Double Offset Butterfly Valves - MGA Controls

double offset butterfly valve Offset butterfly valves are also referred to as excessive performance butterfly valves. The ‘Double Offset’ refers to the position of the shaft within the valve, and therefore the opening and closing motion of the disc. The shaft slightly moved back from the centreline of the valve, and also out of the centreline of the pipeline, making a cam-motion on which the disc rotates. This significantly increases performance and reliability by dramatically lowering friction throughout the principle part of the working cycle.

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There is no such thing as a upward motion of the stem in a non-rising stem kind. The valve disk is threaded internally. The disc travels along the stem like a nut when the stem is rotated. You can see the picture. In any such valve, stem threads are uncovered to the flow medium.

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