Butterfly valve and butterfly disc
AssigneeVelan Inc.
InventorsStanley Isbitsky, Bob Waditschatka, François Jouan, Nicolas Hervé François Lourdel, Gordon Stovel
Life of this patent
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Abstract
An offset butterfly valve comprising a butterfly disc which receives a splined valve stem is disclosed. The butterfly disc is positioned for sealing an annulus formed in the valve housing when the valve stem is rotated from an open position to closed position. Provision of the spline towards the center of the valve stem and the butterfly disc allows the butterfly disc to move along the valve stem. In a particular embodiment a valve seal is secured to the butterfly disc using a securing disc which is threaded into a threaded cylinder concentric with the butterfly disc.
Claims17
A butterfly valve comprising:
- a valve body comprising an annulus having an inner surface defining an aperture arranged about a flow path and comprising a valve seat and a pair of aligned and opposed first and second stem receiving bores arranged along a bore axis substantially at right angles to said flow path;
- a butterfly disc positioned within said aperture and comprising a round disc body having a first surface, a ring seal sized for extending beyond an outer periphery of said disc body and engaging with said valve seat to close said aperture, a second surface opposite said first surface comprising a raised part extending substantially completely across said disc body about a third stem receiving bore arranged along said bore axis, said third bore behind and generally in parallel to said first surface, and a female spline positioned within said third bore centrally between a first bore opening and a second bore opening and a re-enforcement extending away at right angles to and on either side of said raised part in the region of said female spline to said outer periphery, said re-enforcement having a width greater than a length of said female spline and an outer surface forming a smooth curved transition between said raised part and said outer periphery;
- a stem inserted into said first, second and third bores along said bore axis, said stem spanning said aperture and comprising a male spline slideably engaging said female spline to transfer a rotation from said stem to said butterfly disc, a first end extending from said first bore beyond said valve body and a second end secured within said second bore;
- and
- an actuator secured to said first stem end, wherein using said actuator said butterfly disc is rotatable between an open position wherein said flow path is open and said butterfly disc is slidable along said stem within said annulus and a closed positioned wherein said butterfly disc self-positions along said stem such that said seal is engaged with said valve seat and said flow path closed.
A butterfly disc for use in a butterfly valve having an inner surface defining an aperture arranged about a flow path and comprising a valve stem and a valve seat, the butterfly disc comprising:
- a round disc body comprising a first surface and a second surface opposite said first surface comprising a raised part extending substantially completely across said disc body about a valve stem receiving bore behind and generally in parallel to said first surface, a female spline positioned within said bore centrally between a first bore opening and a second bore opening and a re-enforcement extending away at right angles to and on either side of said raised part in the region of said female spline to a disc body outer periphery, said re-enforcement having a width greater than a length of said female spline and an outer surface forming a smooth curved transition between said raised part and said outer periphery;
- and
- a ring seal sized for extending beyond an outer periphery of said disc body and engaging with the valve seat to close the aperture.
A butterfly disc for use in a butterfly valve having an inner surface defining an aperture arranged about a flow path and comprising a valve stem and a valve seat, the butterfly disc comprising:
- a round disc body comprising a front surface, a valve stem receiving bore behind and generally in parallel to said front surface and a raised cylindrical portion concentric to and extending from said front surface;
- an annular ring seal comprising an inner radius sized for fitting over said raised cylindrical portion and an outer radius extending beyond an outer periphery of said disc body and engaging with the valve seat to close the aperture;
- a securing ring comprising a threaded inner edge;
- and
- a lock for preventing said securing ring once installed on said central portion from being removed;
- said cylindrical central portion further comprising a threaded outer edge complementary to said threaded inner edge and further wherein said securing ring is threadable onto said cylindrical central portion for pressing said seal against said front surface.
Dependencies are inferred from the claim text.