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Q: The valve which allows uni-directional flow of water in a pipe is called _____ .
  • A. drain valve
  • B. pressure relief valve
  • C. reflux valve
  • D. air relief valve
Correct Answer: Option C - A valve which allows water to flow only in one direction and prevent it from flowing in the reverse direction is called as reflux valve. Check valve or reflux valve or non-returning valve: In this process some automatic device which allows the water to flow in one direction only. • This valve is provided in the pipe line which draws water from the pump. • When the pump is operated, the valve is opened but when the pump is suddenly stopped the valve is automatically closed and the water is prevented from returning to the pump. Drain valve : A valve used to drain off material that has separated from a fluid or gas stream, or one used to empty a process line, vessel or storage tank. Pressure relief valve : The pressure relief valve are also known as relief valve or cut-off valves or safety valve. • When the pressure of the water suddenly exceeds the permissible pressure due to water hammer phenomenon. Then the valve is opened automatically and the excess pressure is released instantaneously. Thus the pipe line is protected from bursting. Air relief valve : This is also known as pressure relief valves. • The water flowing through the pipe line always carries same air with it. • This air tends to accumulate at the summit of pipe line. • Due to the accumulation of air, a backward pressure is created which causes a blockage to the flow of water. So, the air relief valve is provided at the summit to release the air pressure.
C. A valve which allows water to flow only in one direction and prevent it from flowing in the reverse direction is called as reflux valve. Check valve or reflux valve or non-returning valve: In this process some automatic device which allows the water to flow in one direction only. • This valve is provided in the pipe line which draws water from the pump. • When the pump is operated, the valve is opened but when the pump is suddenly stopped the valve is automatically closed and the water is prevented from returning to the pump. Drain valve : A valve used to drain off material that has separated from a fluid or gas stream, or one used to empty a process line, vessel or storage tank. Pressure relief valve : The pressure relief valve are also known as relief valve or cut-off valves or safety valve. • When the pressure of the water suddenly exceeds the permissible pressure due to water hammer phenomenon. Then the valve is opened automatically and the excess pressure is released instantaneously. Thus the pipe line is protected from bursting. Air relief valve : This is also known as pressure relief valves. • The water flowing through the pipe line always carries same air with it. • This air tends to accumulate at the summit of pipe line. • Due to the accumulation of air, a backward pressure is created which causes a blockage to the flow of water. So, the air relief valve is provided at the summit to release the air pressure.

Explanations:

A valve which allows water to flow only in one direction and prevent it from flowing in the reverse direction is called as reflux valve. Check valve or reflux valve or non-returning valve: In this process some automatic device which allows the water to flow in one direction only. • This valve is provided in the pipe line which draws water from the pump. • When the pump is operated, the valve is opened but when the pump is suddenly stopped the valve is automatically closed and the water is prevented from returning to the pump. Drain valve : A valve used to drain off material that has separated from a fluid or gas stream, or one used to empty a process line, vessel or storage tank. Pressure relief valve : The pressure relief valve are also known as relief valve or cut-off valves or safety valve. • When the pressure of the water suddenly exceeds the permissible pressure due to water hammer phenomenon. Then the valve is opened automatically and the excess pressure is released instantaneously. Thus the pipe line is protected from bursting. Air relief valve : This is also known as pressure relief valves. • The water flowing through the pipe line always carries same air with it. • This air tends to accumulate at the summit of pipe line. • Due to the accumulation of air, a backward pressure is created which causes a blockage to the flow of water. So, the air relief valve is provided at the summit to release the air pressure.