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- Expansion Joint
- NK-VN7900
Expansion Joint
NK-VN7900
Single Bellow, Flanged Type with Tie Rods (Compact and Lightweight)
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APPLICATION
- Absorb thermal expansion and contraction in piping systems
- Support structural movement in buildings, bridges, and infrastructure
- Protect equipment from stress and fatigue due to temperature changes
- Restricting axial movement and restraining pressure thrust
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 1.0MPa
*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. Flange | Carbon Steel . Stainless Steel |
| 3. Holder | Carbon Steel . Stainless Steel |
| 4. Tie rods | Carbon Steel . Stainless Steel |
SPECIFICATION
Unit: mm
| Size | Inner diameter ID | Expansion Amount | Contraction Amount | Main Anchor Loading Force (N) | Min. OAL | |
| DN | Inch | |||||
| 50 | 2 | 59.1 | 10 | 20 | 6,375 | 160 |
| 65 | 2-1/2 | 74.9 | 10 | 25 | 9,103 | 160 |
| 80 | 3 | 87.3 | 10 | 25 | 13,229 | 180 |
| 100 | 4 | 111.4 | 10 | 25 | 19,150 | 190 |
| 125 | 5 | 136.9 | 10 | 25 | 25,653 | 190 |
| 150 | 6 | 161.9 | 10 | 25 | 33,693 | 200 |
| 200 | 8 | 213.1 | 10 | 25 | 56,513 | 200 |
| 250 | 10 | 264.2 | 10 | 25 | 81,500 | 200 |
| 300 | 12 | 315 | 10 | 25 | 108,395 | 200 |
Calculated at 1.0 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
• More compact and lightweight compared to NK-VN6500.
• 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.
• Available in sizes up to DN1000 upon request.
