Low pressure quick release couplings – general information
Low pressure quick release couplings (maximum working pressure up to several tens of bar) are designed to connect hoses with different system elements and equipment in industrial applications handling air, gases and fluids. The quick release couplings for compressed air tend to be the most popular in an endless range of applications such as connecting systems by hoses or air compressors with pneumatic tools e.g. blow guns, pneumatic spanner etc. The quick release couplings fall into the following groups:
- free flow quick release couplings, have no valves either in the plug or the socket;
- single shut-off quick release couplings, with a valve built into the socket as a standard, this valve opens when the plug is inserted, the plug has no valve;
- double shut-off quick release couplings, both the socket and the plug contain valves, these valves open when the socket and the plug is connected;
- dry brake quick release couplings, double shut-off, flat face of both the socket and the plug ensures minimum or no spill during connection or disconnection.
The plug is locked in the socked body by a locking mechanism (usually by the balls pressed against the external plug profile). There are many plug profiles, some of them conform to international design standards, some conform to the standard of one or numerous manufacturers, more or less popular in the industry. The interchangeability of quick release couplings from different manufacturers may be considered as the ability to connect the socket with the plug of the same profile but from different manufacturer and each time requires verification. It is recommended to use both the socket and the plug of the same manufacturer.