A valve positioner cannot be selected by brand name or input signal alone. It also has to match the actuator type, action, travel, air supply, control system and site certification requirements. If one of these details is overlooked, installation may become difficult—or the positioner may not operate the valve as expected. This guide explains what to check before ordering a pneumatic or smart valve positioner. It also compares three widely used product families from Fisher, Siemens and ABB and shows what information is useful when replacing an existing unit....
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