5 Types of Valves and their Symbols

Valves are mechanical devices that control the flow of fluids or gases in a piping system. There are different types of valves used in various industries, each with its unique features and characteristics. Here are five types of valves and their symbols used in piping and instrumentation diagrams (P&ID):

1. Gate Valve

A gate valve is a type of valve that controls the flow of fluid by using a gate that moves up and down to open and close the valve. It is represented in a P&ID by a rectangle with a diagonal line across it.

2. Globe Valve

A globe valve is a type of valve that controls the flow of fluid by using a plug that moves up and down to open and close the valve. It is represented in a P&ID by a circle with a cross inside it.

3. Ball Valve

A ball valve is a type of valve that controls the flow of fluid by using a ball that rotates to open and close the valve. It is represented in a P&ID by a circle with a diagonal line through it.

4. Butterfly Valve

A butterfly valve is a type of valve that controls the flow of fluid by using a disc that rotates to open and close the valve. It is represented in a P&ID by a circle with a half-circle inside it.

5. Check Valve

A check valve is a type of valve that allows fluid to flow in only one direction, preventing backflow. It is represented in a P&ID by a triangle pointing in the direction of the flow.

Understanding the symbols used in P&IDs for different types of valves is crucial in various industries such as oil and gas, chemical, and water treatment. By knowing the different types of valves and their symbols, individuals can better understand how they are used in piping systems and their role in various processes.