Fluid end assembly

1 . A fluid end, comprising:

an insert comprising a beveled surface;

a fluid routing plug, comprising:

an outer surface;

an annular shoulder; and

a stress relief cutout defined on a surface of the fluid routing plug between the outer surface and the annular shoulder;

in which the annular shoulder is configured to abut the insert; and

a housing containing both the insert and the fluid routing plug.

2 . The fluid end of claim 1 , in which the stress relief cutout is in a spaced relationship with the insert.

3 . The fluid end of claim 1 , in which the fluid routing plug does not engage the insert at the stress relief cutout.

4 . The fluid end of claim 1 , in which the insert is made of a harder material than a material used to make the housing.

5 . The fluid end of claim 1 , in which the insert is made of tungsten carbide.

6 . The fluid end of claim 5 , in which the housing is made of stainless steel.

7 . A fluid routing plug configured to be situated within a fluid end, the fluid routing plug comprising:

a body having a first surface and an opposed second surface joined by an outer intermediate surface, the outer intermediate surface comprising:

an annular shoulder formed therein;

an annular groove formed therein; and

a stress relief cutout formed therein and situated intermediate the annular shoulder and the annular groove;

a longitudinal axis extending through the body and both the first and second surfaces;

a plurality of first fluid passages interconnecting the first surface and the outer intermediate surface; and

a plurality of second fluid passages interconnecting the first surface and the second surface.

8 . The fluid routing plug of claim 7 , in which the annular groove is configured to receive an annular seal.

9 . The fluid routing plug of claim 7 , in which the annular shoulder is configured to abut a wear ring; in which the stress relief cutout is in a spaced relationship with the wear ring.

10 . The fluid routing plug of claim 7 , in which the annular groove is defined as a first annular groove; in which the body further comprises a second annular groove formed on the intermediate surface, the second annular groove configured to receive an annular seal.

11 . The fluid routing plug of claim 7 , in which the stress relief cutout comprises:

a planar section; and

a curved section;

in which the curved section is situated intermediate the outer intermediate surface and the planar section.

12 . The fluid routing plug of claim 11 , in which the planar section is situated intermediate the annular shoulder and the curved section.

13 . A fluid end, comprising:

a fluid end housing;

the fluid routing plug of claim 7 ; and

a wear ring abutting the annular shoulder of the body.

14 . The fluid end of claim 13 , in which the wear ring does not contact the stress relief cutout.

15 . The fluid end of claim 13 , in which the wear ring comprises:

a first surface engaging the annular shoulder;

a second surface opposed to the first surface and engaging a portion of the fluid end housing;

an inner intermediate surface bound between the first and second surfaces;

an outer intermediate surface bound between the first and second surfaces; and

a first bevel formed intermediate the first surface and the outer intermediate surface.

16 . The fluid end of claim 15 , in which the wear ring further comprises:

a second bevel situated intermediate the inner intermediate surface and the second surface.

17 . The fluid end of claim 16 , in which the first bevel is larger than the second bevel.

18 . The fluid end of claim 13 , in which the fluid end housing comprises:

a longitudinal bore formed therein; and

a valve pair situated within the longitudinal bore, the valve pair configured to engage the fluid routing plug.

19 . A fluid routing plug configured for use within a fluid end assembly comprising a housing and an annular wear ring, the fluid routing plug comprising:

an annular seal engaging the annular wear ring; and

a body defining an annular shoulder, the annular shoulder comprising:

a cutout section;

in which the cutout section does not contact the annular seal or the annular wear ring.

20 . An apparatus, comprising:

a fluid end comprising a housing;

a fluid routing plug situated within the housing; and

a wear ring situated within the housing and configured to abut the fluid routing plug, the wear ring comprising:

a first surface configured to abut the fluid routing plug;

a second surface opposed to the first surface;

an intermediate surface situated between the first and second surfaces; and

a stress relief cutout situated between the intermediate surface and the first surface, in which the stress relief cutout does not contact the fluid routing plug.

21 . The apparatus of claim 20 , in which the wear ring further comprises:

a bevel situated between the intermediate surface and the stress relief cutout, in which the bevel does not contact the fluid routing plug.

22 . The apparatus of claim 21 , in which the bevel comprises:

a first radius joining the stress relief cutout;

a second radius joining the intermediate surface; and

a linear section situated between the first and second radii.

23 . The apparatus of claim 20 , in which the stress relief cutout comprises:

a planar section;

in which the planar section is angled with respect to the first surface at a non-zero angle.

24 . The apparatus of claim 23 , in which the non-zero angle is 5 degrees.

25 . An apparatus, comprising:

a fluid routing plug, comprising:

an outer surface;

an annular shoulder; and

a stress relief cutout defined on a surface of the fluid routing plug between the outer surface and the annular shoulder;

in which the annular shoulder is configured to abut an insert, the insert comprising a beveled surface; and

in which the fluid routing plug is configured to be closely conformable to a wall of an elongate bore formed within a fluid end housing.