Question

What is the function of a non-return valve?

Allow the flow of liquid in one direction and prevents it from flowing back in opposite direction in a pipe flow system

Allows flow of liquid in a direction opposite to the pumping direction of liquid

Allow the flow of liquid in both upward and downward direction in a pipe flow system

Blocks the flow of fluid in all directions in a pipe flow system

Answer ( Option A)

Allow the flow of liquid in one direction and prevents it from flowing back in opposite direction in a pipe flow system

Solution

Function of a Non-Return Valve: A non-return valve, also known as a check valve, is a type of valve that allows fluid to flow through it in only one direction. This is crucial in preventing backflow, which could cause damage to equipment, contamination, or inefficient operation of a system.

Other Types of Valves:

• Gate Valve: Used to start or stop the flow of liquid in a pipeline. It operates by lifting a gate out of the path of the fluid. Gate valves are typically used in applications where a straight-line flow of fluid and minimum flow restriction are needed.

• Ball Valve: Uses a spherical ball with a hole through the middle to control flow. When the hole is aligned with the flow direction, the valve is open. When it is turned 90 degrees, the valve is closed. Ball valves are durable and provide a good seal.

• Butterfly Valve: Uses a rotating disc to control the flow of liquid. The disc is positioned in the center of the pipe and rotates to allow or block the flow. Butterfly valves are compact and provide quick shut-off.

• Globe Valve: Used for regulating flow in a pipeline. It consists of a movable plug or disc element and a stationary ring seat in a generally spherical body. Globe valves are suitable for applications where flow needs to be adjusted frequently.

• Diaphragm Valve: Uses a diaphragm that is pressed against a seat to control flow. It is commonly used in applications requiring sanitary conditions, such as in the pharmaceutical and food industries.