How to repair the solenoid valve failure of the cooling water system?

When the cooling water system is running, if it encounters a solenoid valve failure, it will affect the flow, speed and normal use in the refrigeration system. What should I do if I encounter a solenoid valve failure?

Solenoid valve coil short circuit

When the cooling water system is switched to heating operation, the current of the solenoid valve coil is too large due to a short circuit. In severe cases, the fuse on the main control board is burned out or the trip is caused, resulting in the whole machine not working properly.

Solenoid valve slider deformation

If the solenoid valve slider of the cooling water system is deformed, even if the solenoid valve coil is energized, the pilot valve core will not move, causing the slider to be misaligned, causing the internal gas of the valve body to collide, and the high pressure gas in the compressor forms a short cycle. , causing high temperature, high pressure, until frequent thermal protection, after burning the compressor insulation. For the entire cooling water system, the high pressure of the shutoff valve leaks to the low pressure end, reducing the high / low pressure difference. Often expressed as no cooling, no heating or poor results.

Solenoid valve does not work after power on

Remedy: Check if the power supply wiring is bad → re-wiring and connector connection; check whether the power supply voltage is within the ± working range - → adjust the normal position range; whether the coil is desoldered → re-weld the coil short-circuit → replace the coil; Inappropriate → adjust the differential pressure → or replace the proportional solenoid valve; the fluid temperature is too high → replace the proportional solenoid valve; there are impurities to make the main valve core and the moving iron core of the solenoid valve jam → clean , if there is seal damage should be replaced Seal and install the filter; the viscosity of the liquid is too high , the frequency is too high and the life is up to → replace the product.

Solenoid valve cannot be closed

Remedy: The seal of the main spool or the iron core has been damaged → replace the seal; the temperature and viscosity of the fluid are too high → replace the solenoid valve of the opposite port; there is impurity into the solenoid valve of the cooling water system to produce the valve core or moving iron core → Cleaning; spring life has been or deformed → replacement; orifice balancing hole blockage → timely cleaning; working frequency is too high or life has arrived → re-election of products or product updates.

Solenoid valve does not reverse

If the solenoid valve or the slider does not move and is fixed in one position, the air conditioner cooling or heating cannot be converted to each other. The most common faults are mostly refrigeration, which can not be heated. At the same time, the air conditioner is protected against blowing cold air. The outdoor unit is running, the indoor unit does not blow hot air, and the fault light is displayed and stopped.

This is the repair method for the solenoid valve failure in the cooling water system , hoping to help all friends and users.

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â‘ Hardness:

Due to the scientific synthesis of high-molecular polyurethane elastomer materials using iron rubber, the higher the hardness, the higher the modulus, the smaller the elongation, and the better the wear resistance and heat resistance. Well, in the range of minus 35 degrees Celsius to 100 degrees Celsius, and at a pressure of 60 to 70 MPa, the maximum sealing performance can be guaranteed.

The use of viscoelastic seals made of nitrile rubber is the most complete protection against damage caused by back pressure. In the range of minus 55 degrees Celsius to 100 degrees Celsius, and under a pressure of 21MPa, due to the rubber The seal is often in a compressed state, so the compression performance of the rubber seal must be considered. It not only achieves enhanced anti-climbing performance and low friction resistance, but also has good performance in dealing with special low-temperature oil, and can also be used in combination with Anti-wear Ring double-purpose retaining ring BRL type.

Sealing products made of polytetrafluoroethylene and nitrile rubber/PTFErubber; or seals made of nylon resin and nitrile rubber, which can be used in a wide range of applications with large pressure changes and fast sliding speeds According to the working condition, the input hydraulic pressure cutout is designed on the end face of the polytetrafluoroethylene ring to prevent penetration leakage. The maximum working temperature environment is minus 40 degrees Celsius to 160 degrees Celsius; the maximum working pressure is 50MPa.

SPGW piston seal

Material:PTFE+rubber elastomer+reinforced modified nylon
Temperature:Nitrile rubber -40~100℃
Speed:=1.0m/s
Pressure:≤50mpa

SPGO piston seal

Material:PTFE+rubber elastomer
Temperature:Nitrile rubber -40~110℃
Speed:=1.0m/s
Pressure:≤35mpa

SRUV piston rod seal

Material:NBR+thermoplastic polyurethane
Temperature: -35`90℃
Speed:=0.5m/s
Pressure:≤40mpa

SRS piston rod seal

Material:PTFE+NBR
Temperature:-40~110℃
Speed:=1.0m/s
Pressure:≤40mpa

SRCB piston rod buffer seal

Material:Polyurethane+modified polyoxymethylene
Temperature: -35~110℃
Speed:=1.0m/s
Pressure:≤50mpa

SRU piston rod seal

Material:Polyurethane
Temperature:-35~100℃
Speed:=1.0m/s
Pressure:≤40mpa

SRD iron case dust prevention

Material:Polyurethane+metal skeleton material
Temperature:-40~110℃
Speed:=1.0m/s

SRDI soft dustproof

Material:polyurethane
Temperature:-40~110℃
Speed:=1.0m/

SDS Dumbbell Seal

Material:polyurethane
Temperature: -35~110℃
Speed:=0.5m/s
Pressure:≤50mpa

SPG piston combination seal

Temperature:

Temperature:-35`110℃

Speed:=0.3m/s

Pressure:≤70mpa

SRNL piston rod seal

Material

Temperature:-35`110℃

Speed:=0.3m/s

Pressure:≤70mpa

SRDF Piston Rod Seal

Material

Temperature:-40`100℃

Speed:=1.0m/s

SDY Y-seal

Material:Polyurethane

Temperature:-35~110℃

Speed:=0.5m/s

Pressure:≤70mpa

KZT anti fouling ring

SDS Steffel

Piston main oil seal

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