| 摘要 |
<p>Two alternative embodiments (Figs. 1 and Figs. 5) of a double, by-pass valve system for a closed refrigerant type 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. The first includes a block having two valves (1, 2) and a port (5) with an internal, transverse passageway (3). The second uses two, structurally independent, spaced valves (26 and 27) 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 vaccum the entire system and either the high or low sides of it simultaneously, and for the storage and transfer of the system refrigerant.</p> |
