The seal of the stud coupling is specified by what is laid down in ISO standard 6149-80 andDIN standard 3852. To obtain the correct assembly on all terminal fittings it is essential toadhere to the tightening torques shown in the following table.
SIRIT POLANDCharacteristics and scope of use
Instantaneous fittings braking sistem
The SIRIT brass istantaneous push-in fitting has been designed to be used with (Rilsan) 11/12 polyamide or (Hytrel) elastomeric polyester tubings on the pneumatic circuits of auxiliary and braking systems on trucks and trailers.
It is a ready-to-use safety fitting that does not require additional tools or equipment for coupling with the tubings. The only operation required is the manual insertion of the tubing in the seat of the fitting.
This make for a much shorter assembly time than with traditional cutting ring-type coupling.
Assembly time are estimated to be 70%÷80% shorter. The tolerance of the used tubings must comply strictly with those set forth in ISO standard 7628 and DIN standard 74324/73378.
The operating heat range for the SIRIT istantaneous fitting is +100°C / -40°C. The seal in these conditions is ensured by means of a specific design mix selected for the SIRIT O-Ring.
Straight terminal assembly instructions
The tubing must be cut at right angles with a maximum tolerance of 15°. Correct assembly isperformed only when the tubing inserted touches the end of the tube seat. To be absolutelycertain that this is the case it is advisable to mark the depth of the tubing coupling (distance H).
The tubing/fitting coupling does not require tools. To make the operation easier it issufficient to slightly turn the tubing. The force required for the fitting is shown in thefollowing table.
Pivoted studs assembly operation
Unscrew the hexagonal nut of about 360°.
Screw the adapter in the female thread until the O-Ring reaches the sealing seat.
Orient the adapter in the required position (max. range 360°, keeping the sense of screwing).
Block the hexagonal nut with the torque as indicated on table.
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