Buried Type Expansion Joint
The buried type expansion joint is mainly used for axial compensation of buried pipelines and has the capability of bending resistance. Therefore, the impact of pipeline sinking can be ignored, and it has the characteristics of large compensation and long service life. The direct-buried expansion joint compensation shell and the guide sleeve can be free expansion compensation under protection,and the other performances are the same as those ordinary bellows expansion joint.
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Buried Type Expansion Joints | Structure Diagram |
NO | ITEMS | MATERIALS |
NO
| ITEMS | MATERIALS |
1 | Short connection tube | Carbon steel | 8 | Long connection tube | Carbon steel |
2 | Left ring plate | Carbon steel | 9 | Middle connection tube | Carbon steel |
3 | Inner sleeve | SS304/Carbon steel | 10 | Right ring plate | Carbon steel |
4 | Shell | Carbon steel | 11 | Graphite packing | Graphite |
5 | Guide plate | Carbon steel | 12 | Shield ring | Carbon steel |
6 | Outer connection tube | Carbon steel | 13 | Compaction ring | Carbon steel |
7 | Bellow | SS304/SS316L/SS321 | 14 | Fixed plate | Carbon steel |
Technique Parameter
Normal Diameter | Length | Axial Movements | Axial Stiffness | Joint Size D X S | Radial Max. Size D1 | Working Pressure |
mm | mm | mm | N/mm | mm | mm | Mpa |
100 | 600 | 60~90 | 74~112 | Ø108X4 | 270 | 0.25~2.5 |
150 | 750 | 70~110 | 82~120 | Ø159X4.5 | 370 | 0.25~2.5 |
200 | 780 | 70~130 | 85~125 | Ø219X6 | 400 | 0.25~2.5 |
250 | 780 | 70~130 | 93~132 | Ø273X8 | 470 | 0.25~2.5 |
300 | 850 | 80~130 | 95~142 | Ø325X8 | 550 | 0.25~2.5 |
350 | 780 | 80~130 | 98~151 | Ø377X8 | 650 | 0.25~2.5 |
400 | 850 | 80~130 | 104~170 | Ø426X10 | 680 | 0.25~2.5 |
500 | 900 | 80~130 | 110~180 | Ø529X10 | 750 | 0.25~2.5 |
600 | 1100 | 100~150 | 120~205 | Ø630X10 | 800 | 0.25~2.5 |
700 | 1100 | 100~150 | 125~210 | Ø720X12 | 1200 | 0.25~2.5 |
800 | 1100 | 100~150 | 130~215 | Ø820X12 | 1300 | 0.25~2.5 |
900 | 1200 | 110~160 | 135~230 | Ø920X12 | 1400 | 0.25~2.5 |
1000 | 1200 | 110~160 | 138~242 | Ø1020X12 | 1500 | 0.25~2.5 |
* They’re the regular sizes above, we can design and produce according to users’ detail required sizes and conditions.
Application of Buried Expansion Joint
Burying type expansion joint are mainly used for absorbing axial movement in burying duct line caused by thermal expansion and compression. And the burying expansion joints has good performance characters, such as soil pressure resistance, self-direction, good fatigue and maintenance free etc.
