Brochure

Catalog CIC-2003-1/US
Couplings
Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
95
Couplings
Technical Information
Design and Operation
A complete 5780 Series Coupling consists of the combination of male and female coupling halves. Either coupling
half is available with or without a charging port, depending on the particular application.
Coupling Halves Before Connection
Diaphragms in the coupling halves provide a seal that
prevents refrigerant loss before connection. The male
half (right unit) contains a cutter blade, the metal
refrigerant sealing diaphragm and intermediate
synthetic rubber seal which prevent loss of refrigerant
while the coupling is being connected. The female half
(left unit) contains a metal diaphragm which is a leak-
proof metal closure.
Coupling Halves Connected
Tightening the union nut draws the coupling halves
together, piercing and folding both metal diaphragms
back and opening the fluid passage, thereby providing
minimal restriction to flow. When fully coupled, a parent
metal seal forms a permanent leakproof joint between
the two coupling halves preventing the loss of refriger-
ant to the atmosphere.
The cutaway views below show male and female
coupling halves joined at 20%, 50%, and 100%
connection. Note the way the cutter blades pierce
the diaphragms and fold them back out of the flow
path. Also note the difference in the final sealing area
before and after torquing.
20% connected
50% connected
100% connected
Final sealing area
connected prior to torquing
Final sealing area
connected after torquing
5700 Series One-Shot™ Brass Couplings