Din11864 1 Form A 2

A din11864 stainless steel liner functions as a precision-machined mating component in hygienic fluid systems, forming a flush, dead-space-free seal when compressed against a matching male part and elastomer ring. Designed for pharmaceutical, biotechnology, and food processing lines, this sanitary fitting prevents fluid entrapment and microbial contamination during continuous fluid transfer.

Aseptic Sealing Mechanics and Surface Integrity

Achieving sterility across processing lines requires couplings that eliminate internal crevices where bacteria form. In a din 11864 1 connection, tightening the union nut compresses an O-ring into a defined metallic recess between the liner and male part. This controlled compression creates a metal-to-metal stop that prevents over-tightening while maintaining a smooth pipe bore. Precision machining ensures internal surface finishes meet Ra ≤ 0.8 µm standards, ensuring full exposure during CIP and SIP maintenance cycles.

Structural Design Variants Across Process Pipelines

Different operational pressure demands and line layouts require specific union configurations to maintain system tightness:

• Threaded pipe couplings utilizing a din 11864 1 form a profile rely on an O-ring joint geometry that delivers reproducible seal seating under high vibration.

• Heavy-duty process manifolds prefer a din 11864 2 flange arrangement to handle larger nominal pipe diameters, higher static pressures, and severe bending moments.

Installation Best Practices and Sizing Criteria

Optimal sealing performance requires verifying axial alignment of adjoining pipe runs prior to tightening to prevent uneven elastomer squeeze. Maintenance teams must inspect O-ring grooves for residual particulate matter before final joint seating. Using automated orbital welding equipment ensures smooth internal tube joints that align perfectly with the liner inner diameter. Connecting high-purity fluid transfer lines also requires matching exact tube outer diameter and wall thickness dimensions to guarantee uninterrupted flow dynamics.

Frequently Asked Questions

What is the main advantage of DIN 11864 fittings compared to standard DIN 11851 unions?

Standard unions retain small internal gaps, whereas DIN 11864 couplings feature a metallic stop and precise seal recess that creates a flush, crevice-free internal bore.

Which elastomeric seal materials are approved for high-purity aseptic liners?

Fluoroelastomer, EPDM, Silicone, and PTFE compounds meeting FDA 21 CFR and USP Class VI criteria are standard choices for sterile line sealing.

Can orbital welding be performed directly on stainless steel aseptic liners?

Yes, the weld ends are manufactured with standardized wall thicknesses and low ferrite content to support automated orbital welding.

Technical Data

Product Parameter