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Definition of Control Valves Unlike valves in a piping system that primarily serve to shut off, drain, fill, or divert, control valves are a part of an automated control system. They are considered the ‘‘final control element’’ in an automated and usually very sophisticated ‘‘control loop.’’ Aside from the control valve, the ‘‘loop’’ consists of a transmitter that measures the variable to be controlled (usually pressure, flow, level, or temperature) and a controller (nowadays
The following guidelines are provided to assist in selecting a suitable valve for any application. These guidelines are intended to cover all physical features and capabilities or limitations of different types of valves and which may be suitable for one particular application. The user must fully evaluate the pros and cons of using a particular type of valve and arrive at the most suitable selection, taking into consideration the life span expected and costs involved. Identi
A brief discussion is provided to assist the user in understanding the considerations affecting the selection of the type of actuators required for an application. Manually actuated valves do not change position due to a change in the mode of system operation or an accident. As such, a manually operated valve remains in the last position it was placed in. Manually operated valves are usually furnished with a hand wheel attached to the valve stem or yoke nut which is rotated c
Safety Valves and Pressure-Relief Devices Safety valves and pressure-relief valves are automatic pressure-relieving devices used for over pressure protection of piping and equipment. Safety valves (Fig. A10.32) are generally used in gas or vapor service because their opening and reseating characteristics are commensurate with the properties and potential hazards of compressible fluids. The valves protect the system by releasing excess pressure. Under normal pressure, the valv
Dear engineers, If you are searching for "Valves" or "Valves Types" the article below present all the information about valves types, installation and operation. Read Valves Types Part 1 Ball Valves The ball valve (Fig. A10.20) is a quarter-turn valve suitable for clean gas, compressed air, and liquid service. They also can be used for slurry service, but provisions for prevention of crud buildup must be made. The use of soft-seat materials such as nylon, delrin, synthetic ru