Butterfly valve sealing surfaces can be divided into three main categories. What are the characteristics of each category, and how should I choose? Butterfly valve manufacturer WEITEN GROUP, drawing on its successful selection and application experience in tens of millions of projects, has summarized the characteristics and main applications of these three types of sealing surfaces:

1. Metal Hard Seal Butterfly Valve

Main Features: It utilizes a "U"-shaped stainless steel sealing ring. This precision elastic sealing ring forms a three-dimensional eccentric contact with the polished butterfly disc. This solves the problem of traditional eccentric butterfly valves, where the sealing surfaces remain in sliding contact and friction during the 0° to 10° opening and closing phases. This ensures that the sealing surfaces separate upon opening and seal upon closing, extending service life and improving sealing performance.

Main Applications: Widely used in pipelines carrying corrosive media such as metallurgy, electricity, petroleum, chemical industry, air, gas, combustible gases, and water supply and drainage, with media temperatures ≤550°C. It is an excellent device for regulating flow and shutting off fluids.

2. Rubber Soft Seal Butterfly Valve

Main Features:

1. Novel and rational design, precise structure, light weight, and fast opening and closing.

2. Low operating torque, easy operation, and labor-saving and flexible operation.

3. Can be installed in any position, easy maintenance.

4. Replaceable seals ensure reliable sealing performance, achieving a bidirectional seal with zero leakage.

5. Sealing material is resistant to aging and corrosion, and has a long service life.

Main Applications: Soft seal butterfly valves are suitable for regulating flow and intercepting media in water supply and drainage, as well as gas pipelines for food, pharmaceutical, chemical, petroleum, power, textile, and papermaking industries, with temperatures ≤120°C and nominal pressures ≤1.6 MPa.

3. PTFE Sealed Butterfly Valve

Main Features:

1. Novel and rational design, precise structure, light weight, and fast opening and closing.

2. Low operating torque, easy operation, and labor-saving and flexible operation.

3. Can be installed in any position, easy maintenance.

4. The seals are replaceable, ensuring reliable sealing performance and zero leakage in both directions.

5. The sealing material is resistant to aging and corrosion, resulting in a long service life.

Main Application: This product consists of a PTFE-sealed butterfly valve with a stainless steel valve plate and stem. It is suitable for temperatures ≤ 250°C, mild corrosion conditions, or conditions with high cleanliness requirements. It is used for flow regulation and media interception in water supply, drainage, and gas pipelines in the food, pharmaceutical, chemical, petroleum, power, textile, and paper industries.