How to Choose a Control Valve?
When choosing a control valve for a process, there are many things that must be considered, including the valve’s flow characteristic, its size, noise, the potential for cavitation or flashing...
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Self-Actuated Valves, Pneumatic & Hydraulic Actuators
Pneumatic actuators as illustrated in Figure, provide for automatic or semiautomatic valve operation. These actuators translate an air signal into valve stem motion by air pressure acting on a diaphragm...
Working Principle of Pneumatic Actuators
Pneumatic actuators use instrument air pressure to apply force on the diaphragm to move the valve actuator and then to position valve stem. The following photograph shows a cut-away control...
Spring and Diaphragm Pneumatic Actuators
Spring and diaphragm pneumatic actuators can be “direct-acting”, meaning that air to the diaphragm casing pushes the actuator stem downward. This “air-to-close” action compresses the spring, which in turn pushes...
How to Select an Actuator for Valve
As the process industry continues to achieve more efficient and productive plant design, plant engineers and technicians are faced, almost daily, with new equipment designs and applications. One product, a...
Basics of Actuators
A valve actuator is a device that produces force to open or close the valve utilizing a power source. This source of power can be manual (hand, gear, chain-wheel, lever,...
Types of Pneumatic Actuators Animation
A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion. The motion can be rotary or linear, depending on the type of actuator....