Pressure Balance Stainless Steel Expansion Bellows
1. Self-balancing mechanism automatically cancels internal blind plate pressure forces.
2. Accommodates axial and lateral movements while neutralizing pressure thrust.
3. Extreme condition capability: up to 150 Bar pressure and 1200°C temperature.
4. Premium materials: SS304, SS316, Inconel 600, and Hastelloy X options.
5. Protects sensitive equipment like turbines, pumps, and compressors from nozzle loads.
6. Eliminates need for massive main anchors, reducing civil engineering costs.
7. Available in standard sizes DN400-DN1600, larger sizes up to DN3000 available.
8. Fully compliant with EJMA 10th edition and GB/T 12777 standards.
Pressure Balance Stainless Steel Expansion Bellows
The DEVEL® Pressure Balance Expansion Joint is a sophisticated engineering solution designed to accommodate axial and lateral movements while simultaneously neutralizing internal pressure thrust. Fully compliant with EJMA 10th edition codes, this unit utilizes a balancing bellows coaxial to the line bellows to eliminate the need for heavy-duty main anchors. It is engineered to withstand extreme conditions with working temperatures up to 1200°C and pressures up to 150 Bar, utilizing premium materials such as Inconel 600, Hastelloy X, and SS316L. This makes it indispensable for high-pressure systems and connections to sensitive equipment like turbines, pumps, and compressors.
Key Features at a Glance
- Pressure-Balanced Mechanism: Special structure automatically cancels out internal blind plate pressure forces, preventing thrust transmission to piping or machinery.
- Premium Multi-Ply Construction: Manufactured from high-grade stainless steel (SS304, SS316L) or Inconel bellows for superior corrosion and thermal resistance.
- Self-Balancing Design: Unique mechanism automatically balances the force generated by internal pressure, eliminating blind plate force transmission.
- Equipment Protection: Relieves heavy anchor load burdens on fragile connected pumps, turbines, or vessels by minimizing nozzle loads.
- Space & Cost Efficiency: Eliminates requirement for massive main anchors and heavy structural supports, significantly reducing civil engineering costs.
- Extreme Condition Capability: Engineered to withstand temperatures up to 1200°C and pressures up to 150 Bar.
- Flexible Material Solutions: Available in SS304, SS316, Inconel 600, and Hastelloy X to suit diverse industrial standards.
- EJMA Compliant Design: Fully designed and manufactured according to EJMA 10th edition codes and GB/T 12777 standards.
Key Technical Advantages
- Self-Balancing Mechanism: The unique design automatically balances the force generated by internal pressure, preventing the blind plate force from being transmitted to the piping system or connected machinery. This self-balancing feature is the core innovation that sets this expansion joint apart.
- Equipment Protection: By minimizing nozzle loads, it protects expensive and sensitive equipment such as turbines, pumps, and compressors from structural stress and misalignment, extending equipment service life and reducing maintenance costs.
- Space & Cost Efficiency: It eliminates the requirement for massive main anchors and heavy structural supports, significantly reducing civil engineering costs and saving installation space. This makes it ideal for retrofit projects and space-constrained installations.
- Flexible Material Solutions: Bellows are manufactured from premium alloys including SS304, SS316, Inconel 600, and Hastelloy X to suit diverse domestic and international industrial standards and aggressive media applications.
Product Parameters (DEVEL Standard)
| Specifications | Details |
|---|---|
| Nominal Diameter (DN) | DN400 – DN1600 (larger sizes up to DN3000 available) |
| Max Working Pressure | Up to 150 Bar |
| Max Working Temperature | Up to 1200°C |
| Bellows Material | SS304, SS316, Inconel 600, Hastelloy X |
| Design Code | EJMA 10th Edition |
| Connection Standard | ANSI, DIN, JIS, GB (Flanged or Weld-end) |
| Movement Type | Axial and Lateral |
| Structural Feature | Balancing bellows coaxial to line bellows |
Dimensional Specifications
Note: Install length based on the Devel factory standard. Other lengths can be changed according to your requirement.
| Nominal Diameter | Number of Convolutions | Install Length (mm) | Max Outer Diameter | ||
|---|---|---|---|---|---|
| mm | inch | Weld End (Range) | Flange End (Range) | ||
| 400 | 16 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 780 |
| 450 | 18 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 870 |
| 500 | 20 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 920 |
| 600 | 24 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1010 |
| 700 | 28 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1140 |
| 800 | 32 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1240 |
| 900 | 36 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1370 |
| 1000 | 40 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1500 |
| 1200 | 48 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1600 |
| 1250 | 50 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1750 |
| 1300 | 52 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1800 |
| 1350 | 54 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1850 |
| 1400 | 56 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1900 |
| 1450 | 58 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 1950 |
| 1500 | 60 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 2000 |
| 1600 | 64 | 8 (4+4) | 1200 – 2500 | 1500 – 3000 | 2100 |
Typical Applications
Power Industry
Steam turbine exhaust lines and boiler feed-water systems where pressure thrust elimination is critical for equipment protection.
Petrochemical & Refining
High-pressure process lines where anchor space is limited and equipment protection is paramount.
High-Pressure Steam Turbine
Connections to sensitive turbine inlets where nozzle load minimization prevents costly equipment damage.
Chemical Processing
Handling corrosive media under fluctuating pressure and temperature conditions with Hastelloy or Inconel construction.
Marine & Aerospace
Compact piping systems requiring high reliability, safety, and space-efficient installations without heavy anchors.
Gas Pipelines
Large-scale natural gas distribution networks where pressure thrust management is essential for pipeline integrity.
Installation & Design Standards
- Standard Compliance: Fully designed and manufactured according to EJMA 10th edition codes and GB/T 12777 standards, ensuring global acceptance and proven performance.
- Structural Integrity: Features integrated tie rods or balancing frames to ensure stable performance under maximum operating loads, with redundant safety factors.
- Customization & Supply: Available in standard sizes from DN400 to DN1600, with larger sizes up to DN3000 available on request. Flexible options for both import and domestic project models with quick delivery capabilities.
Product Tags
Self-Balancing Bellows
High Pressure 150 Bar
High Temperature 1200°C
Inconel 600
Hastelloy X
EJMA 10th Edition
Turbine Protection
DN400-DN3000
No Main Anchor
Need Pressure-Balanced Solutions for Critical Equipment?
Contact DEVEL Engineering for custom pressure-balanced expansion joint designs and equipment load analysis.
