The check valve is used in the pipeline system, and its main function is to prevent the backflow of the medium, the reverse rotation of the pump and its driving motor, and the discharge of the medium in the container. Check valves can also be used on lines supplying auxiliary systems where the pressure may rise above the main system pressure. It can be installed horizontally or vertically. It can be used for cold water, hot water, industrial and domestic sewage pipe networks, and is more suitable for submersible sewage pumps. The medium temperature is 0-80 °C. It can be installed at the water outlet of the pump to prevent backflow and water hammer from damaging the pump.​​

HQ44X single-ball micro-resistance spherical check valve and HQ45X double-ball micro-resistance spherical check valve all use rubber covered balls as valve discs. To open or close the valve. The main features of HQ44X single-ball micro-resistance spherical check valve and HQ45X double-ball micro-resistance spherical check valve are large flow rate, small flow resistance pressure loss, good sealing performance, silencing and closing, which can reduce water shock waves. Can be installed horizontally or vertically. Micro-resistance spherical check valve can be used for the pump outlet of cold water, hot water, industrial and domestic sewage and other pipeline networks to prevent the backflow of the medium. In order to prevent the backflow of the medium, check valves should be installed on equipment, devices and pipelines

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