The role of the check valve in the system

The role of non-return valve in the pipeline is to prevent backflow of liquid, it is in high-rise buildings and boiler piping systems, pumping stations has been widely applied. From the valve's internal structure, can be divided into lift check valves and  Instrument needle valves  valves are two, lift check valve is divided into horizontal and vertical, respectively, for horizontal lines and vertical tube on the road, while the swing check valve applies both for vertical and horizontal pipe lines. Swing check valve Swing check valve back on pills Schematic structure and  Male connector  check valves. Check valve for pump pressure water pipe or pressure piping systems large fluctuation when, can prevent backflow of liquid, protective equipment or the normal operation of the pump unit. Check valve in this system is the role of: fill the water tank can be added through the check valve to the expansion tank, expansion tank while preventing the backflow of water covering the tank, the use of check valves should pay attention to the following questions.