✅ Reversible pneumatic actuator with rolling diaphragm (max. 6 bar air supply)
✅ Electric actuators available with fail-safe function
✅ Multiple plug designs for precise flow control
✅ Various stem sealing options (PTFE, EPDM, graphite, stainless steel bellows)
✅ Available in different pressure ratings (PN16 – PN40)
✅ Leakage class IV – VI compliance (DIN EN 60534-4)
✅ Explosion-proof electric actuator versions available
Technical Specifications
Valve Types & Configurations
- ARI-STEVI® 440 – Control valve with standard sealing options
- ARI-STEVI® 441 – Control valve with stainless steel bellows for high-temperature applications
Material Options
| Figure |
Nominal Pressure |
Material |
Nominal Diameter |
| 12.440 / 12.441 |
PN16 |
EN-JL1040 |
DN15-250 |
| 22.440 / 22.441 |
PN16 |
EN-JS1049 |
DN15-250 |
| 23.440 / 23.441 |
PN25 |
EN-JS1049 |
DN15-150 |
| 34.440 / 34.441 |
PN25 |
1.0619+N |
DN15-250 |
| 35.440 / 35.441 |
PN40 |
1.0619+N |
DN15-250 |
| 54.440 / 54.441 |
PN25 |
1.4408 |
DN15-250 |
| 55.440 / 55.441 |
PN40 |
1.4408 |
DN15-150 |
Other materials and custom versions available on request.
Stem Sealing Options
| Model |
Standard Sealing |
Optional Sealing |
| 440 (DN15-150) |
PTFE V-ring (-10°C to 220°C) |
Graphite (-10°C to 450°C) |
| 440 (DN200-250) |
EPDM (-10°C to 150°C) |
PTFE (-10°C to 250°C) |
| 441 (DN15-250) |
Stainless Steel Bellows (-60°C to 450°C) |
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 |
PN25 |
-10°C to 200°C |
25 bar |
| 1.0619+N |
PN40 |
-60°C to 400°C |
40 bar |
| 1.4408 |
PN40 |
-60°C to 450°C |
40 bar |
Actuation Options
Pneumatic Actuator – ARI-DP 32-34
- Max Air Supply Pressure: 6 bar
- Spring-closing or spring-opening function
- Optional top-mounted handwheel
Electric Actuator – ARI-PREMIO 2.2-25kN / AUMA SAR
- Protection Class: IP65 (Premio), IP67 (AUMA SAR)
- Torque and travel switches
- Handwheel operation for emergency cases
- Fail-safe function available
