DIN 14 Long Weld-End Union Liner

DIN 14 Long Weld-Neck Geometry

The DIN 14 welded liner is the unthreaded female-side collar of a DIN 11851 union assembly, combining an extended cylindrical butt-weld neck with an outer retaining shoulder and front sealing face. Its longer neck distinguishes it from the compact DIN 14S short liner and the internally grooved DIN 14R expanding liner.

Materials and Bore Surface Finish

Manufactured in SS304 (AISI 304) or SS316L (AISI 316L) stainless steel, the liner is specified with a surface finish of Ra < 0.8 μm. When welded to matching metric or DIN stainless tubing, the smooth through bore maintains a continuous flow path across the detachable joint.

Dimensional Reference and Companion Parts

The series specification embeds a three-part DIN 11851 reference sheet showing the DIN 13R round nut, DIN 14 welding liner, and DIN 15 welding male end. Only the DIN 14 welding liner section applies to this item; the nut, male end, and sealing ring are ordered as separate components.

Application and Sizing Notes

Used in dairy, food, brewery, beverage, pharmaceutical, and cosmetic piping from DN15 to DN150, demountable DIN unions allow easy line opening for seal inspection and maintenance. Always match dimensions A through F of the DIN 14 table to the target tube diameter and mating DIN 13R nut.