Positioners ensure a predetermined assignment of the valve position (controlled variable) to the input signal (reference variable). They compare the control signal issued by pneumatic or electric automation equipment (controller, control station, process control system) to the position or opening angle of the control valve and supply a corresponding output signal pressure. Positioners are often used as servo-booster as they convert low-energy signals into strong proportional signal pressures up to the maximum supply pressure (6 bar/90 psi). They can be used in standard and splitrange operation.
At SAMSON, we can draw on more than 100 years of experience and expertise in control valve engineering. In 1957, we launched the first pneumatic positioner onto the German market. Since then, we have enhanced and perfected our positioners, their attachment and their interaction with a wide variety of valve models and valve accessories.
SAMSON digital positioners are single-acting or double-acting positioners for attachment to pneumatic linear or rotary actuators. Due to their digital signal processing technology, these positioners have the following advantages over conventional positioners:
TROVIS SAFE digital positioners with single-acting or double-acting function are SIL-certified devices for attachment to pneumatic control valves in safety-instrumented systems. In addition to the integrated valve diagnostics, they perform full stroke tests (FST) and partial stroke tests (PST) and contain ready-configured parameters for on/off valves and HART® communication.
Together with valve accessories, pneumatic control valves serve as engineered solutions for special applications. SAMSON has been developing and manufacturing high-quality valves, actuators and valve accessories for over 100 years. Thanks to our experience and expertise as well as customer requirements, we have continuously developed the individual components and optimized their interaction.
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