Summary:An NRV (Non-Return Valve or Check Valve) is a type of mechanical valve that allows fluid to flow in ...
An NRV (Non-Return Valve or Check Valve) is a type of mechanical valve that allows fluid to flow in only one direction. It is used to prevent fluid from flowing back through a system or to prevent backflow from contaminating clean fluid. The NRV-VS (Non-Return Valve with Visual Indication) is a type of NRV that has a visual indicator, such as a small ball or flag, to show the direction of flow.
The purpose of an NRV-VS is to allow fluid to flow in a specified direction while also providing a visual indication of the direction of flow. This can be useful for various applications, such as in piping systems, pumps, and other mechanical systems where it is important to know the direction of fluid flow.
The function of an NRV-VS is to open and allow fluid to flow in the desired direction when the pressure differential across the valve is sufficient. When the pressure differential decreases, the valve closes to prevent backflow. The visual indicator is used to show the direction of flow when the valve is open.