Match the list-1 with list-2 and select the correct answer using the codes given below,

List-1 (Name of the valve)	List-2 (Purpose of the valve)
a. Reflux valve	1. Drain out the waste water from dead end
b. Sluice valve	2. Relieving water hammer pressure
c. Pressure relief valve	3. Control the flow in the distribution system at corner and pipe junction
d. Scour valve	4. Allow the flow only in one direction

Explanation:

Reflux Valve (Check Valve)

• Allows flow only in one direction — prevents backflow in pipelines.

• Commonly used in pumping systems to stop water from flowing backward when pumps are turned off.

• Essential in maintaining system efficiency and preventing contamination from reverse flow.

 Additional Information

Sluice Valve

• Controls the flow in the distribution system, particularly at pipe junctions and corners.

• Works like a gate to completely open or shut flow in a pipeline.

• Used for isolating sections of the water distribution network during maintenance or repair.

Pressure Relief Valve

• Protects the system from excessive pressure by releasing water when pressure exceeds safe limits.

• Helps in relieving water hammer and overpressure situations, preventing damage to pipes and fittings.

• Used in pressurized water systems and pump installations.

Scour Valve

• Installed at low points or dead ends of pipelines to drain out waste water, sediments, or debris.

• Helps in cleaning and maintenance of pipelines.

• Regular operation of scour valves ensures better water quality and prolongs pipe life.