Structural Of Triple Offset Butterfly Valve

the axis of the valve stem deviates from the center of the disc and the center of the body at the same time, and the rotation axis of the valve seat has a certain angle with the axis of the passage of the valve body, it is called triple eccentric butterfly valve.

Characteristic Of Triple Offset Butterfly Valve

Triple offset Butterfly Valve also called triple eccentric butterfly valve.triple eccentric butterfly valve to high temperature, must use hard seal, but the leakage is large; To be zero leakage, must use soft seal, but not resistant to high temperature. In order to overcome the contradiction of double eccentric butterfly valve, the butterfly valve is eccentric for the third time. Its structural features are that the conical axis of the sealing surface of the butterfly plate is inclined to the cylinder axis of the main body while the axis position of the double eccentric valve stem is eccentric, that is to say, after the third eccentric, the sealing section of the butterfly plate is no longer true circle, but ellipse, and the shape of the sealing surface is asymmetric, one side is inclined to the center line of the main body, and the other side is parallel to the center line of the main body. The biggest feature of this third eccentricity is that it fundamentally changes the sealing structure, no longer the position sealing, but the torque sealing, that is, it does not rely on the elastic deformation of the valve seat, but completely depends on the contact surface pressure of the valve seat to achieve the sealing effect. Therefore, it solves the problem of zero leakage of the metal valve seat at one stroke, and because the contact surface pressure is proportional to the medium pressure High pressure and high temperature resistance can be easily solved.

Application Of Triple Offset Butterfly Valve

triple eccentric butterfly valve can be used for pressure up to 2500 pounds, temperature as low as – 196 ℃ and as high as 700 ℃, sealing up to 0, leakage and control ratio as high as 100:1. In other words, in all kinds of severe and critical process control pipelines, whether it is on-off valve or control valve, as long as the selection is appropriate, butterfly valve can be used safely now, and the cost is low.