Stainless Steel Expansion Bellows (Hinged Type)
1. Single-plane hinged expansion bellows for controlled angular deflection.
2. Robust hinge mechanism constrains pressure thrust, reducing anchor loads.
3. Premium SS304, SS316L, or SS321 stainless steel for corrosion resistance.
4. Operating temperature range from cryogenic -196°C to high-temp +800°C.
5. Pressure ratings from PN1.0 to PN6.4 MPa for diverse applications.
6. Angular movement capacity ±5° to ±15°, customizable per requirements.
7. Rigid frame prevents torsional deformation, extending service life.
8. Compliant with EJMA, GB/T 12777, and ASME VIII-1 design standards.
Stainless Steel Expansion Bellows (Hinged Type)
Our DEVEL® Stainless Steel Hinged Expansion Bellows are engineered to absorb angular rotation in a single plane while effectively restraining pressure thrust. Featuring a robust hinge mechanism and high-grade stainless steel core, these expansion joints offer exceptional piping stability, vibration reduction, and thermal expansion relief. The Hinged Type Stainless Steel Expansion Joint (also known as a Single-plane Hinged Bellows) is an essential pressure-balanced component in piping systems, primarily consisting of bellows, hinge plates, pins, and end pipes or flanges. This product achieves angular displacement absorption in a single plane through the rotation of the hinge pins, significantly reducing the load requirements for main anchors at the pipe ends.
Key Features at a Glance
- Premium Stainless Steel Materials: High-grade SS304, SS316L, or SS321 bellows for superior corrosion resistance and thermal stability from -196°C to +800°C.
- Robust Hinge Structure: Constrains pressure thrust forces effectively, preventing pipe elongation and reducing anchor load requirements significantly.
- Single-Plane Angular Movement: Pure angular deflection in one controlled plane through precision hinge pin rotation.
- Pressure Thrust Restraint: The robust hinge assembly withstands the full force of internal pressure, eliminating the need for heavy-duty main anchors.
- Torsional Protection: The rigid frame structure prevents bellows from dangerous torsional deformation, significantly extending service life.
- Structural Stability: Precision pins ensure the bellows only experiences pure angular deflection, providing superior reliability.
- Wide Pressure Range: Available in PN1.0 through PN6.4 MPa pressure ratings to suit diverse industrial applications.
- Global Design Standards: Manufactured in compliance with EJMA, GB/T 12777, and ASME VIII-1 standards.
Key Technical Advantages
- Pressure Thrust Restraint: The robust hinge assembly withstands the full force of internal pressure, eliminating the need for heavy-duty main anchors and substantially lowering civil engineering costs. The rigid metal frame possesses high mechanical strength, capable of fully restraining the internal pressure thrust (blind plate force).
- Torsional Protection: The rigid frame structure prevents bellows from dangerous torsional deformation, significantly extending service life. This feature is critical for maintaining system integrity in high-pressure and high-temperature applications.
- Structural Stability: Precision pins ensure the bellows only experiences pure angular deflection in the intended plane, providing superior reliability and predictable performance. Unlike standard bellows, the robust metal frame simplifies piping design.
Product Parameters
| Key Specifications | Details |
|---|---|
| Nominal Diameter | DN50 – DN3000 (2″ – 120″) |
| Pressure Rating | PN1.0 / 1.6 / 2.5 / 4.0 / 6.4 MPa |
| Movement Capacity | ±5° to ±15° Angular (Customizable) |
| Design Standards | EJMA, GB/T 12777, ASME VIII-1 |
| Connection Types | Flanged or Butt-welded |
| Bellows Material | SS304, SS316L, SS321 |
| Temperature Range | -196°C to +800°C |
| Hinge Configuration | Hinge plates with precision pins |
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 | Max Outer Diameter | ||
|---|---|---|---|---|---|
| mm | inch | Weld End | Flange End | ||
| 200 | 8 | 4 | 650 | 670 | 560 |
| 250 | 10 | 4 | 650 | 674 | 620 |
| 300 | 12 | 4 | 750 | 774 | 710 |
| 350 | 14 | 4 | 750 | 774 | 760 |
| 400 | 16 | 4 | 750 | 774 | 810 |
| 450 | 18 | 4 | 850 | 874 | 860 |
| 500 | 20 | 4 | 850 | 874 | 930 |
| 600 | 24 | 4 | 1000 | 1024 | 1090 |
| 700 | 28 | 4 | 1100 | 1124 | 1190 |
| 800 | 32 | 4 | 1100 | 1124 | 1290 |
| 900 | 36 | 4 | 1200 | 1224 | 1410 |
| 1000 | 40 | 4 | 1200 | 1224 | 1550 |
| 1100 | 44 | 4 | 1300 | 1424 | 1690 |
| 1200 | 48 | 4 | 1400 | 1424 | 1790 |
Typical Applications
Petrochemical Industry
Refinery pipelines and connections between towers and piping requiring pressure thrust restraint and angular movement absorption.
Power Generation
Boiler piping and gas turbine exhaust systems where thermal expansion and pressure thrust management are critical.
High-Pressure Piping
Systems operating at elevated pressures where main anchor loads must be minimized for cost-effective installation.
District Heating
Long-distance thermal networks to manage displacement at pipe junctions with single-plane angular compensation.
Exhaust Systems
High-temperature exhaust ducts requiring thermal expansion relief and vibration reduction in industrial settings.
Industrial Plants
Demanding industrial piping applications where structural stability and pressure thrust restraint are essential.
Installation Guidelines
- Alignment: Ensure the hinge rotation plane is aligned with the pipeline’s intended displacement direction for proper angular movement absorption.
- No Disassembly: Pins are factory-set; do not disassemble hinges during installation to maintain pressure integrity and warranty coverage.
- Anchor Design: While main anchor loads are significantly reduced, intermediate anchors must still be designed to accommodate the hinge reaction forces.
Product Tags
Single Plane Angular
Pressure Thrust Restraint
SS304/SS316L
High Pressure
DN50-DN3000
Petrochemical
Power Plant
EJMA Standard
Torsional Protection
Need Hinged Expansion Joints for Your Project?
Contact DEVEL Engineering for custom angular movement calculations, hinge configurations, and anchor load analysis.
