Digital smart positioners are used with rotary air actuators to accurately position control valves used in throttling applications. Valworx positioners offer fast and highly accurate control of ball valves, butterfly valves and other type valves. These positioners direct mount to rotary type air actuators with the standard VDI / VDE-3845 Namur style top shaft mounting. Universal Namur mounting bracket kit is included with each positioner. Suitable for use with Valworx double acting or spring return air actuated valves, as well as most other brands utilizing the standard Namur mount.
Rugged aluminum die cast housing has superior anti-corrosion surface treatment. Multi-function digital display shows valve position, target position and other selectable parameters. Easy auto-calibration sets zero and span automatically. Automatically senses actuator open-to-close rotation (clockwise or counter-clockwise). Positioner is PRE-INSTALLED and calibrated when ordered with a Valworx air actuated valve assembly. HART protocol compatible.
The included dome indicator and Open/Close limit switches eliminate the need for a separate limit switch.
Input Signal | 4-20mA DC |
Impedance | 340 +/- 15 ohms |
Rotation | 0-90 degree (clockwise or counter-clockwise) |
Supply Pressure | 20 to 100 psi (filtered, dry, oil free air) |
Flow Capacity | 8.8 SCFM @ 20 psi |
Air Consumption | 0.9 SCFM @ 20 psi |
Ambient Temperature | -22 to 176 °F |
Operating Temperature | -4 to 176 °F |
Linearity | +/- 0.5% F.S. |
Hysteresis | +/- 0.3% F.S. |
Sensitivity | +/- 0.3% F.S. |
Repeatability | +/- 0.2% F.S. |
Air Connections | 1/4" NPT |
Gauge Connections | 1/8" NPT |
Enclosure | Aluminum die casting |
Enclosure Rating | General purpose, IP66 weatherproof |
Electrical Connection | 1/2" NPT female conduit |
Mounting Bracket | Fits Namur 80x30 and 130x30 mounting holes with 20 or 30mm shaft height |
Valve Visual Position Confirmation | Dome Indicator |
Valve Position Confirmation | 4- 20mA output monitoring signal (same type as input signal) |
Valve Open/Close Confirmation | 2 SPDT dry contacts |
We provide 3D CAD models in Solidworks or STEP file formats for most of our Valworx products.
Please email
sales@valworx.com to request the specific files you need. Include the stock number of the valve and any accessories with your request.