The United States 3-A is a non-profit voluntary organization (referred to as 3-A SSI), which is committed to promoting the hygienic design of food production equipment, beverage production equipment, dairy equipment, and pharmaceutical industry equipment. It mainly promotes production equipment to contact media Health and safety. We have obtained the certification of 10 series of products of 3-A organization. So far in the field of pump and valve, we are the Asian company who has passed the most certification of this organization, covering ≈ 80% of series products. Diaphragm valve series certificate: 3-A-54-02-N.O. 1580, specifically covering: manual, pneumatic, electric, straight-through, three-way, multi-channel and other structural diaphragm valves.