H41f plastic bottom valve, light weight, easy installation; Connection methods: flange type, socket welding type, thread type; The product structure forms are: floating ball type, automatic flap large flow type, which can be used together with various centrifugal pumps and self-priming pumps. The product has novel structure, superior sealing performance, acid, alkali and corrosion resistance, and long service life. It is widely used in chemical industry, chemical fiber, chlor alkali, electric power, pharmacy, pesticide, dye, smelting, food, sewage treatment, mariculture and other industries.