Question

The valve used for the prevention of reversal of flow in a pipeline is:
1. an air valve
2. a butterfly valve
3. a check valve
4. a scour valve

Answer 1

Correct Answer - Option 3 : a check valve

The different type of Valves and their purpose is given below in tabulated form:

Valve	Main Purpose
Gate Valve/Sluice Valve	Used for controlling the water flow by raising or lowering levels.
Ball Valve	Used for main water shut-offs and for branch line shutoffs
Globe Valve	Used to regulate or throttle the flow of water in plumbing applications such as outdoor faucets .
Butterfly Valve	Used for precisely adjusting the volume of flow
Air Valves	These valves ensure the safety of pipes against failure.
Drain/Scour/Blow Valves	There are provided to drain the water and scour of the settled suspended impurities out from pipe network.
Check/Reflux/non-Return Valve	These Valves ensure the flow of water only in one direction by avoiding the flow of water in opposite direction.