Triple-offset Metal seated Butterfly Valve

Standard and Scope:

Design feature

Typical application:

Triple eccentric butterfly valve has widely application: Water works and water resource project, Environment protection, Power station, Building industry, Petroleum, chemical, Steel, metallurgy,Paper making industry , District heating, Especially in high temperature and high pressure condition with medium water, air , steam. In Sangong, Bi-directional Triple eccentric Metal seated Butterfly Valve is also available.

Three offset:

1. offset between axis and midline of body

2. offset between axis drill and disc sealing midline

3. offset of inclined cone

Floating seal ring and Multilayers seal ring

Unlike other traditional sealing structures (U type ring, O type ring, and Lip type ring), SGV triple offset metal seated butterfly valve has floating seal ring. Traditional sealing structure has some disadvantage: 1.the seat rings are formed by press process, they have severe concentrated stress, have a potential of deformation and leakage at high temperature. 2. the seat ring is over hardened in the heat treatment and has limit elasticity and excess brittleness, thus the seat ring might be easily broke for the fatigue due to consistent squeezing by the disc or long term work in low temperature. 3. the seat ring is just suitable for small size, if the seat ring of big size made by press, shape-setting and welding process, the welding point will be a potential leakage. SGV adopt multi layers seal ring (Flexible Graphite +Stainless steel), it is able to adjust itself by the pressure of disc when closing, so as to compensate the possible deformation or heat expansion under different working conditions. This structure avoid damage of the seal face and leads an even contact pressure ratio, means a long service life.

Streamlined Disc

Streamlined disc was designed so as to maximize flow, reduce flow resistance and save energy.