem limit card slot is damaged


The non-magnetic tube assembly is loose

Add gasket or replace spring


Replace with a new stem


Tighten the thread of the non-magnetic tube assembly


The connection of the component is loose


The o-ring at the connection is damagedBody corrosion appears trachoma

Tighten connection bolts or threads


Replace the O-ring sealRepair or replace new valve body with foundry glue

Serious internal leakage

Guide seat, main seat defective


Guide seat, main seat and disc surface impurities, dirt


Improper spring assembly or deformation


The valve disc fastening nut is loose


The moving iron core fastening nut is loose


Stem is bent and deformed

Clean, grind or replace


Remove and clean seat and disc




Reassemble or replace the spring


Tighten the disc fastening nut


Tighten the moving core fastening nut


Replace with a new stem

Too much noise during power on

The fastener of the magnetic head is loose


The non-magnetic pipe fitting of the cut-off valve is loose


Medium pressure and working pressure difference are inconsistent


Fluid viscosity does not meet requirements


Voltage fluctuation exceeds allowable range

Tighten the fastening bolt


Tighten the thread of the non-magnetic tube assembly


Adjust pressure, working pressure difference or replace suitable products


Replace the product with the appropriate model


Adjust voltage to normal working range