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A sanitary fitting has a flange portion, a connector portion, and a parabolic entrance disposed therebetween. The flange portion has a planar ring surface that defines a central opening. The connector portion defines a lumen extending from the central opening toward an outlet port. The parabolic ent

A sanitary fitting has a flange portion, a connector portion, and a parabolic entrance disposed therebetween. The flange portion has a planar ring surface that defines a central opening. The connector portion defines a lumen extending from the central opening toward an outlet port. The parabolic entrance surface extends from the planar ring surface and transitions into the connector portion to define a portion of the lumen. One or more suction-relief ribs may be arranged along the surface of the flange portion and extend into the parabolic entrance. The suction-relief ribs may have a twisting curvature for causing rotation of fluid flow through the sanitary fitting.

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1. A sanitary fitting, comprising: a flange portion with a planar ring surface defining a central opening;a connector portion defining a lumen extending from the central opening toward an outlet port;a parabolic entrance surface extending from the planar ring surface and having a parabolic-shaped cr

1. A sanitary fitting, comprising: a flange portion with a planar ring surface defining a central opening;a connector portion defining a lumen extending from the central opening toward an outlet port;a parabolic entrance surface extending from the planar ring surface and having a parabolic-shaped cross section with a vertex located at a transition point between the planar ring surface and the parabolic entrance surface, and further transitioning into the connector portion to define a portion of the lumen; anda plurality of suction-relief ribs positioned around the central opening and configured to cause a vortex in fluid flow through the lumen. 2. The sanitary fitting of claim 1, wherein the vertex of the parabolic entrance surface is positioned at an interface of the planar ring surface and the parabolic entrance surface. 3. The sanitary fitting of claim 1, wherein a radius of a curvature at points along the parabolic entrance surface is 0.14×D, where D is a diameter of the lumen in the connector portion below the parabolic entrance surface. 4. The sanitary fitting of claim 1, wherein the parabolic entrance surface causes an increase laminar flow of fluid passing through the sanitary fitting as compared to other curved or squared port entrance geometries with a same lumen diameter in the connector portion. 5. The sanitary fitting of claim 1, wherein the parabolic entrance surface causes an increase in flow velocity of fluid passing through the sanitary fitting as compared to other curved or squared port entrance geometries with a same lumen diameter in the connector portion. 6. The sanitary fitting of claim 1, wherein the parabolic entrance surface causes an increase in flow volume rate of fluid passing through the sanitary fitting as compared to other curved or squared port entrance geometries with a same lumen diameter in the connector portion. 7. The sanitary fitting of claim 1, wherein the suction-relief ribs are spaced equiangularly around the central opening. 8. The sanitary fitting of claim 1, wherein the suction-relief ribs extend partially on the planar ring surface and partially along the parabolic entrance surface. 9. The sanitary fitting of claim 1, wherein the suction-relief ribs are formed with a twisting curvature extending along the parabolic entrance. 10. The sanitary fitting of claim 1, wherein a leading end of the suction-relief ribs is parabolic in shape. 11. The sanitary fitting of claim 1, wherein a top surface of the suction-relief ribs tapers towards the lumen in the connector portion. 12. The sanitary fitting of claim 1, wherein sidewalls of the suction-relief ribs comprise an airfoil shape. 13. The sanitary fitting of claim 1, wherein the lumen extending through the connector portion below the parabolic entrance surface is formed by a cylindrical wall of the connector portion. 14. The sanitary fitting of claim 1, wherein an outer diameter of the parabolic entrance surface is greater than a diameter of the lumen extending through the connector portion below the parabolic entrance surface. 15. A sanitary fitting, comprising: a flange portion defining a flat face and a central opening therein;a connector portion extending from the flange portion and defining an outlet port;a parabolic entrance to the outlet port formed by a continuous sidewall that defines the central opening extending from an inner perimeter edge of the flat face to the outlet port of the connector portion; anda suction-relief rib arranged along the flat face of the flange portion and extending into the parabolic entrance, wherein the suction-relief rib comprises a twisting curvature for causing rotation of fluid flow through the sanitary fitting. 16. The sanitary fitting of claim 15, wherein the suction-relief rib comprises a parabolic-shaped leading end. 17. The sanitary fitting of claim 15, wherein the suction-relief rib comprises a generally flat top surface that tapers downward to gradually decrease a height of the suction-relief rib as the suction-relief rib extends along the parabolic entrance toward the outlet port. 18. The sanitary fitting of claim 15, wherein: the suction-relief rib comprises sidewalls forming an airfoil shape extending generally normal to the flat face and parabolic entrance,the airfoil shape comprises a parabolic-shaped leading edge that transitions into the sidewalls;a thickness between the sidewalls remains substantially constant as the suction-relief rib extends along the flat face towards the parabolic entrance, andthe thickness between the sidewalls narrows as the suction-relief rib extends into the parabolic entrance and tapers to terminate at a trailing end. 19. The sanitary fitting of claim 18, wherein the sidewall comprises the twisting curvature as the suction-relief rib extends into the parabolic entrance. 20. The sanitary fitting of claim 18, wherein the suction-relief rib comprises a parabolically shaped top edge and sidewall. 21. A sanitary fitting comprising: a flange portion having a planar ring surface;a connector portion extending from the flange portion and defining a lumen therethrough having an axis normal to the planar ring surface; anda plurality of suction-relief ribs positioned at least partially on and protruding from the planar ring surface of the flange portion around an entrance opening to the lumen and configured to cause a vortex in fluid flow through the lumen. 22. The sanitary fitting of claim 21, wherein sidewalls of the plurality of suction-relief ribs comprise an airfoil shape having a leading edge that is wider than a trailing edge. 23. The sanitary fitting of claim 22, wherein the plurality of suction-relief ribs form a curved shape from the leading edge to the trailing edge.