BY Type Compression-Type Limiting Expansion Joint
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BY Type Compression-Type Limiting Expansion Joint
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Product Description
Technical Specifications for BY-Type (SSJB-3) Compression-Type Limiting Expansion Joints
Product Introduction
The BY-type (SSJB-3) gland‑type limit expansion joint has been developed on the basis of the original performance characteristics of the SSJB gland expansion joint.
Its operating principle involves welding the straight pipe sections on both sides to the product’s limiting device. The joint is then connected to the limiting device using extended bolts, and the dimensions are locked with nuts at the maximum expansion/contraction point, allowing the pipeline to freely expand and contract within the allowable range of the compression-type expansion joint. This product is suitable for connecting piping systems that feature a certain degree of slope, bends, or significant vibration. In long-distance pipelines, using this product can effectively prevent damage to the system caused by thermal expansion and contraction, among other factors.
This product does not include a limit‑stop anti‑pull‑out device. It is suitable for connecting pipelines conveying water, oil, gas, slurries, and particulate media. This product complies with the technical requirements specified in GB/T12465-2017.
Structure and Material
| Name | Quantity | Material |
|
|
| 1 | Flange gland Follower |
2 | Carbon steel (Q235A) or ductile iron (QT400-15) |
|
| 2 | Sleeve | 1 | Carbon steel (Q235A) or ductile iron (QT400-15) |
|
| 3 | Limit short pipe Limited ShortPipe |
2 | Carbon steel (Q235A) | |
| 4 | Sealing rubber Sealing | 2 | Natural Rubber (NR) Nitrile rubber (NBR) or chloroprene rubber (CR) |
|
| 5 | Nut | 8n | Carbon steel (Q235A galvanized) | |
| 6 | Long stud | n | Carbon steel (Q235A galvanized) | |
| 7 | Bolt | n | Carbon steel (Q235A galvanized) |
Note: For SSJB-3 gland‑type limit‑stroke expansion joints with a nominal diameter greater than DN300, it is recommended to use steel structural components as a whole. If there are specific material requirements (e.g., stainless steel, etc.), please specify in advance.
Technical Parameters of BY Type (SSJB–3) Gland-Type Limiting Expansion Joints
| Nominal Diameter Nominal Dia. DN |
Pipe outer diameter Pipe O.D. Dw |
Overall Dimension | Expansion amount Linear Movement △L |
n-Th. | |||
| D | L | L1 | 0.6–1.6 Mpa |
2.5 Mpa |
|||
| 65 | 76 | 155 | 645 | 180 | 90 | 2-M12 | 2-M12 |
| 80 | 89 | 165 | |||||
| 100 | 108 | 195 | 2-M16 | ||||
| 114 | 195 | ||||||
| 125 | 133 | 225 | |||||
| 140 | 225 | ||||||
| 150 | 159 | 255 | 2-M16 | 3-M16 | |||
| 168 | 255 | ||||||
| 200 | 219 | 310 | 4-M20 | ||||
| 250 | 273 | 375 | 3-M20 | 5-M20 | |||
| 300 | 325 | 440 | 655 | 220 | 110 | ||
| 350 | 377 | 490 | 4-M20 | ||||
| 400 | 426 | 540 | |||||
| 450 | 480 | 590 | 5-M20 | 6-M20 | |||
| 500 | 530 | 645 | |||||
| 600 | 630 | 750 | |||||
| 700 | 720 | 850 | 6-M20 | 7-M20 | |||
| 800 | 820 | 965 | 1075 | 290 | 150 | 6-M24 | 8-M24 |
| 900 | 920 | 1065 | 7-M24 | 9-M24 | |||
| 1000 | 1020 | 1165 | |||||
| 1200 | 1220 | 1365 | 8-M24 | 10-M24 | |||
| 1400 | 1420 | 1590 | 9-M27 | 12-M27 | |||
| 1500 | 1520 | 1690 | |||||
| 1600 | 1620 | 1795 | 10-M27 | 14-M27 | |||
| 1800 | 1820 | 2000 | 11-M27 | 15-M30 | |||
| 2000 | 2020 | 2200 | 12-M27 | 16-M30 | |||
| 2200 | 2220 | 2420 | 13-M27 | - | |||
| 2400 | 2420 | 2635 | 14-M30 | ||||
| 2600 | 2620 | 2835 | 15-M30 | ||||
| 2800 | 2820 | 3040 | 16-M33 | ||||
| 3000 | 3020 | 3240 | 17-M33 | ||||
| 3200 | 3220 | 3440 | 1130 | 400 | 260 | 18-M33 | - |
| 3400 | 3420 | 3640 | 19-M33 | ||||
| 3600 | 3620 | 3860 | 20-M33 | ||||
| 3800 | 3820 | 4080 | 20-M36 | ||||
| 4000 | 4020 | 4300 | 21-M36 | ||||
Brief Installation Instructions
1. The BY-type (SSJB-3) gland-type limit‑stroke expansion joint is suitable for connecting piping systems where both ends are straight pipelines.
2. The product is fully assembled before leaving the factory; simply weld the product to the pipeline on both sides, evenly tighten the nuts adjacent to the compression nut diagonally, and then adjust the limiting nuts accordingly.
3. During the pressure test, the pipelines on both sides of the product should be securely fixed to prevent the product from being subjected to excessive axial tensile forces that could damage the piping system.
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