The DIN 2631, 2632, and 2633 standards represent the classic German hierarchy for Weld Neck (WN) flanges. Each DIN number corresponds to a specific pressure rating: DIN 2631 (PN 6), DIN 2632 (PN 10), and DIN 2633 (PN 16). These flanges feature a tapered hub that provides structural reinforcement, making them ideal for high-stress environments. Though now largely integrated into the EN 1092-1 system, these DIN designations remain the global benchmark for legacy maintenance and specialized machinery.
Technical Attributes: DIN 2631 / 2632 / 2633
DIN 2631 Pressure,PN 6 (6 bar)
DIN 2632 Pressure,PN 10 (10 bar)
DIN 2633 Pressure,PN 16 (16 bar)
Flange Type,Weld Neck (Vorschweißflansche)
Material (Carbon),"RSt 37-2, St 52-3, C22.8"
Material (Stainless),"1.4301 (304), 1.4401 (316), 1.4571"
Size Range,DN 10 to DN 2000+
Facing Standard,DIN 2526 (Form C Raised Face most common)
Connection,Butt-weld transition to pipe
Manufacturing,Forging or Flash-butt welding
Bore Profile,Matches pipe ID to prevent turbulence
Tapered Hub,Reinforces against vibration/stress
Weld Prep,DIN 2559 (Beveled edge)
Seal Face Roughness,Rz = 40 to 160 µm (Standard)
Bolt Holes,Metric drilling patterns
Status,Superseded by EN 1092-1 Type 11
Certification,DIN 50049 (Legacy) / EN 10204 3.1
Usage,"Water, Steam, and Chemical pipelines"
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