The food-grade welded diaphragm valve is remotely controlled by the driving device or manually operated by the handle. The driving device has three standards: normally closed type, normally open type and gas type. It has the advantages of simple structure, beautiful appearance, quick disassembly and assembly, flexible operation, small fluid resistance, safe and reliable use, etc. It is suitable for the control of water, gas, oil and corrosive media in chemical industry, petroleum, metallurgy, water heating, food, pharmaceutical and other industries.