ARI-STEVI Smart 425/426
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Control valve - straight through With pneumatic and electric actuators ARI-STEVI® 425 / 426 Pneumatic actuator ARI-DP34-35 Reversible pneumatic actuator Actuator with rolling diaphragm Air supply pressure max. 6 bar Stem protection by bellow M aintenance-free O-ring sealing Assembly of additional devices acc. to DIN IEC 60534‑6 Fig. 425 Page 4 ARI-STEVI® 425 / 426 Electric actuator AUMA SAR 07.6-16.2 Enclosure IP 67 2 torque switches 2 travel switches Handwheel Overheating protection for motor as standard • Additional devices available, e.g. potentiometer • Explosion proof version available • Encased linear thrust unit Page 10 Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com!

Technical data Nominal pressure Nominal diameter Information / restriction of technical rules need to be observed! A production permission acc. to TRB 801 No. 45 is available. The engineer, designing a system or a plant, is responsible for the selection of the correct valve. Resistance and fitness must be verified, contact manufacturer for information (refer to Product overview and Resistance list). Other materials and versions on request. Stem sealing Fig. 425 I. EPDM-sealing -10°C to 150°C (allowed for water and steam up to 180°C) III. Stainless steel-bellow with pure graphite -60°C to...

Plug design Plug design standard V-port plug metal seat Plug design optional Plug shaft / Seat ring - Leakage class IV acc. to DIN EN 60534-4 - Flow characteristic: - equal percentage (glp) (modified) - linear (lin) V-port plug with PTFE-soft seal (max. 200°C) - Leakage class VI acc. to DIN EN 60534-4 - Flow characteristic: - equal percentage (glp) (modified) - linear (lin) Plug shaft V-port plug with pressure balanced plug metal seat Piston seal: PTFE with stainless steel spring (max. 200°C) - Leakage class IV acc. to DIN EN 60534-4 - Flow characteristic: - equal percentage (glp)...

Pneumatic actuator ARI-DP Control valve in straightway form with pneumatic actuator ARI-DP Further dimensions refer to page 12. Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com!

Pneumatic actuator ARI-DP Actuator data Effective diaphragm area Further technical data of the actuator: refer to data sheet ARI-DP. Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com!

Closing pressures: Pneumatic actuator ARI-DP34 max. permissible closing pressures on flow-to-open P2 = 0. Observe pressure-temperature-limits, refer to page 2. DN 300 Kvs-value max. diff. pressure 1) Perforated plug V-port plug Travel Air supply pressure min. (bar) (stem retracting by spring) DP34 800 cm2 Spring opens on air failure Perforated plug (stem extending by spring) Seat-Ø DP34 800 cm2 Spring closes on air failure I. Fig. 425: EPDM-sealing II. Fig. 425: PTFE- / pure graphite-packing III. Fig. 426: Bellows seal 1) max. 2) Air differential pressure drop supply pressure max. to...

Closing pressures: Pneumatic actuator ARI-DP34T max. permissible closing pressures on flow-to-open P2 = 0. Observe pressure-temperature-limits, refer to page 2. DN 300 Kvs-value max. diff. pressure 1) Perforated plug V-port plug (stem retracting by spring) DP34T 1600 cm2 Spring opens on air failure Perforated plug (stem extending by spring) DP34T 1600 cm2 Spring closes on air failure I. Fig. 425: EPDM-sealing II. Fig. 425: PTFE- / pure graphite-packing III. Fig. 426: Bellows seal 1) max. 2) Air differential pressure drop supply pressure max. to actuator: Edition 08/13 - Data subject to...

Closing pressures: Pneumatic actuator ARI-DP34Tri max. permissible closing pressures on flow-to-open P2 = 0. Observe pressure-temperature-limits, refer to page 2. DN 300 Kvs-value max. diff. pressure 1) Perforated plug V-port plug (stem extending by spring) Seat-Ø DP34Tri 2400 cm2 Spring closes on air failure I. Fig. 425: EPDM-sealing II. Fig. 425: PTFE- / pure graphite-packing III. Fig. 426: Bellows seal 1) max. 2) Air differential pressure drop supply pressure max. to actuator: Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com!

Closing pressures: Pneumatic actuator ARI-DP35 max. permissible closing pressures on flow-to-open P2 = 0. Observe pressure-temperature-limits, refer to page 2. DN 300 Kvs-value max. diff. pressure 1) Perforated plug V-port plug V-port plug Perforated plug (stem retracting by spring) DP35 2800 cm2 Spring opens on air failure (stem extending by spring) DP35 2800 cm2 Spring closes on air failure I. Fig. 425: EPDM-sealing II. Fig. 425: PTFE- / pure graphite-packing III. Fig. 426: Bellows seal 1) max. 2) Air differential pressure drop supply pressure max. to actuator: Edition 08/13 - Data...

Electric actuator AUMA SAR (MATIC) Control valve in straightway form with electric actuator AUMA Fig. 426 Actuator data SAR 07.6 SAR 10.2 A (mm) 265 283 B (mm) 249 254 H1 (AUMA MATIC) (mm) 130 Motor voltage: 400V 50Hz 3~ (Other voltages on request) Technical data for actuator refer to price list. For version with AUMA SAR Ex other heights. Further dimensions refer to page 12. 10 Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com!

Electric actuator AUMA SAR (MATIC) max. permissible closing pressures on flow-to-open P2 = 0. Observe pressure-temperature-limits, refer to page 2. DN V-port plug Perforated plug Kvs-value max. diff. pressure Travel Differential pressure SAR 07.6 with LE 25.1 Closing pressure I./II./III. Output drive Closing pressure I./II./III. SAR 14.2 with LE 70.1 Differential pressure Output drive Closing pressure I./II./III. SAR 14.6 with LE 100.1 Differential pressure Output drive (mm) Closing pressure I./II./III. Differential pressure Output drive Closing pressure I./II./III. SAR 16.2 with LE 200.1...

Dimensions: Standard design Control valve in straightway form Face-to-face dimension FTF series 1 according to DIN EN 558 L 250 Edition 08/13 - Data subject to alteration - Regularly updated data on www.ari-armaturen.com