Cutting Ring Fitting

Requirements

Minimum tube length for short tube segments:

  • Note minimum lengths specified in table below.

Minimum distance to bends:

  • Note minimum lengths specified in table below.

Cutting the tube:

  • Cut in 90 ° angle.
  • Angle tolerance of 0.5 ° is tolerable!

Cutting the tube:

  • Use saw.
  • Grinders or Tube Cutters are not permitted!

Translation for table:

Baureihe = Series
AD = Outer diameter of tube

General Preparation

  • Deburr tube inside and outside.

Note: Do not slant the tube wall! Slightly rounded corner up to 0.2 mm x 45 ° is tolerable.

  • Tubes with thin walls and soft tubes require reinforcement sleeve.

Further information is provided in table Assembly with supporting Sleeves

  • Slide nut and cutting ring onto tube.

  • Apply lubricant on threading of swivel nut and cutting ring.

Installation with preassembly machine

  • Insert assembly cone and plate into the preparation machine.
  • Apply lubrication to the preassembly cone before every preassembly.

Caution: periodically (after approx. every 50 usages) check assembly cone for wear and tear!

Caution: Read documentation of the preassembly machine before usage!

  • Adjust pressure according to the tube diameter.
  • Insert prepared tube into the machine.

  • Firmly insert pipe.
  • Press "START" button.
  • Firmly insert pipe until machine is finished with the preassembly.

  • After preassembly with preassembly machine: check tube end for correct ridge on the tube.

Please Note: The cutting ring can be turned but it cannot slide up and down the tube when it is correctly installed!

Preparation with tempered preassembly cone

  • Fasten assembly cone in vice
  • Apply lubrication on cone and cone threading before every preassembly.

Notice: periodically (after approx. every 50 usages) check assembly cone for wear and tear!

  • Insert tube with cutting ring and swivel nut into the preassembly cone.
    Caution: push tube into the fitting all the way, otherwise the tube connection might leak!
  • Tighten swivel nut by hand.
  • For control of the according rotations of the nut: mark nut.

  • Tighten swivel nut with spanner approx. 1 1/4 rotations.
  • Caution: The tube itself may not be turned!
  • Loosen swivel nut.

  • After preassembly with preassembly cone: check tube end for correct ridge on the tube.

Please Note: The cutting ring can be turned but it cannot slide up and down the tube when it is correctly installed!

Direct installation in fitting

  • Apply lubrication on the fitting (threading and cone).

  • Insert tube with cutting ring and swivel nut into the fitting.
  • Caution: push tube into the fitting all the way, otherwise the tube connection might leak!
  • Tighten swivel nut by hand.
  • For control of the according rotations of the nut: mark nut.

  • Tighten swivel nut with spanner approx. 1 1/2 rotations. Hold fitting with spanner.
    Caution: The tube itself may not be turned!
  • Loosen swivel nut.

After preassembly with preassembly machine: check tube end for correct ridge on the tube.
Please Note: The cutting ring can be turned but it cannot slide up and down the tube when it is correctly installed!

Caution:

  • Pre-assembly of steel tubes directly in the fitting is only reccomended for exceptions.
  • Pre-assembly of stainless steel tubes directly in the fitting is not permitted.

Installation in final location

  • Always apply lubrication on nut and cutting ring with stainless steel fittings and steel fittings starting with 20 mm tube diameter.
  • Insert preassembled tube with cutting ring and swivel nut into the fitting.

  • Hold fitting with spanner.
  • Tighten swivel nut with spanner approx. 1/4 to 1/3 rotations beyond sharp increase of force.

  • The installation of the fitting with welding nipple is completed.

Repeated Installation

  • The swivel nut is tightened without increased force when the installation is repeated.
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