Slow shut check valve, also known as check valve or check valve, its role is to prevent the backflow  medium pipeline. Open-close part by medium flow and power to open or closed, to prevent the  backflow medium valve check valve. Check valve belong to automatic valve class, mainly for the one-way  flow of medium pipeline, only allowed to medium flows in one direction, in order to prevent accidents.  This valve shall generally be installed in the pipeline. Slow close check valve is installed in the high-rise  building water supply system and other water supply system of the pump outlet, prevent the backflow  medium, water hammer and the intelligent valve water hammer phenomenon. The valve with electric  valve, check valve and water hammer eliminator three kinds of function, can effectively improve the  safety and reliability of water supply system, and will slowly open, quick closing, slowly-closing eliminate  water hammer principle of technology integration, to prevent pumping water hammer and water  hammer pump is going to produce. Just water pump motor open/close button operation, the valve  can be according to the water pump operating rules automatically opening and closing, large flow,  small pressure loss.