Check valve fault phenomena are always connected and always as two forms. Always connect will cause the refrigeration is normal, but the compressor running time is too long. As always leads to refrigerant flow, no refrigeration. Check valve mainly include jams, closed lax, the common failures appeared funnelled, etc. Check valve maintenance method when the nylon inside the valve body dirty plugging, no action, or with the integration of the by-pass capillary it dirty plugging, can cause cooling or heating effect is poor, not even cooling or heating. For this kind of failure, more new model of one-way valve is used to replace the fault valve, at the same time must to cleaning after filling nitrogen refrigeration system for decontamination. Must pay attention to when to replace the valve body, Industrial Valves refrigerant flow arrow up, welding cooling should be paid attention to the body, prevent the valve body of nylon needle deformation, cause heating effect is poor. For ball check, if the downtime instant touch one-way valve inlet side has a warm feeling or to listen to angry LiuSheng, explain the inlet valve ball and untight seal. In this case, can use alcohol to clean with nitrogen blow drying methods troubleshooting, once ineffective, a new check valve should be replaced. Or system for new in the original one-way valve, the sealing and polarity test method is: the vertical shaking a one-way valve ( Have a touch attack) , after the valve core ball drop, inspiratory flow is easy to end, the other end to end. The end inspiratory impassability is normal, whereas for failure, should be replaced. In addition, when run air conditioner heating heating effect is poor, the short of ( Normal) The working status of high pressure. But under refrigeration operation state, the low pressure and cooling effect all normal operation, and after rule out other refrigeration system component failure, much as one-way valve closed imprecise. When the refrigerant under high pressure, the nylon needle valve and valve seat asked gap discharge, and check valve backflow refrigerants not all into the one of the capillary. In order to guarantee the effect of heating, it is better to replace the check valve. Another common fault of check valve is funnelled problem, the failure is caused by improper manufacturing or repair welding more, produce fluorine leakage phenomenon. Funnelled more appear in the capillary, welds shall be welded again.
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