Header ring

A header ring adapted to be engageable with a reciprocating, cylindrical member and a cylindrical wall of a housing in which the cylindrical member reciprocates, the header ring comprising:

• an annular body disposed about a primary axis, the annular body having an inner annular surface closest to the primary axis;
• an outer annular surface spaced radially outward from the inner annular surface;
• a first connecting surface extending between the inner annular surface and the outer annular surface;
• and a second connecting surface extending between the inner annular surface and the outer annular surface and spaced apart from the first connecting surface;
• wherein the inner annular surface has a first transition portion extending away from the primary axis and a second transition portion extending away from the primary axis with an elongated inner flat portion extending axially and linearly between the first transition portion and the second transition portion so as to be parallel with the primary axis;
• wherein the first transition portion extends away from elongated inner flat portion at an angle and wherein the first connecting surface extends away from outer annular surface at an angle and wherein the angles of the first transition portion and the first connecting surface are the same.

A header ring adapted to be engageable with a reciprocating, cylindrical member and a cylindrical wall of a housing in which the cylindrical member reciprocates, the header ring comprising:

• an annular body disposed about a primary axis, the annular body having an inner annular surface closest to the primary axis;
• an outer annular surface spaced radially outward from the inner annular surface;
• a first connecting surface extending between the inner annular surface and the outer annular surface;
• and a second connecting surface extending between the inner annular surface and the outer annular surface and spaced apart from the first connecting surface, wherein the second connecting surface is substantially flat and perpendicular to the primary axis;
• wherein the inner annular surface has a substantially flat first transition portion extending linearly away from the primary axis, a substantially flat second transition portion extending linearly away from the primary axis and an elongated inner flat portion intersecting each of the first transition portion and the second transition portion, the elongated inner flat portion extending axially and linearly between the first transition portion and the second transition portion so as to be parallel with the primary axis with a first corner formed at the intersection of the first transition portion and the elongated inner flat portion and a second corner formed at an intersection of the second transition portion and the elongated inner flat portion;
• and
• wherein the first corner is angled;
• wherein the second corner is filleted;
• wherein the angle between the second transition portion and the elongated inner flat portion is approximately 45°.