Airline Couplings to BS AU 138a:1980
There is an Emergency Line and a Service Line between each truck and trailer. Additionally there can also be an Auxiliary Line.
---------------------------------Truck/Tractor Fittings ------------Trailer Fittings
Emergency Line---Self Sealing Valve -----Female 'C'----------------Male
Service Line -------Self Sealing valve------Male-----------------------Female 'C'-----Valve Lifter
Auxiliary Line----Self Sealing Valve ------Female 'CA'----------------Male 'CA'
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Truck/Tractor Couplings
- Tractor couplings must always have a self sealing valve fitted.
- On the Emergency Line there will be a Female Self Sealing valve and a Female C Coupling.
- On the Service Line there will be a Male Self Sealing valve and a male coupling.
- On the Auxiliary line there will be a Female Self Sealing Valve and a Female CA coupling
- All of these couplings are available in 1/2"BSP and M22 fittings.
- The Self Sealing valve can be purchased as an assembly with the coupling or each part may be purchased separately.
- Couplings should be assembled with a suitable sealant and aluminium washers should not be used.
Trailer Couplings
- The trailer does not need a self sealing valve.
- On the Emergency Line there will be a male coupling.
- On the Service Line there will be a Female C coupling and a valve lifter (to open the self sealing valve).
- On the Auxiliary Line there will be a Male CA coupling.
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