Reciprocating pump with dual circuit power end lubrication system

A reciprocating pump with a dual circuit lubrication system, comprising:

• a fluid end coupled to a power end, the fluid end configured to supply fluid at a high pressure into a wellbore;
• a first lubrication pump of a high pressure lubrication circuit supplying a lubrication fluid to the power end;
• a second lubrication pump of a low pressure lubrication circuit supplying lubrication fluid to the power end, a first lubrication fluid pressure of the high pressure lubrication circuit being higher than a second lubrication fluid pressure of the low pressure lubrication circuit, the first and second lubrication pumps operating in parallel;
• and
• at least one pressure control valve configured to maintain at least one of the lubrication fluid in the low pressure lubrication circuit at the second lubrication fluid pressure and the lubrication fluid in the high pressure lubrication circuit at the first lubrication fluid pressure.

A reciprocating pump with a dual circuit lubrication system, comprising:

• a fluid end coupled to a power end, the fluid end configured to supply fluid at a high pressure into a wellbore;
• a first lubrication pump of a high pressure lubrication circuit supplying a lubrication fluid to the power end;
• a second lubrication pump of a low pressure lubrication circuit supplying lubrication fluid to the power end, a first lubrication fluid pressure of the high pressure lubrication circuit being higher than a second lubrication fluid pressure of the low pressure lubrication circuit, the first and second lubrication pumps operating in parallel;
• and
• at least one check valve allowing recirculation of the lubrication fluid at the second lubrication fluid pressure in the low pressure lubrication circuit and the high pressure lubrication circuit while the reciprocating pump is in neutral, and allowing recirculation of the lubrication fluid at the second lubrication fluid pressure in the low pressure lubrication circuit and recirculation of the lubrication fluid at the first lubrication fluid pressure in the high pressure lubrication circuit when the reciprocating pump is pumping.