Low friction and gradually opening butterfly valve vane
OwnerHans D Baumanninventor
Life of this patent
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Abstract
The invention relates to vanes used in butterfly valves utilized in fluid control systems requiring special relationships between passing fluid and vane rotation and furthermore can provide leak proof shut-off when in the closed valve position and due to the extended contact length between the vane and the valve bore assures low opening friction. The invention furthermore features a shape that greatly reduces the customary high dynamic torque created by fluid suction effects on a vane when in the open position.
Claims6
A low friction and gradually opening butterfly valve vane comprising a tilted disk having an upper half 2a and a lower half 2b separated by a central hub 4 dissecting said vane, said hub having a central bore 5 to accommodate a shaft, each disk portion having a horizontal rim 6 extending beyond the thickness of the disks and comprising a flattened portion 7 and two rounded edges 8 along most of the outer circumference of said vane, and wherein the horizontal length of said rims diminish along the circumference of the vane starting from the top of the vane towards the hub and likewise from the bottom of the vane towards the hub and wherein the maximum length of the flattened section 7 of each of the rims 6 extends from the intersection of said flattened portions with an axis 13 centering the tilted vane to a vertical axis 12, both axes passing through the center of bore 5, and both flattened rim portions 7 are configured to engage a surface 11 of a butterfly valve passage 10, when the vane is in the closed valve position, and wherein at least one disk portion together with an extended portion of said rim forming a recess 14 capable to impinge fluid flowing through the valve passage when the valve is in the open position.
Dependencies are inferred from the claim text.