Valves- Definition, Differences and Applications

Valves, Definitions and Applications

1.      Ball valve: used instead of butterfly less than 32 mm diameter: Is used to regulate the flow.

2.      Butterfly valve: used to control the flow and used instead of ball valve for > 32 mm

3.      Gate valve: it is used to completely turn off or turn on the flow which ball valve and butterfly valve is normally not used for

4.      Check valve: used for unidirectional flow and avoid back flow. Used normally in discharge line of pumps and where flow happens when certain pressure difference forces for back flow. Provided in the supply side of the machines to prevent backflow into the machine. It does not have any handles or whatever. So, it is easier to recognize.

5.      Strainer: mostly provided at inlet of the machines to avoid the waste enters the machine and damage them.

6.      Pressure relief valve: it allows the flow through other circuit when pressure exceeds in the required circuit and maintain to the required level.

7.      Expansion tank: used to avoid the bursting and overpressure in the pipeline by allowing the expansion in the expansion tank.

8.      Pressure switch: it activates the pump or other machineries when the pressure in the system it is sensing exceeds the certain pressure limit. 

Note: Ball valve and butterfly valve is not used to shut off completely the pipeline as they are incapable of it. It will keep the residual material in the circuit. But for complete control and shut off gate valve is used. 

  

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