Big size valves may also be used to supply the auxiliary systems in which the pressure may rise above the system pressure.Big size valves can be divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis).Big size valves are widely used in large water supply and drainage, fire protection, hvac, industrial system pipeline.To prevent medium backflow, check valves should be installed on equipment, devices and piping.

At present the Big size valve on the market depends on the pressure of the medium itself open, close valve disc, pressure loss is greater.A swing check valve is designed to increase the control part on the traditional valve body. When the check valve works normally, the disc is lifted to reduce the resistance of gas through the valve.When the system is out of power, the disc can fall freely, preventing the gas from flowing back.