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

Change in Management of the AUMA Group

30.08.2022 -

Effective 1 July 2022, Mirko Pannwitz has been appointed new Managing Director for Sales and Service at electric actuator manufacturer AUMA Riester GmbH & Co. KG. He succeeds Ferdinand Dirnhofer as Chief Sales Officer (CSO). After more than 30 years of successful work for the AUMA Group, Mr Dirnhofer has decided to leave the management at his own request.

Read more

196 AUMA PROFOX actuators for Dubai cooling plant

06.05.2022 -

AUMA has delivered 196 of its PROFOX electric actuators to a district cooling plant in Dubai. Emirates Central Cooling Systems Corporation (EMPOWER), the leading district cooling provider in the United Arab Emirates, used the PROFOX units to replace under-performing pneumatic actuators at its plant in Palm Jumeirah, a group of artificial islands in Dubai.

Read more