Fluid pumps, methods of manufacturing fluid pumps, and methods of pumping fluid

A method of manufacturing a fluid pump, comprising:

• dividing a first cavity in a pump body with a first flexible member to define a first subject fluid chamber and a first drive fluid chamber within the first cavity;
• dividing a second cavity in the pump body with a second flexible member to define a second subject fluid chamber and a second drive fluid chamber within the second cavity;
• connecting the first flexible member and the second flexible member with a drive shaft extending at least partially through the pump body;
• positioning a first shift valve within the pump body between the first flexible member and the second flexible member beside the drive shaft;
• positioning a second shift valve within the pump body between the first flexible member and the second flexible member beside the drive shaft and the first shift valve;
• configuring the first shift valve to move from a first position to a second position thereof responsive to a mechanical force when the drive shaft reaches an end of a stroke in a first direction, movement of the first shift valve from the first position to the second position thereof causing a pressure of the drive fluid to move the second shift valve from a second position to a first position thereof and switching delivery of the drive fluid from the second drive fluid chamber to the first drive fluid chamber;
• and
• configuring the second shift valve to move from the first position to the second position thereof responsive to a mechanical force when the drive shaft reaches an end of a stroke in a second direction, movement of the second shift valve from the first position to the second position thereof causing the pressure of the drive fluid to move the first shift valve from the second position thereof to the first position and switching delivery of the drive fluid from the first drive fluid chamber to the second drive fluid chamber.

A method of manufacturing a fluid pump, comprising:

• forming a modular-receiving cavity within a housing;
• forming a plurality of recesses within the housing;
• disposing an insert within the modular-receiving cavity;
• and
• disposing a drive shaft within the insert.

A method of pumping fluid, comprising:

• moving a drive shaft, a first flexible member attached to a first end of the drive shaft, and a second flexible member attached to an opposite, second end of the drive shaft in a first direction in a pump body to expel fluid from a first subject fluid chamber adjacent the first flexible member and draw fluid into a second subject fluid chamber adjacent the second flexible member;
• moving a first shift valve located within the pump body between the first flexible member and the second flexible member beside the drive shaft in response to movement of the second flexible member;
• moving the drive shaft, the first flexible member, and the second flexible member in a second direction opposite the first direction to expel fluid from the second subject fluid chamber and draw fluid into the first subject fluid chamber;
• and
• moving a second shift valve located within the pump body between the first flexible member and the second flexible member beside the drive shaft in response to movement of the first flexible member.