A positioner for a control valve is used to adjust a valve’s position based on a desired set point for a process variable, whether it be pressure, temperature, or flow .A Pneumatic Valve Positioner receives a pneumatic signal (typically 3-15 or 6-30 psi) from a controller. It then supplies the valve actuator with the correct air pressure to provide an accurate valve stem or shaft posi... https://najemalshahab.com/product-category/valve-positioner/