Fluid end with counterflow passages

A fluid end body of a fluid end, the fluid end body comprising:

• a first bore segment comprising a suction chamber, wherein the first bore segment is configured to interface with a reciprocating element that creates suction and discharge pressures in the suction chamber;
• a second bore segment configured to receive fluid from the first bore segment and direct fluid toward an exterior of the fluid end body;
• and
• a plurality of passages integrally formed into the fluid end body, wherein the plurality of passages is configured to direct fluid into the first bore segment and then into the second bore segment, and wherein passages of the plurality of passages are intertwined with one another.

A fluid end, comprising:

• a casing;
• an inlet formed through an external surface of the casing;
• a first bore segment formed in the casing to define a suction confluence region;
• a second bore segment formed in the casing to define a discharge confluence region;
• a suction passage integrally formed in the casing and extending from the inlet to the suction confluence region;
• and
• a discharge passage integrally formed in the casing and extending from the suction confluence region to the discharge confluence region, wherein the suction passage and the discharge passage are intertwined with one another.