Ductile iron soft sealing gate valve is a valve body (nodular cast iron, nodular cast iron notes: the spheroidization and inoculation treatment to obtain spheroidal graphite, effectively improve the mechanical properties of cast iron, especially the plasticity and toughness, the opportunity to be higher than the strength of carbon steel) by high performance rubber and most new curing technology; overall coating, precision machining of stainless steel valve stem, three "O" type sealing ring, and non-toxic epoxy coating valve; widely used in tap water, sewage, fluid pipeline construction, petroleum, chemical, food, pharmaceutical, textile, electric power, shipbuilding, metallurgy, energy system as a regulator and the closure device.