Fluid end with transition surface geometry

A fluid end of a reciprocating pump, the fluid end comprising:

• a housing defining:
• a cross-bore;
• a first bore;
• a second bore intersecting with the first bore at a first intersection corner defining a first transition area, the second bore including a stepped transition feature at the first intersection corner, the second bore has a first portion with a first inner surface having a first inner diameter and a second portion with a second inner surface having a second inner diameter, the stepped transition feature includes a radiused transition located between the first portion and the second portion, the radiused transition including an angled surface, a first radiused surface located between the angled surface and the first inner surface of the first portion of the second bore, and a second radiused surface located between the angled surface and the second inner surface of the second portion of the second bore, the first radiused surface being curved and convex, the second radiused surface being curved and concave, the second inner surface of the second portion of the second bore being located adjacent to the cross-bore, the second inner surface of the second portion of the second bore being closer to the cross-bore than the first inner surface of the first portion of the second bore is to the cross-bore, the angled surface forms part of a cone-shaped bore, and the first inner diameter is smaller than the second inner diameter;
• and
• a third bore intersecting with the second bore at a second intersection corner defining a second transition area, wherein each of the first transition area and the second transition area includes its own surface, wherein each of the first intersection corner and the first transition area overlaps with a hemisphere profile.

A reciprocating pump, comprising:

• a housing defining:
• a cross-bore;
• a first bore;
• a second bore that intersects with the first bore at a first intersection corner defining a first transition area, the second bore including a stepped transition feature at the first intersection corner, the second bore has a first portion with a first inner surface having a first inner diameter and a second portion with a second inner surface having a second inner diameter, the second inner surface of the second portion of the second bore being offset from the first inner surface of the first portion of the second bore, the stepped transition feature includes a radiused transition located between the first portion and the second portion, the radiused transition including an angled surface, a first radiused surface located between the angled surface and the first inner surface of the first portion of the second bore, and a second radiused surface located between the angled surface and the second inner surface of the second portion of the second bore, the second inner surface of the second portion of the second bore being located adjacent to the cross-bore, the second inner surface of the second portion of the second bore being closer to the cross-bore than the first inner surface of the first portion of the second bore is to the cross-bore, and the first inner diameter is different than the second inner diameter;
• a third bore, the third bore intersecting with the second bore at a second intersection corner defining a second transition area;
• and
• a plunger reciprocally movable in the second bore of the housing.