Fracturing pump arrangement using a plunger with an internal fluid passage

A fluid end, comprising:

• a first section comprising a plurality of plunger bores formed therein, each plunger bore joining opposed first and second threaded openings formed in the first section;
• a plurality of second sections, each second section configured to thread at least partially into a selected one of the second threaded openings, each second section comprising a through bore coaxially aligned with a selected plunger bore;
• and
• a plurality of reciprocating plungers, each plunger configured to extend at least partially within a selected through bore and at least partially within a selected plunger bore, in which each plunger comprises:
• a first end and an opposed second end;
• a blind suction bore formed on the first end;
• a suction fitting bore formed perpendicular to the suction bore;
• a sleeve installed within the suction bore;
• and
• a valve seat installed within the first end of the plunger such that the sleeve is situated intermediate the valve seat and the second end of the plunger;
• in which the number of second sections is the same as the number of plunger bores.