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A butterfly valve comprises a housing including a bore, a rotatable shaft passing through the bore, a disc mounted to the shaft for controlling the flow of a fluid through the bore, a thrust load reacting section and a wear interface. The thrust load reacting section includes a thrust plug assembled

A butterfly valve comprises a housing including a bore, a rotatable shaft passing through the bore, a disc mounted to the shaft for controlling the flow of a fluid through the bore, a thrust load reacting section and a wear interface. The thrust load reacting section includes a thrust plug assembled in a thrust reacting end of the shaft and a thrust plate secured to the housing. The thrust plate has a well for axially retaining the thrust plug and the thrust reacting end of the shaft. The wear interface includes a first contact region on the thrust plug with a first contact surface and a second contact region at the base of the well with a second contact surface. A portion of the first contact surface is spherical and in contact with a portion of the second contact surface.

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1. A butterfly valve comprising: a housing including a bore for passage of a fluid;a rotatable shaft passing through the bore, the shaft having a control end and a thrust reacting end;a disc mounted to the shaft within the bore for controlling the flow of a fluid passing through the bore;a thrust lo

1. A butterfly valve comprising: a housing including a bore for passage of a fluid;a rotatable shaft passing through the bore, the shaft having a control end and a thrust reacting end;a disc mounted to the shaft within the bore for controlling the flow of a fluid passing through the bore;a thrust load reacting section including a thrust plug fixed to the thrust reacting shaft end and a thrust plate fixed to the housing, the thrust plate having a well for retaining the thrust plug and the thrust reacting shaft end; anda wear interface with a first contact region on the thrust plug having a first contact surface and a second contact region at the base of the well having a second contact surface, the first and second contact regions in frictional contact at a first portion of the first contact surface and a second portion of a second contact surface;wherein the first contact surface is substantially spherical;wherein the first contact region includes tungsten carbide in a cobalt binder; andwherein the second contact region includes a hardface coating layer including a plurality of chromium-containing particles in a nickel alloy matrix. 2. The butterfly valve of claim 1, further comprising: a plug seat formed in the second contact surface;wherein a thrust load and relative motion of the substantially spherical first contact surface causes wearing of a spherical recess in the second contact surface to form the seat. 3. The butterfly valve of claim 1, wherein the first spherical contact region of the thrust plug has a minimum Rockwell “A” hardness value of at least about 91.8. 4. The butterfly valve of claim 1, wherein the first contact region has a spherical chord height, the spherical chord height measuring between about 40% and about 55% of a height of a clearance gap between the disc and an inner surface of the bore. 5. The butterfly valve of claim 1, wherein the hardface coating has a minimum Rockwell “C” hardness value of at least about 50. 6. The butterfly valve of claim 1, wherein the hardface coating is applied to the thrust plate by brazing. 7. The butterfly valve of claim 1, wherein the plurality of chromium-containing particles in the nickel alloy matrix comprise a non-incidental quantity of chromium borides or a non-incidental quantity of chromium carbides. 8. The butterfly valve of claim 7, wherein the plurality of chromium-containing particles comprise both chromium borides and chromium carbides. 9. The butterfly valve of claim 1, wherein the hardface coating layer is diffused into a substrate. 10. The butterfly valve of claim 9, wherein the substrate is a surface at the base of the thrust plate well. 11. The butterfly valve of claim 1, wherein the cobalt binder forms between 5.0 wt % and 6.5 wt % of the total weight of the first spherical contact region. 12. The butterfly valve of claim 11, wherein the first spherical contact region comprises less than 0.5 wt % niobium. 13. The butterfly valve of claim 11, wherein the first spherical contact region comprises less than 0.5 wt % titanium. 14. The butterfly valve of claim 11, wherein the first spherical contact region comprises less than 2.2 wt % tantalum. 15. An engine nacelle comprising: a bleed air inlet pipe; anda pressure regulating and shutoff valve disposed in the bleed air inlet pipe, the pressure regulating and shutoff valve comprising: a valve housing having a bore for passage of a fluid;a rotatable shaft passing through the bore, the shaft having a control end and a thrust reacting end outside the bore;a disc incorporated with the shaft inside the bore for controlling fluid flow; anda wear interface including a thrust plug disposed at the thrust reacting shaft end and a thrust plate secured to the housing, the thrust plate having a well for retaining the thrust plug and the thrust reacting shaft end; andwherein the thrust plug includes a first tungsten carbide contact region, and the base of the well includes a second wear-resistant contact region comprising a plurality of chromium-containing boride and carbide particles dispersed in a nickel alloy matrix, the nickel alloy matrix diffused into a base of the thrust plate well.