Flow
System flow rate is one of the most significant factors to inspect. System designers should aim to minimize pressure drop to avoid system inefficiency when considering coupling size and internal valving for the quick connect fitting
.

Pressure
Pressure has an impact on all the components of quick coupling, hence improper pressure application can lead to disastrous results.

Air inclusion and spillage
Air inclusion is the small amount of air infiltration into a system when a coupling is connected. This only applies to couplings that close at the interface, before the valves are open.
Spillage should not be confused with leakage as it refers to small amount of fluid that is lost with the disconnection of a coupling is disconnected.

Environment
Couplings are affected by environmental factors as well as the conditions in which they are used. Outdoor couplings should be weather resistant. If a coupling will be subject to an unclean environment, it is best to select one with no moving parts as they are not affected by dirt, as much as couplers with movable sleeves. Moreover, use dust plugs in disconnect condition to avoid contamination of dust.

Location
The location of coupling is another factor that determines its selection. For example, a zero pressure type is suitable for a coupling situated on a pipe. This is because only one hand is required to operate it. Most styles would work for a coupling located at the end of a loose hose.

Frequency of use
Depending on how frequently you will use the quick-connect coupling, select one for yourself. Heavy-duty use, for example, requires couplings without spring-loaded, poppet-type valves and with O-ring seals instead of flat washers.

Sizing
A quick connect coupling is sized according to its connection size (determined by the hose or pipe fitting to which the coupling is connected) and body size (determined by the required airflow).The flow rate is not critical when a coupling is used with a dusting device.

Selecting a quick connect coupling could not have been easier! Just follow the above-mentioned tips and you will end up with the highest quality coupling that will last for years. For more, log on to sealexcel.com – you one-stop resource for everything related to pipes, fittings and valves.