Vacuum leak test method for small cold storage equipment

Vacuum leak test method for small cold storage equipment Refrigeration systems with evaporating pressure gauges close to or below atmospheric pressure must be tested for vacuum leak tests, leaving the refrigeration equipment under proper vacuum for a certain period of time, reflecting and observing whether air has penetrated into the system from the reading of the vacuum pressure gauge for inspection The sealing performance of the cold storage equipment system. Small cold storage equipment can use an external mechanical vacuum pump for vacuum leak test. The method steps are as follows: (1) Unscrew the fine-threaded screw plug of the suction cut-off valve counterclockwise, and turn the suction cut-off valve stem clockwise several times to make the suction cut-off valve in a three-way state; (2) Connect the vacuum pump to the multi-purpose interface on the suction cut-off valve with a soft tube with a three-way repair valve and vacuum pressure gauge; (3) Open all valves in the system (including solenoid valves and manual valves, etc.) (4) Turn on the power of the vacuum pump and pump down the system until the reading of the vacuum pressure gauge reaches -0.1MPa. After an appropriate time, rotate the suction cut-off valve stem counterclockwise to exit and tighten; (5) Maintain 18~24h. If the vacuum is unchanged, the refrigeration system vacuum test is considered qualified.