Coupling Description

Coupling Assembly Details

The following pages show the stages of coupling assembly as the swivel nut and male fitting are drawn together.

The swivel nut end contains one diaphragm in the center post. The male fitting contains the knife blades and its own diaphragm.

Note: 3/8 male ends have one knife blade.

No sealing takes place until the final stage, when the outer edge of the center post in the swivel nut is forced against the bottom of the male fitting, creating a mechanical seal.

•Page 4 shows what appears to be a completed assembly with only two threads showing, but the diaphragms have just begun to be pierced. Stopping here causes severe operational issues as well as refrigerant leaks.

•Page 5 shows an even more complete assembly, with only one thread showing. However, this assembly is still not complete. If not tightened further there will be refrigeration restrictions and leaks.

•Page 6 shows the two parts almost together; the threads are flush. At this point the main problem will be refrigerant leaks.

•Page 7 shows the couplings properly assembled with the critical last 1/4 turn.

•Page 8 shows details of the brass-to-brass sealing action, not visible when the couplings are assembled.

Note that couplings that are screwed together but have threads showing are not only leaking refrigerant, they are restricting the flow of refrigerant through the small slits in the membranes or diaphragms.

Page 3

none specifications

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