Stainless Steel Expansion Bellows (Normal Type)
1. Multi-ply austenitic stainless steel construction (SS304, SS316L, SS321, Inconel 625).
2. Standard axial thermal expansion management for metallic piping networks.
3. Operating temperature range from cryogenic -196°C to high-temp 700°C.
4. Optional internal flow sleeve to minimize friction and erosion.
5. Dual connection versatility: weld-end or flanged configurations.
6. Wide size range DN15-DN4000 (1/2″ – 160″) for diverse applications.
7. Robust fatigue life: 1000-5000 cycles under extreme thermal cycling.
8. Compliant with GB, ANSI, DIN, JIS, EN 1092-1 global standards.
Stainless Steel Expansion Bellows (Normal Type)
DEVEL Stainless Steel Expansion Bellows (Normal Type) are high-performance thermal expansion joints precisely engineered to absorb axial compression, elongation, and lateral deflection in metallic piping networks. Fabricated from multi-layer austenitic stainless steel grades, these corrugated bellows eliminate structural stresses caused by thermal variations and mechanical vibration. Available in both butt-weld ends and flanged configurations, they suit diverse industrial ducting and high-temperature fluid piping systems with a bore range from DN15 to DN4000.
Key Features at a Glance
- Multi-Ply Austenitic Stainless Steel Construction
Formed from high-ductility stainless steel sheets with single or multi-ply layers (SS304, SS316L, SS321, Inconel 625) for enhanced pressure resistance and targeted flexibility. The multi-ply architecture distributes stress across layers, significantly improving fatigue life and leak-before-break safety margins compared to single-ply designs. - Standard Axial Thermal Management for Metallic Piping Networks
The simplest and most reliable choice for managing linear axial thermal growth in piping systems. Absorbs thermal expansion and contraction through elastic bellows convolution deformation, maintaining system integrity across a broad temperature range from cryogenic -196°C to high-temperature 700°C environments. - Optional Internal Flow Sleeve for Erosion Protection
An integrated internal liner minimizes fluid friction and turbulence-induced erosion, protecting the bellows convolutions from direct flow impingement. This significantly extends service life in high-velocity applications and prevents debris accumulation between convolutions that could compromise flexibility. - Dual Connection Options — Weld-End and Flanged
Seamlessly accommodates either smooth butt-weld end configurations for monolithic pipeline integration or rigid flanged boundaries for modular systems. This dual versatility simplifies installation in both new construction and retrofit projects without requiring transition fittings. - Global Standard Compliance for Worldwide Compatibility
Manufactured to GB, ANSI, DIN, JIS, and EN 1092-1 connection standards, ensuring direct compatibility with international piping systems. Material certifications and full traceability documentation are provided with each batch, supporting compliance requirements in regulated industries.
Key Features & Advantages
- Optimized Multi-Convolution Geometry: Engineered with dedicated convolution structures to provide targeted flexibility and precise spring rate characteristics under load, ensuring predictable performance across the full operating range.
- Dual Connection Versatility: Seamlessly accommodates either smooth weld-end configurations for monolithic lines or rigid flanged boundaries for modular pipeline sections, simplifying installation in both new and retrofit projects.
- Robust Fatigue Life: High-tenacity metal forming matrices exhibit superior resistance to structural stress crystallization and pressure cyclic fatigue under extreme thermal shifts, with fatigue life ranging from 1,000 to 5,000 cycles depending on configuration.
