Developed by Jiangsu Asia-Pacific Group, "XF rubber slow closing check valve," recently won the national new utility patents. Compared with the traditional valve, the new type of water supply and drainage valve has the obvious advantages of being able to be turned on and off automatically according to the water pressure difference, safe and reliable, noiseless, personnel-free and maintenance-free, and has the advantages of anti-corrosion, anti-aging, Strong, long life, the use of a wide range of features. It is widely used in water, municipal, sewage treatment and other outlets to prevent intrusion, backflow phenomenon.