Introduction to double-eccentric PTFE-sealed butterfly valve Basic definitions and structural characteristics The double-eccentric PTFE-sealed butterfly valve is a type of valve that uses a disc-shaped opening and closing element to reciprocally rotate about 90° to open, close, and regulate the fluid passage. It has the following structural characteristics: Single-elastic PTFE valve seat: It can maintain a reliable seal without the use of additional sealing rings or metal components; it can main…