General Parameters & Specifications
| Parameter | Specification |
|---|---|
| Nominal Diameter | DN15 – DN4000 (1/2″ – 160″) |
| Pressure Rating | PN0.25 – PN4.0 | Class 150 – 300 |
| Operating Temperature | -196°C – 700°C |
| Movement Capacity | 30mm – 500mm |
| Bellows Material | SS304, SS316L, SS321, Inconel 625 |
| Connection Material | Carbon Steel (Q235/A105) or Stainless Steel |
| Connection Standard | GB, ANSI, DIN, JIS, EN 1092-1 |
| Fatigue Life | ≥ 1,000 – 5,000 cycles |
Dimensional Specifications & Displacement Matrix
| Nominal Diameter | Convolutions (N) | Install Length (mm) | Max OD (mm) | Axial (mm) | Lateral (mm) | ||
|---|---|---|---|---|---|---|---|
| mm (DN) | inch | Waves | Weld End | Flange End | Max OD | Axial | Lateral |
| 300 | 12 | 4 | 426 | 450 | 495 | 16 | 2.1 |
| 300 | 12 | 8 | 570 | 594 | 495 | 32 | 8.4 |
| 350 | 14 | 4 | 426 | 450 | 577 | 16 | 1.9 |
| 350 | 14 | 8 | 570 | 594 | 577 | 32 | 7.7 |
| 400 | 16 | 4 | 426 | 450 | 626 | 16 | 1.7 |
| 400 | 16 | 8 | 570 | 594 | 626 | 32 | 6.7 |
| 450 | 18 | 4 | 426 | 450 | 678 | 16 | 1.5 |
| 450 | 18 | 8 | 570 | 594 | 678 | 32 | 6 |
| 500 | 20 | 4 | 426 | 450 | 729 | 16 | 1.4 |
| 500 | 20 | 8 | 570 | 594 | 729 | 32 | 5.4 |
| 600 | 24 | 4 | 576 | 600 | 830 | 27 | 3.3 |
| 600 | 24 | 8 | 816 | 840 | 830 | 54 | 13 |
| 700 | 28 | 4 | 576 | 600 | 980 | 31 | 3.2 |
| 700 | 28 | 6 | 696 | 720 | 980 | 46 | 7.1 |
| 800 | 32 | 4 | 576 | 600 | 1080 | 30 | 2.8 |
| 800 | 32 | 6 | 696 | 720 | 1080 | 46 | 6.2 |
| 900 | 36 | 4 | 676 | 700 | 1180 | 30 | 2.5 |
| 900 | 36 | 6 | 796 | 820 | 1180 | 45 | 5.5 |
| 1000 | 40 | 4 | 676 | 700 | 1280 | 32 | 2.4 |
| 1000 | 40 | 6 | 796 | 820 | 1280 | 48 | 5.3 |
| 1100 | 44 | 4 | 676 | 700 | 1380 | 32 | 2.1 |
| 1100 | 44 | 6 | 796 | 820 | 1380 | 47 | 4.8 |
| 1200 | 48 | 4 | 676 | 700 | 1480 | 32 | 2 |
| 1200 | 48 | 6 | 796 | 820 | 1480 | 47 | 4.4 |
Engineering Note: Installation lengths listed above are based on Devel factory standard configurations. Custom lengths, convolution counts, and displacement ranges can be modified according to your specific engineering requirements. All bellows are designed and manufactured in compliance with EJMA, GB/T 12777, and ASME VIII-1 standards.
Typical Applications
- District Heating Networks: Thermal expansion management in centralized heating distribution pipelines and boiler room connections with single-plane axial compensation.
- Power Generation Plants: High-temperature steam lines and turbine exhaust systems requiring reliable thermal stress relief across large temperature differentials.
- Chemical Processing: Corrosion-resistant expansion joints for aggressive media handling and high-temperature process lines with optional Inconel 625 construction.
- Petrochemical Refineries: Critical thermal expansion management in refining units, cracking furnaces, and catalyst regeneration systems with full material traceability.
- Steel Mill Operations: Extreme temperature cycling in blast furnace gas lines, cooling water systems, and rolling mill exhausts where fatigue resistance is paramount.
- Shipbuilding & Marine: Engine exhaust systems, fuel lines, and ballast piping aboard commercial vessels and offshore platforms with DNV/BV classification available.
Product Tags
Stainless Steel Expansion Joint
Metal Bellows
Thermal Expansion Compensator
High Temperature
SS304/SS316L
Inconel Bellows
Welded End
Flanged Connection
DN15-DN4000
Power Plant
Petrochemical
Shipbuilding
Fatigue Resistant
EJMA Standard
Multi-Ply Bellows
Metal Bellows
Thermal Expansion Compensator
High Temperature
SS304/SS316L
Inconel Bellows
Welded End
Flanged Connection
DN15-DN4000
Power Plant
Petrochemical
Shipbuilding
Fatigue Resistant
EJMA Standard
Multi-Ply Bellows
Need a custom specification or have questions? Contact Henan Devel Fluid Equipment Co., Ltd. for factory-direct pricing, material selection advice, and application-specific sizing guidance.
