STEVI® Vario
Complete solution, endless possibilities
The STEVI Vario is a variable, compact control valve for universal applications. It is based on a modular system, which means that the configuration is adaptable to the task at hand.
Nominal diameter: | DN 15-100 / NPS ½" - 4" | |
Nominal pressure: | PN 16-40, ANSI 150 | |
Body materials: | EN-JL1040, EN-JS1049, 1.0619+N, 1.4408, SA216WCB, SA351CF8M | |
Temperature: | Series 448: -10 to max 220°C (depending on the stem seal) Series 449: -10 to 400°C (optionally -60°C) |
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Kvs values: | 0,1 - 160m3/h | |
Plug design: | Parabolic plug, perforated plug (optional) | |
Characteristic: | Equal-percentage or linear | |
Rangeability: | 50:1 (e.g. for a parabolic plug with an equal-percentage characteristic) | |
Leakage class: | IV, optionally IV-S1 or VI | |
Stem seals: | PTFE V-ring units, EPDM, stainless steel bellows | |
Actuators: | Electric or pneumatic | |
Flow media: | Cold water, hot water, saturated steam, superheated steam, gases, coolants, brine, refrigerants, heat transfer oils ... |
*Compared to STEVI® Smart and STEVI® Pro
Rotatable upper part for optimum handling. The mounted actuator can be turned 360° and individually aligned according to the installation conditions.
Rugged and durable owing to the vibration-free, shaft guided plug.
Optional: Armoured sealing edge at the plug and seat extends the service life, e.g. with contaminated media.
Screwed seat ring provides added flexibility. Up to 5 different Kvs values.
Parabolic plug – high control performance combined with excellent resistance to dirt.
Quieter operation owing to the perforated plug; the additional guide in the seat enables increased stability.
User-friendly, easy-to-maintain coupling between the final control element and the actuator. The actuator can be mounted and removed quickly and aligned according to the installation conditions.
Various stem seal systems allow maintenance-free operation. For example, the stainless steel bellows with a graphite packing as the secondary seal is ideal for heat transfer systems using organic heat transfer media as per DIN 4754-1.
Benefits
- Safe – Proven, maintenance-free stem seals, extended service life owing to the optimised valve lift
- Economical – Compact dimensions and high control performance
- Reliable – Feature options and accessories for a wide range of applications
- Durable – Optional coatings for the final control element if used in critical environments
- Independent – Electric and pneumatic actuators developed / manufactured in-house for maximum flexibility and autonomy
- User-friendly – Combination of a final control element and actuator with documentation of relevant data, e.g. closing pressure
- Modern – Digital actuators and positioners ensure easy start-up owing to quick initialisation
- Efficient – Economical BLDC motors and digital electropneumatic positioners save energy owing to the low power or air consumption
- Simple – NAMUR mounting for electropneumatic positioners – internationally recognised
- Accepted – Digital positioners made by SIEMENS: either compact and straightforward with PS100 or variable and versatile with PS2
- Versatile – Other electropneumatic positioners from several different manufacturers available on request
- Globally available – ARI is directly represented, or has partners, in many countries
ARI-PREMIO -Plus 2G Smart actuator
- 3-point and 4-20mA / 0-10V control (integrated positioner)
- Easy operation and start-up
- Speed control
- Economy function
- Diagnostic functions
- Compatible with the myPREMIO app
ARI myPREMIO – the new ARI app for controlling and evaluating the PREMIO-Plus actuator. In addition to the Bluetooth interface, the communications package which is required in order to use the app also includes the status LEDs and analogue feedback
- Actuator control
- Start-up
- Diagnostics
- Settings
- Data exchange
ARI-DP – Single-acting pneumatic actuator
- Robust design
- Various sizes; as much actuating force as necessary, as little air consumption as necessary
- Long service life
Optional: Digital positioners
e.g. Siemens Sipart PS100 or ARI STEVI-POS
Benefits:
- Rapid (one-touch) start-up
- Easy setting
- Rugged body
- Compact dimensions
- Low air consumption