Pneuparts.com is a website that specializes in selling pneumatic components, such as fittings, hoses, cylinders and valves. One of the product categories found on the website is quick connectors.

Quick Release Couplings

Quick release couplings for compressed air are connections to make the installation of a compressed air system quick and easy. They connect different components of the system, such as hoses, filters, regulators and pressure transmitters, reducing installation time and cost. Quick release couplings are also convenient because they make replacing individual components easier, which contributes to system efficiency and availability. 

A quick release coupling consists of a plug-in (male part) and a quick coupler (female part). The coupling connects to the plug-in on one side, while the other side has, for example, a thread or a connection for a hose. This thread can be an internal thread (female) or an external thread (male). The hose connection can be a threaded-, compression- or pillar- connection. 

Several types of compressed air couplings are available, depending on the specific needs of the system and the requirements of the application. It is important to choose the right quick release coupling for a particular compressed air system because its performance and reliability depend on it. The choice of quick release couplings should be based on factors such as the working pressure, the type of compressed air and the components used. 

Pneuparts.com stocks many different types of quick release couplings. To know which coupling you need, it is important to know what the differences are. Here we have described some of them.

 

Passage (DN) or nominal width (NW)

The passage or nominal width of a quick release coupling is an important characteristic that determines the amount of compressed air that can flow through the system. The passage is expressed in cubic centimeters per minute (cc/min) or in liters per minute (l/min). The nominal width (NW) of a compressed air quick disconnect indicates the size of the coupling. The nominal width is the distance between the inside of the outer connecting flanges and is expressed in millimeters (mm).
A larger passage or nominal width means more air can flow through the quick coupling, resulting in higher system efficiency. A smaller passage means lower efficiency.

It is important to choose the correct passage of a quick coupling for a specific compressed air system. A quick disconnect with too little passage will impede the system and it will operate less efficiently, while a coupling with too much passage will overload the system.

The requirements of the specific application must also be considered when choosing the right quick release coupling. Some applications, such as pneumatic tools, have higher passage requirements, while others, such as pneumatic actuators, have lower passage requirements.

Nominal width (NW)	Passage (l/min)
5.5 mm	550 l/min
7.2 mm	1850 l/min
*6 bar input pressure, 0.5 bar pressure differential

 

EURO or ORION
The most common types of quick release couplings in Europe are EURO and ORION couplings. Orion NW 5.5 and the Euro NW 7.2 are the most common standards for quick release couplings. The Euro NW 7.2 couplings have a larger passage.

 

Safety couplings

Compressed air is air under high pressure and can cause serious injuries to users and people around them if used incorrectly. When disconnecting pipes or hoses, there should preferably no longer be any pressure on the compressed air system. If there is pressure on the line, be sure to hold both sides of the hose securely during disconnection. A disconnected hose can continue to whip around until the pressure is completely lost. This can damage machinery and injure employees.

Safety couplings are slightly more expensive but they protect against loosening during disconnection. These couplings are larger, heavier and can make a significant contribution to overall workplace safety.

Safety couplings have a mechanism to vent before disconnecting. This can be by means of a push button or slide mechanism. With a pushbutton, the first push causes venting. The second push will disconnect both parts.

 

	Check out the profile of most common quick release couplings here

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