Din 11864 1 2a 3 Form A Aseptic Union Hose Coupling

A din11864 union standardizes hygienic stainless steel pipe joints engineered to eliminate fluid entrapment pockets and bacterial harborage in sterile process pipelines. The specification defines tight axial tolerances that guarantee smooth inner bore alignment and regulated elastomeric compression, ensuring aseptic fluid purity across demanding processing regimes.

Hose Shank Retention Across Screwed Union Assemblies

Flexible fluid transfer lines configured under din 11864 1 integrate threaded ferrules and slotted union nuts with integrated hose shanks. Precision metallic stops arrest axial travel upon complete engagement, preventing elastomer intrusion into the fluid conduit and preserving laminar fluid motion.

Machined radial serrations along the hose shank secure elastomeric or fluoropolymer tubing against hose pull-off during pressure surges. Defined volume pockets prevent localized gasket over-compression when operators tighten retaining collars with hook spanners.

Flange Alignment Under Thermal Shock Conditions

For rigid piping runs facing high operational pressures, din 11864 2a specifies flanged assemblies featuring interlocking spigot profiles and recessed elastomeric grooves. Precision machining maintains concentric line alignment, dampening vibration from high-velocity centrifugal transfer pumps.

Recessed O-ring cavities protect elastomers against direct steam erosion during high-temperature SIP cycles. Metal-to-metal contact faces maintain seal compression without requiring ongoing bolt tension adjustments.

Functional Behavior Across Hygienic Connection Types

Rapid Line Turnaround via Clamp Assemblies

Where processing operations demand swift line reconfiguration, din 11864 3 form a establishes clamp unions with male and female liners housed inside two-piece clamps. Circumferential force draws mating flanges together, seating the elastomeric ring against metallic boundary stops.

Hinged clamp collars enable rapid decoupling during routine line sanitation routines. Controlled groove dimensions eliminate gasket misalignment errors common with standard flat-faced sanitary fittings.

Micro-Finish Requirements Eliminating Microbial Colonization

Internal contact surfaces polished below Ra 0.8 micrometers eliminate microscopic crevices where organic deposits adhere. Uniform bore transitions preserve laminar flow, allowing cleaning solutions to achieve complete fluid displacement during clean-in-place cycles.

Regulated thermal expansion prevents micro-vacuum formation during rapid cooling intervals, preserving sterile fluid containment against ambient ingress.

Product Description