High pressure check valve flange joint

A valve flange joint comprising:

• an annular valve flange oriented about a centerline and having a first valve flange face and a second valve flange face, wherein the first and second valve flange faces extend in a radial direction perpendicular to the centerline and a first thickness is defined as a minimum distance between the first flange face and the second flange face;
• an annular first duct flange oriented about the centerline and having a first mating portion, wherein the first mating portion includes a first outer surface and a first duct face in contact with the first valve flange face that extends between a first seal groove and a first rim, and wherein a second thickness is defined as the minimum distance between a shoulder of the first seal groove and the first outer surface;
• and
• an annular second duct flange oriented about the centerline and having a second mating portion, wherein the second mating portion includes a second outer surface and a second duct face in contact with the second valve flange face that extends between a second seal groove and a second rim, and wherein a third thickness is defined as the minimum distance between a shoulder of the second seal groove and the second outer surface;
• and
• wherein a ratio between the first thickness and the second thickness is between 0.8:1.0 and 1.2:1.0, and a ratio between the first thickness and the third thickness is between 0.8:1.0 and 1.2:1.0.

A check valve assembly oriented about a centerline, the check valve assembly comprising:

• an annular valve flange that includes a tab, a first valve flange face and a second valve flange face, wherein a first thickness is defined as a minimum distance between the first valve flange face and the second valve flange face;
• an annular first duct flange that includes a first mating portion, wherein the first mating portion includes a first outer surface, a first duct rim, a first duct face in contact with the first valve flange face, and a first slot, and wherein the first duct face includes a first groove, and wherein a second thickness is defined as a minimum distance between a shoulder of the first groove and the first outer surface;
• and
• an annular second duct flange that includes a second mating portion, wherein the second mating portion includes a second outer surface, a second duct face in contact with the second valve flange face, and a second rim, and wherein the second duct face includes a second groove, and wherein a third thickness is defined between a shoulder of the second groove and the second outer surface;
• and
• wherein the tab extends in an axial direction through the first slot, and wherein an inner surface of the tab is radially inward of an outermost portion of the second mating portion;
• and
• wherein a ratio between the first thickness and the second thickness is between 0.8:1.0 and 1.2:1.0, and a ratio between the first thickness and the third thickness is between 0.8:1.0 and 1.2:1.0.