Product category:
Pneumatic equipment
News Release from: Samson Controls | Subject: Positioner package
Edited by the Manufacturingtalk Editorial
Team on 02 October 2007
Positioner package for fast response
times
A new positioner package which facilitates exact positioning with fast response times has been introduced by valve specialist Samson Controls.
Valve specialist Samson Controls has 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 For example, in most process control applications, larger valves are fitted with pneumatic actuators and these provide significant positioning forces
This article was originally published on Manufacturingtalk on 16 Apr 2007 at 8.00am (UK)
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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.
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