Positioner Provides Fast & Precise Control of Large Valves


Valve specialists Samson Controls have introduced a new positioner package which facilitates exact positioning with fast response times over the entire operating range, including large control valves which can be problematic.

Positioner Provides Fast & Precise Control of Large Valves

Samson Controls

For example, in most process control applications, larger valves are fitted with pneumatic actuators and these provide significant positioning forces. In these situations the positioner is used to precisely position the valve by filling the actuator with the corresponding amount of air, or by venting air from the actuator.

The air output capacity required to achieve fast positioning in larger actuators (with diaphragm areas of 1400 cm2 up to 2800 cm2) is simply too much for normal positioners and so positioning accuracy can be compromised. In these situations the positioner controls a volume booster which achieves a much higher air output capacity than the positioner. Consequently this results in an overshoot on responding to small signal changes.

The new Samson positioner package, which consists of a positioner and a special hook-up of several volume boosters with different air output capacities, accomplishes this task. Closing and opening times of less than two seconds can be achieved over the entire positioning range. This package has already been used successfully for compressor bypass valves (anti-surge valves) as well as in petrochemical applications involving adsorption processes in moving-bed adsorbers.

More articles on this topic

Valentina Cristea: Winner of Axlab 2020

23.04.2021 -

Axlab is a 48-hour innovation competition for all employees ­within the Axel Johnson Group. This year’s Axlab was tougher than ever, with 781 ideas submitted. Valentina Cristea’s winning entry – a QR code for AxFlow’s industrial pumping equipment – stood out from the rest.

Read more

More Important Than Ever: ‘Bathroom Hygiene’ at ISH digital 2021

22.02.2021 -

Bathroom hygiene is a sensitive subject at any time but especially so during a pandemic. With the spread of the corona virus throughout the world, the focus has shifted so much towards bathroom cleanliness that the hygienic qualities of sanitation products are now a topic of great importance not only for consumers wanting to modernise their homes but also for architects and project planners working on public buildings.

Read more
Directly to the product selection in