Electro-Pneumatic Positioner 4-20mA Input

Electro-pneumatic positioners are used with rotary air actuators to accurately position control valves used in throttling applications. These valve positioners convert a 4-20mA input control signal to a proportional pneumatic output. This output is fed to an air actuator which in turn controls the valve position and flow (combined with mechanical feedback). Air actuated valves with positioners have a history of rugged and reliable service in tough applications. Valworx positioners offer fast and 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- 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 and an easy read visual valve position indicator. Easy to adjust zero and span. Positioner is PRE-INSTALLED when ordered with a Valworx air actuated valve package.

Note: The cycle time of assemblies using a positioner could be slower than the actuator cycle time by upwards of 10 seconds.

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Input Signal4-20mA DC Impedance250 +/- 15 ohms Rotation0-90 degree (clockwise or counter-clockwise) Supply Pressure20 to 100 PSI (filtered, dry, oil free air) Flow Capacity2.8 SCFM Air Consumption0.10 SCFM Ambient Temperature-4 to 158 degree F Linearity+/- 1.5% F.S. Hysteresis+/- 1.5% F.S. Sensitivity+/- 0.4% F.S. Repeatability+/- 0.5% F.S. Air Connections1/4" NPT Gauge Connections1/8" NPT EnclosureAluminum die casting Enclosure RatingGeneral purpose, IP66 weatherproof Electrical Connection1/2" NPT female conduit Mounting BracketFits Namur 80x30 and 130x30 mounting holes with 20 or 30mm shaft height

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Lister said electrical and hydraulic options are the biggest competition to electro-pneumatic control. While there are some applications in which those technologies do fit better, there are a wide variety of others for which electro-pneumatic is the right solution.

He said in the past, electrical control was typically better for providing the precision required of positioning applications. But with Proportion-Air&#;s two-loop QB2X pressure regulator, it is possible to get as good as, if not better, control over electrical.

With the QB2X, you can integrate a position sensor with an air cylinder and plug the sensor directly into the QB2X to allow for position control without having to utilize another PLC.

&#;Using the second loop technology, you can control speed, torque, or whatever you&#;d like,&#; said Lister. &#;If there's a sensor out there for it, we can hook it up to the QB2X.&#;

Hydraulic control is typically for those applications with high force requirements, typically in the tens of thousands of psi. However, Lister said Proportion-Air does have electro-pneumatic components, including the QBX pressure regulator, which are capable of achieving higher pressures. The company&#;s GX unit directly drives up to 1,000 psi.

For higher pressures, ratio regulators are available for the QBX which increase the amount of pressure that can be controlled. &#;We&#;ve controlled up to 7,500 psi,&#; he said. &#;We know from the process and part availabilities we can go up a little over 20,000 psi but no one has really had the application for that yet.&#;

Applications with space or size constraints may also factor into the ability to use electro-pneumatic control. &#;If you don&#;t have compressed air or ways to fit hoses in, then you can use electrical for [applications] that need some precision,&#; said Lister.  &#;Sometimes it is not worth putting a whole compressor in if there is just one little part that you need the precision on.&#;

READ MORE: Advanced Electropneumatic Positioning Achieves Dynamic Force Control

Applications Benefitting from Electro-Pneumatic Pressure Regulators

Determining the applications for which electro-pneumatic pressure regulators like Proportion-Air&#;s QBX are best suited is difficult because they control process variables. &#;That&#;s such a wide variety of things,&#; said Lister. &#;It&#;s like asking what&#;s the best benefit for a screw? It really depends on what you&#;re using it for; the benefits really vary wildly.&#;

He said the pressure regulators are commonly used in automation related applications, and have proved particularly beneficial for manufacturing semiconductors, medical devices, and automotive components.

One example he provided was controlling steam temperature for tire curing. Ensuring the correct temperature is reached and maintained throughout the curing process is critical to creating a safe and high-quality tire.

Contact us to discuss your requirements of Valve Accessories. Our experienced sales team can help you identify the options that best suit your needs.