Fault performance and maintenance method of one-way valve
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Release Time：2018-03-19
The failure of the one-way valve is always on and always off in two forms. Always on will cause refrigeration normal, but the compressor running time is too long. Always cut off will cause the refrigerant not to flow, not cooling. The common faults of the one-way valve mainly include blockage, lax closing, leakage and so on. Check valve maintenance method When the nylon valve body in the valve is dirty and does not move, or the bypass capillary integrated with it is also dirty and blocked, it will cause poor cooling or heating effect, or even no cooling or heating. For this kind of fault, a new one-way valve of the same type is used to replace the fault valve. At the same time, nitrogen must be filled after cleaning the refrigeration system.
The failure of the one-way valve is always on and always off in two forms. Always on will cause refrigeration normal, but the compressor running time is too long. Always cut off will cause the refrigerant not to flow, not cooling.
The common faults of the one-way valve mainly include blockage, lax closing, leakage and so on.
Check valve maintenance method
When the nylon valve body in the valve is dirty and does not act, or the bypass capillary tube integrated with it is also dirty and blocked, it will cause poor cooling or heating effect, or even no cooling or heating.
For this kind of fault, the new check valve of the same type is used to replace the fault valve. At the same time, the refrigeration system must be filled with nitrogen after cleaning and decontamination. When replacing the valve body, it must be noted that the refrigerant flow mark arrow of the one-way valve is upward. When welding, attention should be paid to cooling the valve body to prevent the deformation of the nylon valve needle in the valve body, resulting in poor heating effect. For the spherical check valve, if you touch the inlet end of the check valve at the moment of shutdown with a sense of temperature or listen to the sound of air flow, it means that the valve ball and the inlet end are not tightly sealed. In this case, the available alcohol cleaning with nitrogen blowing dry method troubleshooting, once invalid, should be replaced with a new one-way valve. For the newly replaced one-way valve or the original one-way valve of the system, the sealing and polarity inspection method is: vertically shake the one-way valve body (there is a collision sound)After the valve heart ball falls, the upper port end is unblocked, and the other end is the lower port end. It is normal that the suction at the lower port does not pass, otherwise it is out of order and should be replaced.
In addition, when the air conditioner heating operation heating effect is poor, it can not reach (normal)High pressure under working conditions. However, in the refrigeration operation state, the operation of low pressure and refrigeration effect are normal, in the exclusion of other parts of the refrigeration system after failure, mostly the one-way valve closed is not tight. At this time, under the action of high pressure, the refrigerant is released by the gap between the nylon valve needle and the valve seat, so that the return refrigerant does not all enter the capillary tube integrated with the one-way valve. In order to ensure the effect of heating, it is best to replace the check valve.
Another common fault of the one-way valve is the leakage point problem, which is mostly caused by poor welding during manufacturing or maintenance, resulting in fluorine leakage. Leakage points mostly appear at the capillary welding place, and welding should be carried out again.
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