Soft seated butterfly valve is a concentric butterfly valve using PTFE or rubber as sealing material. Compared with multi‑layer metal hard‑sealed butterfly valves, it is not only lower in cost but also delivers better sealing performance, achieving zero leakage standard under both air pressure and water pressure tests. Adopting concentric vertical disc structure, the valve is symmetric on both sides centered on the stem. It is a bi‑directional sealing butterfly valve without flow direction restriction.

Application Fields

Soft seated butterfly valves are widely used in petroleum, chemical, metallurgy, municipal and other industries for various medium working conditions such as tap water, wastewater and exhaust discharge, powder conveying, gas transportation, circulating water and oil delivery. Normally, sizes below DN200 adopt handle operation, while sizes above DN200 are equipped with worm gear drive for easier operation.

1. Selection of Sealing Materials & Applicable Conditions

2. Material Options for Main Components

3. Features of Soft Seated Butterfly Valve

1. Double eccentric structure realizes tighter sealing when closing, providing reliable sealing performance.

2. Sealing pair adopts stainless steel matched with oil‑resistant NBR, achieving long service life.

3. Rubber sealing ring can be installed on valve body or disc to adapt to different media for customer selection.

4. Frame‑type disc features high strength, large flow area and low flow resistance.

5. Integral baking finish effectively prevents corrosion. It can be adapted for different media simply by replacing the seat sealing material.

6. Bi‑directional sealing function, free from medium flow direction and installation space restrictions, can be mounted in any orientation.

7. Unique structure, flexible, labor‑saving and convenient operation.

4. Main Structural Parameters

Main Overall Connection Dimensions (Unit: mm)