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- Expansion Joint
- NK-VN7700EXD
Expansion Joint
NK-VN7700EXD
Double Bellow, Flanged Type (Compliant with JIS B 2352:2013)
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APPLICATION
- Compensating for large thermal expansion and contraction
- Support structural movement in buildings, bridges, and infrastructure
- Protect equipment from stress and fatigue due to temperature changes
FEATURES
- Applicable Media: Water, Air, High-pressure Steam, Oil, Hot Oil, Gas, Exhaust Gas...etc
*For others, please contact us for consultation - Woking Pressure: Up to 2.0MPa
*Higher Pressure is available on request - Working Temperature: Up to 650 Deg. C.
*Disregard working pressure
**Higher Temperature is available on request - End Connection: JIS, DIN, EN, BS, ASME
*Special standard is available on request
STRUCTURE
Materials
| 1. Bellows | Stainless Steel (304 . 321 . 316L . Other) |
| 2. End pipe | Carbon Steel . Stainless Steel |
| 3. Fixed flange | Carbon Steel . Stainless Steel |
| 4. Neck ring 1 | Carbon Steel . Stainless Steel |
| 5. Outer pipe | Carbon Steel . Stainless Steel |
| 6. Stub bolts | Carbon Steel . Stainless Steel |
| 7. Anchor base | Carbon Steel . Stainless Steel |
| 8. Middle pipe | Carbon Steel . Stainless Steel |
| 9. Neck ring 2 | Carbon Steel . Stainless Steel |
| 10. Middle ring | Carbon Steel . Stainless Steel |
| 11. Rib | Carbon Steel . Stainless Steel |
SPECIFICATION
Unit: mm
| Size | Inner diameter ID | Expansion Amount | Contraction Amount | Main Anchor Loading Force (N) | Min. OAL | |
| DN | Inch | |||||
| 20 | 3/4 | 27 | 20 | 50 | 2,339 | 680 |
| 25 | 1 | 33.5 | 20 | 50 | 3,166 | 680 |
| 32 | 1-1/4 | 40.9 | 20 | 50 | 5,420 | 680 |
| 40 | 1-1/2 | 46.3 | 20 | 50 | 7,170 | 680 |
| 50 | 2 | 59.1 | 20 | 50 | 9,964 | 680 |
| 65 | 2-1/2 | 74.9 | 20 | 50 | 14,830 | 780 |
| 80 | 3 | 87.3 | 20 | 50 | 21,019 | 780 |
| 100 | 4 | 111.4 | 20 | 50 | 31,341 | 880 |
| 125 | 5 | 136.9 | 20 | 50 | 43,321 | 880 |
| 150 | 6 | 161.9 | 20 | 50 | 58,017 | 930 |
| 200 | 8 | 213.1 | 20 | 50 | 98,125 | 930 |
| 250 | 10 | 264.2 | 20 | 50 | 144,035 | 980 |
| 300 | 12 | 315 | 20 | 50 | 194,532 | 980 |
Calculated at 2.0 MPa and 200 °C
INSTALLATION GUIDE
• Read the manual for proper setup and long-term reliability.
• Install strong fixed points to resist spring force and pressure thrust.
• Place fixed points close to the expansion joint.
• Use only one joint between two fixed points.
NOTES
• Best option for Steam and large thermal expansion and contraction.
• The information in this catalog may be subject to updates or modifications without prior notice.
• Special lengths are available on request.
• Special contraction and expansion amounts are available on request.
• The higher sizes are available upon request.
