✅ Reversible pneumatic actuator with rolling diaphragm (max. air supply pressure: 6 bar)
✅ Electric actuators with manual override and overheat protection
✅ Interchangeable seat rings for easy maintenance
✅ Multiple plug designs for precise flow control
✅ Various sealing options, including PTFE, EPDM, and stainless steel bellows
✅ Available in nominal pressure ratings PN16, PN25, and PN40
✅ Leakage class IV – VI compliance (DIN EN 60534-4)
✅ Explosion-proof electric actuator versions available (ATEX-certified)
Technical Specifications
Valve Types & Configurations
- ARI-STEVI® 423 – Three-way control valve (mixing / diverting) with standard sealing options
- ARI-STEVI® 463 – Three-way control valve with stainless steel bellows for high-temperature applications
Material Options
| Model |
Nominal Pressure |
Material |
Nominal Diameter (DN) |
| 12.423 / 12.463 |
PN16 |
EN-JL1040 |
DN200-250 |
| 22.423 / 22.463 |
PN16 |
EN-JS1049 |
DN200-250 |
| 22.423 |
PN16 |
EN-JS1049 |
DN300 |
| 34.423 / 34.463 |
PN25 |
1.0619+N |
DN200-250 |
| 35.423 / 35.463 |
PN40 |
1.0619+N |
DN200-250 |
Other materials and custom versions available upon request.
Stem Sealing Options
| Model |
Standard Sealing |
Optional Sealing |
| 423 (DN200-300) |
PTFE packing (-10°C to 250°C) |
Pure graphite packing (-10°C to 450°C) |
| 423 (DN200-300) |
EPDM sealing (-10°C to 150°C, suitable for water & steam up to 180°C) |
-- |
| 463 (DN200-250) |
Stainless steel bellows with graphite packing (-60°C to 450°C) |
Stainless steel bellows with EPDM sealing (-60°C to 150°C, suitable for water & steam up to 180°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 |
| 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
- Mixing plug (with two screwed seat rings) – Standard for mixing applications (2 inlets, 1 outlet)
- Diverting plug (with two screwed seat rings) – Used exclusively for diverting service (1 inlet, 2 outlets)
- Parabolic plug with metal seat – Leakage Class IV (DIN EN 60534-4)
- V-port plug with metal seat – Leakage Class IV (DIN EN 60534-4)
Actuation Options
Pneumatic Actuator – ARI-DP 34 / 34T
- Max Air Supply Pressure: 6 bar
- Spring-opening or spring-closing function
- Handwheel for manual operation available (optional)
Electric Actuator – ARI-PREMIO / PREMIO-Plus 2G
- Digital actuator control with BLDC technology
- Protection Class: IP65
- Handwheel for emergency operation
- Integrated torque and travel switches
- Explosion-proof models available (ATEX-certified)
Electric Actuator – AUMA SAR (MATIC)
- Protection Class: IP67
- 2 torque and 2 travel switches
- Overheating protection for motor as standard
- Explosion-proof version available upon request
