Valves Functions

　　Valve serve a various function within the piping system. Such as:

　　Stopping and starting a fluid flow. Depending on whether a valve is open or closed, it let pass the process fluid or halt the fluid.

　　Throttling the fluid flow. Some of the valves let you throttle the fluid depending open % of total opening. Lesser the opening higher the throttling and otherwise.

　　Controlling the direction of a fluid flow. Multiport valve lets you decide the way fluid will go.

　　Regulating a flow or pressure within the piping system. Some of the automatic control valves maintain the flow and pressure within the system by adjusting opening and closing.

　　Relieve pressure or vacuum from the piping system and equipment. Pressure and vacuum relief valve safeguard the process system from overpressure and during vacuum condition.

　　Different types of valves serve these functions. These valves can be classified or categorized based on;

　　Function

　　End connection

　　How it operates

　　Types of Actuator it used.

　　Classification of Valves Based on Function

In the above chart, you can see the types of valves and their function.

　　Isolation valve isolates or cuts the supply of fluid when needed. Gate, ball, plug, piston, diaphragm, butterfly and pinch valve falls under this category.

　　A control valve that regulates the flow of fluid falls in the regulation category. Globe, needle, butterfly, diaphragm, ball, plug, and pinch valve are used as a control valve. You can see that; some valves serve dual purposes such as globe and ball valve can be used as an isolation as well as a control valve.

　　Pressure and vacuum relief valve used to prevent overpressure and vacuum with the system that can damage the piping and equipment. Non-return valve such as swing and lift check valve prevents backflow within the system. Whereas, some valves are designed to serve a special purpose. Such as multiport, knife, and line blind valve.

　　Classification of Valves Based on Types of Actuator it Used

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