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FlowBiz Triple Eccentric Flanged End Butterfly Valve:
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What is a Triple Offset Butterfly Valve?
The Triple offset butterfly valve has three separate offsets. Two balances are at the base, and the third offset is on the sealing surface, making a cone-like form of the disk and the seat. Triple offset valves are operated where a bubble-tight seal is needed, the method is under high temperatures, and difficult sealing with zero leakage is required.
The first offset is provided to the mid-axis of the sealing surface, in which the disc turns 360 degrees around the middle axis to provide sealing by bending the soft seal, resulting in total variance.
The second offset refers to the part of the pole that supports the bore's centerline. During the procedure, it produces a cam activity to lift the seat away from the seal, resulting in friction during the first 10 degrees of opening and the last 10 degrees of closing.
The third offset is the closing elements. Each sealing part is machined into a conical offset shape, which results in a right-angled cone. Throughout its working cycle, this ensures friction-free stroking. Connection is only made with the 90° angle functioning as an automatic stop at the last point of closing; this results in no over-travel of the disc seat.
Classification by Connection Type:
Based on the connection, there are additional types of triple-offset butterfly valves.
- Wafer-type ends.
- Lug-type ends.
- Both flanged ends.
- Butt-welded types end.