DIN Bite Type Tube Fitting

DIN bite type tube fitting / Cutting ring pipe fittings

• Owing to its ideal shape, the fitting ensures safe and tight tube connection.

• During assembly of the fitting, the two cutting edges of the cutting ring penetrate into the tube creating a safe connection. At the same time, the cone of the nut deforms the cutting ring shoulder so that the tube is tightly clamped and able to absorb bending stresses.

• Radial and axial sealing is assumed by the ring's being wedge between tube and fitting body.

• A progressively increasing tightening torque guarantees high safety of assembly.

• Cutting ring pipe fittings can be disassembled and reassembled as often as necessary.

  
  

Connecting Non-welding

The cutting ring helps fast assembly of removable tubes, avoids welding, tapping and flaring, thus assuring maximum simplicity of complex oleo-dynamic systems.

Optimized cutting area,center area ,shoulder area

-----optimized cutting edge angle

----- wedge-shaped cutting flank

-----chip upsetting groove,in order to achieve stable cutting area

-----cone stop limit for assembly preventing excessive tightening

-----large contact surface between nut and ring

During assembly of the cutting ring ,the two edges of the cutting ring penetrate into the tube creating a safe connection.At the same time,the cone of the nut deforms the cutting ring shoulder so that the tube is tightly clamped and able to adsorb bending stresses.Radial and axial sealing is assumed by the ring’s being weage between tube and fitting body.

Cutting ring fittings comply with DIN2353/ DIN EN ISO 8434-1.These fittings are available in the following ranges:L(light) and S(heavy).Cutting ring fittings are available in carbon steel and stainless steel.

Nominal Pressure of Cutting Ring Coupling (acc.to DIN2353)

Reduction in pressure

Material 1.4571 allows a reduction in pressure as a function of temperature.(DIN17440,DIN17458)

Installation

Step 1

Tube selection

A tube grade suitable for cold-bending and flaring is to be used. We recommend the use of

seamless precision steel, material St 37.4/St 52.4/AISI 316L. Tolerances of tube outside and

inside deameters to DIN 2391C (EN 10305). Calculated pressure accordiing to DIN 2413.

Step 2

Saw pipe off at right angle

Saw off min. 10 mm from the parting cut made by the tube manufacturer (delivery-related Saw the tube

off at right angles, an angular deviation of 1/2° relative to the tube axis is permissible. Do not use pipe

cutters or cutting-off wheels as they cause source of faults). severe burring and inclined cuts. Use a sawing machine or saawing device.

Step 3

Debur the tube end and clean the tube

Debur inside and out (max 0.2X45°）and clean.The assembly area at the tube end(at the least twice the nut length),must be free from shavings,dirt and paint.

Step 4

Fix the fitting with a vice

Fix the pre installation stud with a vice

Step 5

Lubricate nut,ring and thread with grease

Lubricate the threads of pre-installation stud , nut and ring as shown.

Step 6

Pre-assembly

Place nut and cutting ring or T-ring as shown.

Step 7

Check

Check penetration of cutting edge. A ring of material must be visible in front of the cutting ring's cutting edge.Cutting ring may turn on tube but must not be capable of axial displacement.

Step 7

Final assembly

Tighten nut until a noticable increase in force is required.For final assembly,tighten the nut

further approx. 1/4 to 1/2 turn.

Use a second spanner to fix fitting body from moving.

On larger sizes, a spanner with sufficient lever length should be used.

Use pre-assembly machine to achieve accompishment of controlled final assembly.

NOTICE

For tube bends, the length of the straight tube end up to the start of the bending radius must be at least twice the nut length.

The minimum length of a straight pipe should be at least three times the nut length.

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