Din 11864 1 2 3 Form A Aseptic Liner 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.

Liner Ferrule Seating Across Screwed Assemblies

Flexible fluid lines built around din 11864 1 form a utilize female liner ferrules matched to external union nuts and male threaded adapters. Metallic stops arrest axial travel upon complete engagement, isolating the elastomer from excessive mechanical load and preventing gasket extrusion into the fluid conduit.

Precision-machined hose shanks secure elastomeric or fluoropolymer tubing using external crimping collars. Smooth internal bore geometry prevents fluid stagnation behind the liner face, maintaining laminar motion across fluctuating line pressures.

Concentric Alignment Under Severe Thermal Stress

For stationary processing skids handling severe thermal cycling, din 11864 2 form a defines flanged unions with interlocking spigots and recessed elastomeric pockets. Male and female faces align along rigid centerlines, resisting piping deflection during pressurized transfer operations.

Recessed O-ring grooves protect the sealing elastomer from steam erosion during SIP cycles. Metal-to-metal boundary stops maintain continuous seal compression without requiring ongoing bolt tension adjustments.

Functional Delineation Across Hygienic Connection Types

Rapid Maintenance via Clamp Liner Configurations

Where processing stations require frequent hose changeouts, 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 O-ring against precise metallic stops.

Two-piece hinged clamps allow swift line changeovers during batch transitions. Controlled groove dimensions eliminate gasket misalignment errors common with standard flat-faced sanitary fittings.

Surface Micro-Finishes Resisting Biofilm Colonization

Internal contact diameters finished 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.

Technical Data