The Mark 15 positioner uses the full force of its air supply to drive and maintain a pneumatic actuator to position a valve to what is required by control instrument, regardless of the presence of forces that change valve position. This line of compact instruments incorporates a singleaxis, force-balance principle of operation to ensure accurate and stable control valve positioning. In all cases, including bottom-loading applications, a MK15 is mounted directly on the topworks of the valve, with no external levers or other exposed mechanisms. Each positioner receives a signal from a control instrument, and using an air supply as high as 50 psig (3.4 bar), the positioner strokes the valve actuator to the required position.
The Mark 16 valve positioner is used to enhance the performance of pneumatic control valves. In conjunction with pneumatic or electronic controllers, positioners eliminate positioning errors, shorten positioning times, and determine the direction of movement for proper positioning of the valve control element.
Mark 16 Side Mounted Pneumatic Positioner - Converts a low input signal from a pneumatic controller into a high output pneumatic signal for improved positioning. Mark 16-I/P Side Mounted Electro-Pneumatic Positioner - Converts an analog input signal from an electronic controller into a pneumatic output signal for positioning the control valve.
