Pressure eliminator
The application of a socket or a plug with a pressure eliminator facilities connection of quick release couplings when residual pressure in the system is high. The eliminator, a tiny release valve with two small holes, is built into the socket or plug. Once the quick release coupling is connected, release valve opens, the medium flows out through the holes causing the drop of the static pressure.
socket and plug without eliminator | valve without eliminator |
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socket and plug with eliminator | valve with eliminator |
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ISO-F quick release couplings can be fitted with a pressure eliminator at the plug side only. In ISO-F plug with the pressure eliminator, there is an additional space inside the body, into which pressurised oil enters when connecting to the socket. As a result, static pressure drops (in the hose assembly on the plug side) and the quick coupling can be easily connected.
socket without eliminator | plug without eliminator |
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plug with eliminator |
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Protection against accidental disconnection
Disconnection of standard quick release couplings requires backward pull of the plug-locking sleeve in the socket. To prevent accidental disconnection, some of the quick release couplings are equipped with locking sleeve security mechanism preventing backward pull and accidental disconnection. This feature is implemented by an additional safety locking ring (which needs to be moved in the direction of sleeve and turned) or security pin (safety lock- turning of the sleeve is only possible in a proper position of a cut in the sleeve).
safety locking ring | locking pin |
quick release coupling unlocked | quick release coupling unlocked |
quick release coupling locked | quick release coupling locked |
„Push-pull” system
The application of “push-pull” quick release couplings protects flexible hose assemblies from tearing apart in case of accidental strain (e.g. a tractor drives away from a seeder – a mechanical coupler has already been unhooked but hydraulic installation is still connected). The “push-pull” system works properly only if the socket is fixed to the body of equipment (housing) with a knurled locking sleeve (see picture below). When the hose assembly is strained, automatic disconnection of the quick release coupling follows. This prevents damage of the hydraulic installation and possible oil loss. There is also a type of quick release couplings with emergency breakaway function.
„One hand operation” – connection and disconnection with one hand
To connect standard quick release coupling, locking sleeve must be pulled back and the plug must be pushed into the socket. In order to increase the ease of handling, some of the quick release couplings are connected (disconnected) with one hand. The connection takes place automatically after only pushing the plug into the socket. In order to disconnect such a coupling, the locking sleeve must be pulled back and the plug will pop out.
One hand operation | Standard |
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