Expandable, inner liner pump

A replaceable pump component comprising:

• a flexible membrane having inner surfaces defining a first primary fluid chamber and a second primary fluid chamber, wherein the first and second primary fluid chambers are separated are fluidly isolated from one another;
• a first inlet valve coupled to the first primary fluid chamber;
• a first outlet valve coupled to the first primary fluid chamber;
• a second inlet valve coupled to the second primary fluid chamber;
• and
• a second outlet valve coupled to the second primary fluid chamber.

A pump system, comprising:

• a primary pump that pumps a primary fluid, the primary pump comprising a first pump unit and a second pump unit, respective pump units comprising:
• an inner liner that is expandable, an interior of which defines a primary fluid chamber, the primary fluid chamber comprising an inlet and an outlet;
• and
• an outer liner disposed around the inner liner, an interior of the outer liner defining at least a portion of a secondary fluid chamber;
• and
• a secondary pump that pumps a secondary fluid, the secondary pump comprising a dual chamber piston pump that is in fluid communication with the respective secondary fluid chambers of the first and second pump units to operably pump the secondary fluid into and out of the respective secondary fluid chambers, resulting in the compression and expansion of the respective inner liners of the first and second pump units;
• wherein the first pump unit and second pump unit operably pump in a synchronous and phased operation with respect to each other,
• wherein the dual chamber piston pump comprises:
• a first piston chamber;
• a second piston chamber;
• a first piston movably coupled to the first piston chamber;
• a second piston movably coupled to the second piston chamber;
• a first pressure sensor coupled to the first piston chamber and configured to measure a of the secondary fluid in the first piston chamber;
• and
• a second pressure sensor coupled to the second piston chamber and configured to measure a pressure of the secondary fluid in the second piston chamber,
• wherein the secondary pump is configured to conduct a premotion pressure equalization step to reduce a difference between the pressure of the secondary fluid in the first piston chamber and the pressure of the secondary fluid in the second piston chamber before one of the first or second pistons begins pushing secondary fluid out of their respective piston chamber.