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Supermarket refrigerated showcase check valve disassembly, diagnosis and maintenance
supermarket refrigerated showcase check valve disassembly, diagnosis and maintenance
Only supermarket refrigerated showcases with rotary compressors have check valves.
1. Check valve disassembly. The refrigeration system bleeds one > open the damping mud wrapped around the one-way valve one > remembers the direction of the one-way valve one > wraps the one-way valve with a wet cloth one > has the flame head of the welding torch to heat and weld the two pipes mouth. Installation is the reverse process of disassembly, but please note that the direction of the check valve cannot be reversed. When polishing, the nozzle should be downward, and silver welding rod should be used. Cooling measures should be taken when welding to avoid deformation of the inner nylon parts of the supermarket refrigerated showcase.
2. Check valve diagnosis and repair failure rate is extremely low. There are two forms of damage: always on and always off. Always on will cause the refrigeration to be normal, but the compressor will run for too long: always off will cause the refrigerant to not circulate, supermarket refrigerated showcase non-refrigeration check valve damaged can only be replaced, can not be replaced by copper pipe. The blow-through method diagnoses the one-way valve. When the gas is blown in in the direction of the arrow marked on the one-way valve, there should be gas blowing from the other nozzle. If there is no gas blowing, it is necessary to judge that the one-way valve is always closed. When blowing in gas in the opposite direction of the arrow, there should be no gas blowing out of the other nozzle: if there is gas blowing out, judge whether the one-way valve is always on.
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