✅ Reversible pneumatic actuator with rolling diaphragm (max. air supply pressure: 6 bar)
✅ Electric actuators with manual override, torque switches, and overheat protection
✅ Available in ANSI150 and ANSI300 pressure ratings
✅ Multiple plug designs, including perforated plugs for noise reduction
✅ Leakage class IV – VI compliance (ANSI / FCI 70-2)
✅ Explosion-proof electric actuator versions available (ATEX-certified)
Technical Specifications
Valve Types & Configurations
- ARI-STEVI® 470 - ANSI – Control valve with standard sealing options
- ARI-STEVI® 471 - ANSI – Control valve with stainless steel bellows for high-temperature applications
Material Options & Pressure Ratings
| Model | Nominal Pressure | Material | Nominal Diameter (DN) |
|---|---|---|---|
| 32.470....90 | ANSI150 | SA216WCB | DN25-200 / NPS 1"-8" |
| 32.471....90 | ANSI150 | SA216WCB | DN25-200 / NPS 1"-8" |
| 35.470....90 | ANSI300 | SA216WCB | DN25-200 / NPS 1"-8" |
| 35.471....90 | ANSI300 | SA216WCB | DN25-200 / NPS 1"-8" |
Other materials and special versions available upon request.
Stem Sealing Options
| Model | Standard Sealing | Optional Sealing |
|---|---|---|
| 470 (DN25-200) | PTFE V-ring (-10°C to 220°C) | Graphite (-10°C to 425°C) |
| 470 (DN25-200) | EPDM (-10°C to 150°C, suitable for water & steam up to 180°C) | -- |
| 471 (DN25-200) | Stainless steel bellows with graphite (-29°C to 425°C) | Stainless steel bellows with EPDM (-29°C to 150°C, suitable for water & steam up to 180°C) |
Pressure & Temperature Ratings
| Model | Nominal Pressure | Operating Temperature Range | Max Operating Pressure (bar) |
|---|---|---|---|
| 470 / 471 - ANSI150 | ANSI150 | -29°C to 425°C | 19.6 bar @ 38°C |
| 470 - ANSI300 | ANSI300 | -29°C to 425°C | 51.1 bar @ 38°C |
| 471 - ANSI300 | ANSI300 | -29°C to 425°C | 30 - 40 bar |
Plug Designs & Flow Performance
- Parabolic plug with metal seat (standard) – Leakage Class IV (ANSI / FCI 70-2)
- Parabolic plug with PTFE-soft seal (max 200°C) – Leakage Class VI
- V-port plug with metal seat – Leakage Class IV
- Perforated plug for noise reduction (optional) – Ideal for gases and steam applications
Actuation Options
Pneumatic Actuator – ARI-DP 32 - 35
- Max Air Supply Pressure: 6 bar
- Spring-opening or spring-closing function
- Handwheel for manual operation available (optional)
Electric Actuator – ARI-PREMIO / AUMA SAR
- ARI-PREMIO 2.2 - 25 kN / PREMIO-Plus 2G
- Digital control, IP65 protection, torque switches
- Explosion-proof version available (ATEX-certified)
- AUMA SAR 07.2 - 14.6
- IP67 protection, integrated torque & travel switches, overheat protection
- Explosion-proof version available upon request
