Valve Positioner

A valve positioner is a device used in industrial processes to accurately control the position of a valve. It is typically used in conjunction with control valves, which are used to regulate the flow of fluids or gases in a system.

The main purpose of a valve positioner is to ensure that the valve is in the correct position based on the input signal it receives. This is important for maintaining precise control over the flow rate or pressure in a system.

Valve positioners work by receiving a control signal from a controller or a process control system. This signal is typically in the form of an electrical current or pressure. The positioner then compares the actual position of the valve to the desired position indicated by the control signal. If there is a difference, the positioner adjusts the valve actuator to move the valve to the correct position.

There are different types of valve positioners available, including pneumatic, electro-pneumatic, and digital positioners. Pneumatic positioners use compressed air to control the valve position, while electro-pneumatic positioners combine electrical and pneumatic signals. Digital positioners, on the other hand, use electronic signals for precise control.

Valve positioners are commonly used in industries such as oil and gas, chemical processing, power generation, and water treatment. They help improve the accuracy and reliability of valve control, leading to better process efficiency and safety.