The additional offsets comprise of the following:

• Re-shaped seat cone changes the seating area from an elliptical to a circular shape, which will increase the Cv value of the valve
• The sharper angle of the seat on the shaft area eliminates the 10% rubbing that was still happening in Triple Offset Butterfly valves (in the 6 and 12 o’clock positions), resulting in 0% rubbing or friction, lower torque, and faster opening and closing

Seat Geometry

In the newly designed KU V-AXX® Five Offset butterfly valve, the seat shape can be changed around the whole seat without restrictions. If necessary, the seat’s angle, even in the shaft area, can be 25° or more, without changing the angle in other areas. This is only possible due to the unique seat design, which is not formed by a simple cone but by a much more complex figure, not yet named in geometry.

CV Valves

The KU V-AXX® 5-Offset butterfly valve has the highest Cv value of any comparable torque seated butterfly valve. Re-shaping the seat cone that changes the seating area from elliptical shape to circular increases the Cv value of the valve by 18-20% compared to Triple offset butterfly valves.

Having a higher Cv allows for smaller valve size options. The smaller valve has a lower torque value, which requires a smaller actuator. Therefore, a valve with a higher Cv value could potentially reduce the cost of the assembly significantly.

• New seat design; no friction or wear (0% rubbing)
• Suitable for erosive or slurry applications; the 0% rubbing minimizes the wear and erosion of the disc seal
• Full pressure-tight bi-directionally
• Suitable for applications from -270°C up to 1800°C
• Different disc seal design and materials available for various applications
• Body seat is solid metal and is in Inconel as standard
• Higher Cv value comparing to all torque seated valves in the marke.

The KU V-AXX® Five Offset design is suitable for extremely high or low-temperature applications or applications where the body and internals have different temperatures. We still need to achieve a tight shutoff with a metal seated configuration. This design has been used successfully in applications from -270°C up to 1800°C.