Kinetrol’s AP pneumatic positioner combines the smoothness and accuracy of Kinetrol’s proven mechanical positioner technology with new advances in convenience and simplicity of use, derived from the unique innovative design both of the internal mechanism and of the overall package.
The AP positioner is designed to drive a rotary or linear actuator to a position set by a 3-15 psi (0.2-1.0 bar) signal and hold it there until the signal changes.
When a signal pressure is applied to the diaphragm it moves the force balance lever clockwise against the tension of the feedback spring. This moves the spool valve, supplying air pressure to one side of the actuator while exhausting trapped air from the other side. The feedback shaft follows the movement of the actuator and turns the cam counter clockwise, pushing the cam follower and increasing the tension on the feedback spring until it balances the force on the diaphragm and moves the spool valve to its central ‘hold’ position.
The relationship between the input signal and desired position is determined by the cam profile. A linear 3-15 psi (0.2 – 1.0 bar) signal / 0-90° output movement cam is standard.
