Cutting rings / NC compression rings, DIN 3861

 

Description

 

Zinc-plated steel type

 

 

Materials:

Bodies: Zinc plated steel, any existing elastomer seal: NBR

 

Temperature range:

-40°C to max. +120°C (with an elastomer seal: -35°C to max. +100°C)

 

Stainless steel type and NC screw connection

 

 

Materials:

Body: 1.4571, any existing elastomer seal: FKM

 

Temperature range:

-60°C up to max. +400°C (with elastomer seal: -20°C to max. +200°C, NC screw connections on request up to +550°C)

 

Montage Schneidringverschraubungen und NC-Klemmringverschraubungen

1) Cut the tube away at a right angle and lightly deburr and clean the inside and outside. Do not use a tube cutter. In the case of thin-walled or soft pipes a reinforcing ring must be used.

2) Thoroughly oil the socket threads and cone, inner union nuts and cutting ring. For stainless steel cutting ring connections PASTE ES must be used (optional for NC screw connections).

3) Push the union nut and cutting ring onto the tube. Ensure the correct position of the cutting ring/NC compression ring - otherwise the assembly will be incorrect.

4) Loosen the union nut as far as possible by hand. Attach the marking of the union nut for checking the specified rotations. Press the tube to stop in the cone - otherwise no cutting process can be carried out. Tighten the union nut by approx. 1 rotation (DIN cutting ring fittings), or. approx. 1 1/4 rotations (NC compression ring fittings) using the screw wrench. The tube must not be rotated.

5) Loosen the union nut to check the assembly. Cutting ring: The raised tube material must cover the front cutting ring area. If not, retighten slightly. Due to the spring effect of the cutting ring, this can still be rotated - no functional error. NC compression ring: The compression ring can no longer be displaced. Final assembly: Assemble the union nuts on sockets until there is a noticeable increase in force. Then tighten with 1/2 rotation (DIN cutting ring fittings), or 1/4 rotation (NC compression ring fitting).

6) Endmontage: Überwurfmutter auf Stutzen bis zum merklichen Kraftanstieg montieren. Danach mit 1/4 - 1/2 Drehung (Schneidringverschraubung), bzw. 3/4-Drehung (NC-Klemmringverschraubung) festziehen.

 

Warning:

Assembly of stainless steel screw connections only with the aid of suitable lubricant.

 

Hinweise zu NC-Klemmringverschraubungen

 

 

Advantages:

• Compatible with all cutting ring fittings according to DIN EN ISO 8434-1 (DIN 2353). • Also resistant to dynamic loads such as vibrations and pulsations. • It can be loosened and screwed back in as often as is necessary. • In contrast to a cutting ring the NC compression ring is not hardened, therefore it cannot rust and has good chemical resistance. • Lubrication of the nut thread for initial assembly is not necessary, •Vacuum tightness Q< 10^8 mbar l/>, •Ideal for use in gas and water area

 

Benötigte Rohrqualität:

The screw connections must be processed with heat treated, seamless stainless steel tubes (1.4571) according to DIN EN ISO 1127. The tolerance category should be D4/T3, the surface must not show any damage and its hardness should not be more than Rockwel HRB 90.