QUESTION
Objective Question
Which of the following is incorrect statement?
Answer
( Option B)
Sluice valves are provided to allow flow of water only in one direction, preventing back flow
Solution
(a) Correct Air valves (air-relief or air-release valves) are installed at summits (high points) of
a pipeline to release trapped air during filling/operation and to admit air during emptying,
thereby preventing vacuum formation.
(b) Incorrect Sluice valves (a type of gate valve) are used for isolation or on/off control of flow. They do not prevent backflow.
Prevention of backflow is the function of check valves (also called non-return valves or reflux valves).
(c) Correct Scour valves (also called wash-out valves) are provided at the lowest points of a pipeline so that the pipe can be completely emptied for cleaning, inspection or repair.
(d) Correct Gate valves are commonly used to regulate (start, stop or throttle) the flow of water in pipelines.
