KRS-3 30-60mm
Weld End
Weld-neck expansion joints are expansion elements that belong to the axial compensator group and are designed to absorb thermal expansions occurring in pipelines in the axial direction. These compensators are especially preferred in high-pressure and high-temperature applications, contributing to the safe and long-lasting operation of the system.
In system engineering, pipelines are typically divided into different expansion zones, which are separated from each other by fixed points. Thanks to this structural solution, the thermal movement in each expansion zone is controlled solely by the axial expansion joint installed in that specific area.
The weld-neck design ensures a stronger and leak-proof connection between the compensator and the pipeline. This increases durability, particularly in environments with high vibration or significant temperature differences.
Technical Information
Standard Production : AISI 321 (DIN 1.4541)
Special Production : AISI 304 (DIN 1.4541), AISI 309 (DIN 1.4828), AISI 316 (DIN 1.4401), AISI 316 ti (DIN 1.4571) etc
Design Pressure : 16 BAR
Design Temperature : – 196 + 550 C
Standard Weldend : Rst 37-2 (DIN 1.0038)
Special Weldend : Stainless Steel etc.
Standard Liner : AISI 321 (DIN 1.4541)
Special Liner : AISI 304 (DIN 1.4541), AISI 309 (DIN 1.4828), AISI 316 (DIN 1.4401), AISI 316 ti (DIN 1.4571) etc
Technical Drawing

Applications
To absorb axial expansions, reduce stress and noise in the system, all machines, all motors, all pumps, industrial applications, exhaust applications, gas and water lines, drinking water lines, etc.
Paint Information
Flanges between DN 25–DN 300 are cadmium plated. For sizes DN 300 and above, specially painted flanges resistant to corrosion are used. It offers high durability and long-lasting use for industrial systems.
Special Note
If requested, the design temperature can be increased to +950°C. Contact us for special requests. Flange tables are in the technical tables section. Product weights have a tolerance of ±10%. Liner is recommended for abrasive fluids.
DN ø | L mm | ø d mm | ø Do mm | +/- AX mm | AX N/mm | KEA cm² | Flange Outer Diameter D mm | Flange Hole Center k mm | Flange Thickness b mm | Flange Hole Number n | Hole Diameter e mm | Approximate Weight Kg Kg |
25 | 120 | 36 | 45 | 10 | 86 | 12 | 115 | 85 | 16 | 4 | 14 | 2,70 |
32 | 130 | 44 | 53 | 15 | 60 | 18 | 140 | 100 | 16 | 4 | 18 | 4,10 |
40 | 130 | 50 | 62 | 15 | 60 | 24 | 150 | 110 | 16 | 4 | 18 | 4,10 |
50 | 150 | 61 | 77 | 17 | 88 | 37 | 165 | 125 | 18 | 4 | 18 | 5,10 |
65 | 160 | 77 | 97 | 19 | 89 | 58 | 185 | 145 | 18 | 4 | 18 | 7,20 |
80 | 170 | 90 | 115 | 24 | 80 | 82 | 200 | 160 | 20 | 8 | 18 | 8,00 |
100 | 175 | 117 | 146 | 24 | 89 | 134 | 220 | 180 | 20 | 8 | 18 | 10,00 |
125 | 195 | 142 | 170 | 26 | 68 | 192 | 250 | 210 | 22 | 8 | 18 | 8,00 |
150 | 220 | 169 | 199 | 26 | 130 | 265 | 285 | 240 | 22 | 8 | 22 | 17,00 |
200 | 220 | 220 | 254 | 36 | 158 | 442 | 340 | 295 | 24 | 12 | 22 | 26,00 |
250 | 235 | 275 | 315 | 27 | 230 | 683 | 405 | 355 | 26 | 12 | 26 | 37,00 |
300 | 320 | 328 | 393 | 23 | 665 | 1019 | 460 | 410 | 28 | 12 | 26 | 52,00 |
350 | 320 | 365 | 419 | 23 | 713 | 1205 | 520 | 470 | 30 | 16 | 26 | 73,00 |
400 | 330 | 410 | 476 | 20 | 812 | 1538 | 580 | 525 | 32 | 16 | 30 | 91,00 |
450 | 340 | 460 | 526 | 20 | 919 | 1897 | 640 | 585 | 32 | 20 | 30 | 117,00 |
500 | 350 | 508 | 569 | 20 | 1009 | 2273 | 715 | 650 | 34 | 20 | 33 | 142,00 |