✅ Compact design with a rotatable bonnet
✅ Interchangeable seat rings for easy maintenance
✅ Various plug designs, including perforated plugs for noise reduction
✅ Multiple sealing options, including PTFE, EPDM, and stainless steel bellows
✅ Available in pressure ratings from PN16 to PN40
✅ Leakage class IV – VI compliance (DIN EN 60534-4)
✅ ATEX-compliant explosion-proof electric actuator models available
Technical Specifications
Valve Types & Configurations
- ARI-STEVI® 448 – Standard control valve with PTFE or EPDM sealing
- ARI-STEVI® 449 – Control valve with stainless steel bellows for high-temperature applications
Material Options
| Figure | Nominal Pressure | Material | Nominal Diameter (DN) |
|---|
| 12.448 | PN16 | EN-JL1040 | DN15-100 |
| 22.448 / 22.449 | PN16 | EN-JS1049 | DN15-100 |
| 23.448 / 23.449 | PN25 | EN-JS1049 | DN15-100 |
| 25.448 | PN40 | EN-JS1049 | DN15-50 |
| 32.448 / 32.449 | PN16 | 1.0619+N | DN15-100 |
| 34.448 / 34.449 | PN25 | 1.0619+N | DN15-100 |
| 35.448 / 35.449 | PN40 | 1.0619+N | DN15-100 |
| 52.448 / 52.449 | PN16 | 1.4408 | DN15-100 |
| 54.448 / 54.449 | PN25 | 1.4408 | DN15-100 |
| 55.448 / 55.449 | PN40 | 1.4408 | DN15-100 |
Other materials and custom versions available upon request.
Stem Sealing Options
| Model | Standard Sealing | Optional Sealing |
|---|
| 448 (DN15-100) | PTFE V-ring (-10°C to 220°C) | EPDM (-10°C to 150°C, allowed for water and steam up to 180°C) |
| 449 (DN15-100) | Stainless Steel Bellows with Graphite Packing (-60°C to 400°C) | Stainless Steel Bellows with PTFE V-ring (-60°C to 220°C) |
Pressure & Temperature Ratings
| Material | PN Rating | Temperature Range | Max Operating Pressure |
|---|
| EN-JL1040 | PN16 | -10°C to 120°C | 16 bar |
| EN-JS1049 | PN16 | -10°C to 200°C | 16 bar |
| EN-JS1049 | PN25 | -10°C to 200°C | 25 bar |
| EN-JS1049 | PN40 | -10°C to 200°C | 40 bar |
| 1.0619+N | PN25 | -60°C to 400°C | 25 bar |
| 1.0619+N | PN40 | -60°C to 400°C | 40 bar |
| 1.4408 | PN40 | -60°C to 450°C | 40 bar |
Plug Designs & Flow Performance
- Parabolic plug with metal seat (standard) – Leakage Class IV (DIN EN 60534-4)
- Parabolic plug with PTFE-soft seal (max 200°C) – Leakage Class VI
- Parabolic plug with armored sealing edge – Enhanced sealing with metal seat
- Perforated plug (for noise reduction, metal-seated) – Ideal for gases and steam, reducing acoustic levels
Actuation Options
Pneumatic Actuator – ARI-DP 30-34
- Max Air Supply Pressure: 6 bar
- Rolling diaphragm design for smooth operation
- Spring-opening or spring-closing function
- Handwheel for manual operation available
Electric Actuator – ARI-PREMIO-Plus 2G
- Digital actuator control with BLDC technology
- Energy-efficient and compact design
- Protection Class: IP65
- Handwheel for emergency operation
- Torque and travel switches included
