A type of valve design that has low pressure drop is desired and a ball valve or gate valve may be selected. In other cases, it is desirable to precisely maintain a flowrate into a process and a globe valve may be the preferred solution.
The main parts of the most usual type of valve are the body and the bonnet. These two parts form the casing that holds the fluid going through the valve.Valve positions are operating conditions determined by the position of the disc or rotor in the valve
Valves regulate fluid flow regulating a pressure drop in a flow line. Valves are a common final control element for a process control system to maintain pressure, temperature, composition, or other process quantities.
Many valves have been designed with significant safety margins that have allowed successful system performance even though flow rates were not accurately measured and set.
Actuators can be found in all kinds of process plants. They are used in waste water treatment plants, power plants, refineries, mining and nuclear processes, food factories, and pipelines. Valve actuators play a major part in automating process control. The valves to be automated vary both in design and dimension. The diameters of the valves range from one-tenth of an inch to several feet.
Valves are a common final control element for a process control system to maintain pressure, temperature, composition, or other process quantities.