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Regarding this, what is sluice valve?

Sluice Valve functions strictly to either start or stop the flow. Sluice gate, knife gate, and slide gate are used interchangeably in the water and wastewater control industry. They are designed to control the flow of fluid through a pipe it works by raising or lowering a wedge that blocks flow.

Beside above, what is the use of air valve? Air valves are hydromechanical devices designed to automatically release air and wastewater gases or admit air during the filling, draining or operation of liquid piping systems for water and wastewater services.

Furthermore, what is the difference between sluice valve and gate valve?

It has no A gate valve and a sluice valve both are linear motion valves and are used to start or stop the flow of the fluid in piping. The difference between a gate valve and a sluice valve is that a gate valve is used for closed pipelines on the other hand sluice valve is used for open systems such as dams.

How many types of valves are there?

Learn about 9 Different Types of Valves used in Piping such as Gate Valve, Globe Valve, Check Valve, Plug valve, Ball Valve, Butterfly Valve, Needle Valve, Pinch Valve and Pressure Relief Valve.