Slip-on rubber duckbill check valves is an all-rubber construction, "duck-like" shap, with "positive inflows reverse check" a new type of water supply and drainage valves. Based on stress analysis and stress calculation for different conditions, different design mechanism, using different rubber formulations and produced by special technology. Positive work, water inflows from the intake, small water pressure, will be able to open the valve, pressure greater valve opening larger, more water flow. Reverse work, valve closed, seal check, back pressure greater valve tight seal better. XF rubber slow shut check valves are widely used in municipal water, sewage treatment and effluent discharge, preventing flooding back, is ideal for replacing door products.
