Butterfly Valve – double offset (soft seat)
Butterfly Valve – KKD-83
Triple Offset Butterfly Valves with metal seat are designed for high-temperature and high-pressure applications, and are well-suited for applications requiring bi-directional zero leakage. These provide space and weight savings while minimizing installation and maintenance costs.
The triple offset butterfly valve has 3 offsets. In addition to the two offsets in the double offset butterfly valve, the third offset is achieved by altering the geometry of the sealing component. The seat is machined into an offset conical profile resulting in a right-angled cone. The third offset eliminates rubbing and reduces wear between the seat and seal ring during operation. There is no friction as the seal ring will immediately leave the valve seat when the valve isopened. Contact is only only made at the final point of closure. Once the seat and seal ring are in contact, torque is applied to create a bi-directional bubble tight seal.
A triple offset butterfly valve has three separate offsets from the valve body’s center.
The 'cam-controlled' and 'right-angle' conical seal design ensures that the metallic sealing components do not touch until the valve is finally closed.
This results in repeatable sealing and a significant increase in valve life.
Triple offsets are generally used in applications similar to gate valves, where and tight shutoff and/or quarter turn actuation is desired.