| 摘要 |
Two embodiments (FIGS. 1+ & FIGS. 5+) of a double, by-pass valve system for a closed refrigerant system allowing its safe servicing, the first being included in the original manufacturing of the compressor unit in the refrigerant exit line of the compressor (FIG. 4 ) and the second installed as a retro-fit on the compressor unit and provided "in-line" in the liquid refrigerant line. In the first a double valve body with a transverse bore through a main shut-off valve allows the flow of refrigerant to pass or be shut down to the rest of the system, while a secondary, access port with a transverse bore intersects the main flow valve on the upstream side of the seats by means of a manifold bore, providing a by-pass passageway to an access connection (minus a depressible valve core or "Schrader" valve) for a refrigerant hose to connect to the manifold charging gauges, allowing communication with the closed refrigerant system. Additionally, liquid refrigerant is by-passed into the evaporator coil for storage while repairing the condenser, and also individual sides of the system may be pulled on a vacuum independently to test for leaks. The second embodiment uses two, structurally independent, spaced valves connected by a "tee" to the refrigerant liquid line, forming a by-pass between the two valves. Also taught are methods for entering a closed system for testing, charging and exiting it, vacuum processing to vacuum the entire system and either the high or low sides of it simultaneously, and for the storage and transfer of the system refrigerant.
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