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A butterfly valve plate has a base that includes an outlet facing surface, an inlet facing surface that is opposed to the outlet facing surface, and an axis of rotation about which the plate rotates. The inlet facing surface has an asymmetric sinusoidal configuration between a first end and a second

A butterfly valve plate has a base that includes an outlet facing surface, an inlet facing surface that is opposed to the outlet facing surface, and an axis of rotation about which the plate rotates. The inlet facing surface has an asymmetric sinusoidal configuration between a first end and a second end of the inlet facing surface. A sinusoidal length defines a distance between the first and second ends. The axis of rotation is disposed off a midpoint of the sinusoidal length. In addition, or alternatively, the axis of rotation is disposed off a centerline between the inlet facing surface and outlet facing surface.

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1. A butterfly valve plate, comprising: a base that includes: an outlet facing surface;an inlet facing surface that is opposed to the outlet facing surface; andan axis of rotation about which the plate rotates;wherein the inlet facing surface consists of an asymmetric sinusoidal configuration that c

1. A butterfly valve plate, comprising: a base that includes: an outlet facing surface;an inlet facing surface that is opposed to the outlet facing surface; andan axis of rotation about which the plate rotates;wherein the inlet facing surface consists of an asymmetric sinusoidal configuration that consists of: a concave portion, a convex portion, and a planar portion between the concave and convex portions;wherein the concave portion is at a first distal end of the inlet facing surface;wherein the convex portion is at a second distal end of the inlet facing surface;wherein the valve plate is defined by a sinusoidal length that is a linear distance from the first distal end to the second distal end;wherein the axis of rotation is disposed off a midpoint of the linear distance;whereby the valve plate provides a constant torque across an entire range of motion of the valve plate. 2. The plate of claim 1, wherein the axis of rotation is disposed off a centerline between the inlet facing surface and the outlet facing surface;wherein the centerline is defined by a midpoint of a maximum height between the first distal end and a point on the outlet facing surface directly opposite the axis of rotation. 3. The plate of claim 1, wherein the plate rotates from about 30° to about 90° , with 0° being perpendicular to a direction of flow towards the plate. 4. The plate of claim 1, wherein the base further includes a sleeve. 5. The plate of claim 1, further including a stiffening arm affixed to the outlet facing surface. 6. A butterfly valve plate, comprising: a base that includes: an outlet facing surface;an inlet facing surface that is opposed to the outlet facing surface; andan axis of rotation about which the plate rotates;wherein the inlet facing surface consists of an asymmetric sinusoidal configuration between a first distal end and a second distal end of the inlet facing surface;wherein the asymmetric configuration consists of: a concave portion, a convex portion, and a planar portion between the concave and convex portions;wherein the axis of rotation is disposed off a centerline between the inlet facing surface and the outlet facing surfaces;wherein the centerline is defined by a midpoint of a maximum height between the first distal end adjacent the concave portion and a point on the outlet facing surface directly opposite the axis of rotation;whereby the valve plate provides a constant torque across an entire range of motion of the valve plate. 7. The plate of claim 6, wherein: the valve plate is defined by a sinusoidal length that is a linear distance from the first distal end to the second distal end;the axis of rotation is disposed off a midpoint of the linear distance. 8. The plate of claim 6, wherein the plate rotates about 60° , with 0° being perpendicular to a direction of flow towards the plate. 9. The plate of claim 6, wherein: the concave portion is defined by a concave length;the convex portion is defined by a convex length; andthe concave length is different from the convex length. 10. The plate of claim 6, wherein: the concave portion is defined by a concave height;the convex portion is defined by a convex height; andthe concave height is different from the convex height. 11. The plate of claim 6, wherein: the concave portion is defined by a concave radius;the convex portion is defined by a convex radius; andthe concave radius is different from the convex radius. 12. A butterfly valve assembly, comprising: a shaft;a base that rotates, about an axis of rotation, with the shaft and includes: an outlet facing surface;an inlet facing surface that is opposed to the outlet facing surface;wherein the inlet facing surface consists of: a concave portion, a convex portion, and a planar portion between the concave and convex portionswherein the concave portion of the first distal end is defined by a concave radius, a concave length and a concave height;wherein the convex portion of the second distal end is defined by a convex radius, a convex length and a convex height;wherein the concave radius of the first distal end is different from the convex radius of the second distal end;wherein the concave length of the first distal end is different from the convex length of the second distal end; andwherein the concave height of the first distal end is different from the convex height of the second distal end;wherein the axis of rotation is:off a midpoint of a sinusoidal length that is a linear distance from the first distal end to the second distal end;off a centerline between the inlet facing surface and the outlet facing surface;wherein the centerline is defined by a midpoint of a maximum height between the first distal end and a point on the outlet facing surface directly opposite the axis of rotation;whereby the base provides a constant torque across an entire range of motion of the valve plate assembly. 13. The assembly of claim 12, wherein the inlet facing surface has an asymmetric sinusoidal configuration. 14. The assembly of claim 12, wherein the concave length is greater than the convex length. 15. The assembly of claim 12, wherein the concave height is greater than the convex height. 16. The assembly of claim 12, wherein: the concave radius is greater than the convex radius.