1.2.14Progressive ring fittings on hydraulic lines

–Then tighten by a further 1/2 rotation.

Repeat assembly:

–After each time the ferrule union is loosened, the union nut must be retightened without increased force.

Non-tight ferrule connection:

–For a non-tight connection, the union nut must initially be released until some oil escapes. –Then tighten according to instructions.

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1.2.14 Progressive ring fittings on hydraulic lines

For all pre-assemblies and profile ring screw unions supplied pre-assembled from the factory, final assembly is carried out in the associated, well oiled screw unions with a 1/2 rotation of the union nut beyond the point where an increase in force is clearly perceptible.

Pre-assembly:

–Saw the pipe off at right angles.

Do not use a pipe cutter! This cuts the wall of the pipe at an angle, which leads to the formation of burrs inside and out. –Gently deburr the end of the pipe inside and out.

Do not chamfer! –Clean the end of the pipe. For elbows, the straight end of the pipe to the start of the bend radius must be at least twice the height of the union nut. –Push the union nut and profile ring onto the pipe. –Push the pipe against the stop position in the union and tighten the union nut, until the profile ring touches the pipe.

The pipe must not turn simultaneously.

This point can be perceived by the increasing rise in force. –Tighten the union nut by 1/2 a rotation beyond the pressure point. –Checking the incision at the cutting edge:

A visibly raised collar must fill the space in front of the profile ring face side. The profile ring must turn, but not be moved axially.

Final assembly:

–Insert the pre-assembled pipe in the well oiled union. –Tighten the union nut until there is a perceptible increase in force and then by a further 1/2 rotation.

Important: Hold the screw unions with a wrench!