General Information Tubing Selection Stud Forms Tightening Torques Installation Index

Bite-Lok Tube Fittings As per DIN 2353

SEALEXCEL® Bite-Lok®  Flareless  Bite Type Tube Fittings are designed according to DIN 2353 and manufactured under  rigid  quality  control  procedure  approved  to  ISO  9001:2015  and  tested  according  to extensive testing procedure BS4368 part IV which ensures leak free connection of tubes and components in fluid systems.

SEALEXCEL manufacture the Bite-Lok  Tube Fittings in accordance with the following standard
Bite-Lok  TUBE FITTINGS       :  DIN 2353
TUBE CONNECTION SIDE      :  DIN 3861 and ISO 8434

MALE STUD AND PORT TAPPING FOR

METRIC AND BSP THREADS DIN 3852 part 1 and 2
NPT THREAD ANSI / ASME B1.20.1
UN/UNF THREAD SAE J514
METRIC THREAD WITH O-RING SEAL ISO 6149 and DIN 3852 part 3
SWIVEL NUTS AND WELD FITTINGS DIN 3865
TECHNICAL TERMS FOR TUBE FITTINGS DIN 3859

MATERIAL

SEALEXCEL Bite-Lok® Tube Fittings are available as standard in material stainless steel.

HEAT TRACEABILITY

SEALEXCEL Bite-Lok® stainless steel Tube Fittings are heat code traceable back to the original mill heat from which it was made.

PRESSURE RATING

SEALEXCEL Bite-Lok® Tube Fittings are suitable for use at the following nominal pressure

Series Tube OD Nominal Pressure
L (Light) 6-15mm 250 bar
18-22mm 160 bar
28-42mm 100 bar
S (Heavy) 6-14mm 630 bar
16-25mm 400 bar
30-38mm 250 bar
Notes : Since many factor influence the pressure at which a system will or will not perform satisfactorily.
Detail as shown above are only for guidance and not rigid.

TEMPERATURE RATING

STAINLESS STEEL : up to 400ºC
CAUTION : For higher temperatures, reduction in pressures should be taken in to account


FOR SEAL MATERIAL

BUNA-N : -35ºC to 100ºC
FPM (VITON)® : -25ºC to 200ºC

FUNCTION OF BITE RING FITTINGS

General Information

Before Assembly

General Information

After Assembly

E : After assembly, a visible collar fills space in front of first biting edge.

DESIGN

SEALEXCEL has designed the Bite Ring very carefully with proper consideration having twin Biting edges to have firm and safe gripping on tubing to provide leak free connection of tube and components in fluid systems.

The important function of the Bite Ring is to have controlled progressive bite of the ring into the tube due to a unique internal geometry of the Bite Ring.

FUNCTION

As the Bite-Lok® Tube Fittings Nut tightened, the Bite Ring moves towards the surface of the tube and the front Biting edge 'A' of the Bite Ring starts Biting tube, at the point where second Biting edge 'B' of the Bite Ring comes in contact with the surface of the tube a sharp increase in torque will occur, as soon as the both Biting edges have Bite the tube to the designed depth, the third stop edge 'C' of the Bite Ring comes in contact with the surface of the tube, a considerable increase in tightening torque which is already perceptible, at the same time, the Bite Ring is gripped firmly on tube providing perfect sealing.

Due to the design of twin biting and stop edges of the Bite Ring, the arising force are properly distributed. This distribution with inner edge 'D' of the Bite Ring increase the safety with regard to flexure stresses. Thus the vibration is eliminated form the biting area.

This ensures
  • High degree of sealing efficiency
  • Reliable for high pressure applications
  • Vibration resistance
  • High Fatigue strength
  • Operational safety.