Control valve STEVI Vario - 448/449 | ARI
Control valve STEVI Vario - 448/449 | ARI
Control valve STEVI Vario - 448/449 | ARI
Control valve STEVI Vario - 448/449 | ARI

Control valve STEVI Vario - 448/449 | ARI

The ARI-STEVI® 448 / 449 series consists of high-performance straight-through control valves with a screwed seat ring, designed for precise flow control in industrial applications. Available with pneumatic (ARI-DP) or electric (ARI-PREMIO-Plus 2G) actuators, these valves ensure reliable, maintenance-free operation and optimal energy efficiency.

Standard (Options)
  • DIN
Connection (Options)
  • Flanged
Material (Options)
  • EN-JL 1040 (GG25) Cast iron
  • EN-JS 1049
  • 1.0619+N
  • 1.4408
Pressure Rating (Options)
  • PN 16
Flow (Options)
  • Straight Way
Actuator (Options)
  • Pneumatic
  • Electric

Datasheet and documents

Description

✅ 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

  1. ARI-STEVI® 448 – Standard control valve with PTFE or EPDM sealing
  2. 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

Tests and Certification

DGRL 2014/68/EU (PED Pressure Equipment Directive)
GOST-R (Russia)
CRN (Canada)

Accessories & Compatibility