How to select the triple eccentric and double eccentric butterfly valve?

Time: 2023-03-18

Publisher: Henan Yuda

According to the structure,butterfly valves are divided into concentric butterfly valves, single eccentric butterfly valves, double eccentric butterfly valves, triple eccentric butterfly valves, etc.As shown below

1.Double eccentric butterfly valve

Double eccentric butterfly valve is further improved on the basis of single eccentric butterfly valve.
Structural characteristics: The stem axis is off from both the center of the butterfly plate and the center of the body.
Advantages: The disc can be quickly detached from the seat after the valve is opened, eliminating unnecessary excessive extrusion and scraping, and improving the valve life.
Disadvantage: It is a line seal, which is used in applications with low requirements for closing position and low pressure-bearing capacity.

Yuda Valve double eccentric butterfly valve, from DN200-DN3400, pressure level ≤ PN25.

2、Triple eccentric butterfly valve

Triple eccentric butterfly valve continues to be modified on the basis of the structure of double eccentric butterfly valve.
Structural features: the stem axis deviates from both the center of the disc and the center of the body; the cone-shaped axis of the sealing surface of the disc deviates from the cylindrical axis of the body and belongs to the face seal.
Advantage: It realizes torque seal and solves the problem of zero leakage of metal valve seat, and because the contact surface pressure is proportional to the medium pressure, the resistance to high temperature and high pressure is also solved.

Yuda Valve triple eccentric butterfly valve, from DN50-DN4000 and pressure level ≤ PN63.