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

drawing of Female Self Sealing Valve, Female C Coupling and Male Coupling

Emergency Line---Self Sealing Valve -----Female 'C'----------------Male

drawing of Male Self Sealing Valve, Male Coupling, Female Coupling and Valve Lifter.

Service Line -------Self Sealing valve------Male-----------------------Female 'C'-----Valve Lifter

drawing of Female Self Sealing Valve, CA Female Coupling, CA Male Coupling.

Auxiliary Line----Self Sealing Valve ------Female 'CA'----------------Male 'CA'

spacing line

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.

spacing line

Illston and Robson Ltd