Expandable, inner liner pump

A pump system, comprising:

• a primary pump that pumps a primary fluid, the primary pump comprising a first pump unit comprising:
• a first inner liner that is expandable, an interior of which defines a first primary fluid chamber, the first primary fluid chamber comprising an inlet and an outlet;
• and
• a first outer liner disposed around the first inner liner, an interior of the first outer liner defining at least a portion of a first secondary fluid chamber;
• a secondary pump that pumps a secondary fluid, the secondary pump in fluid communication with the first secondary fluid chamber to operably pump the secondary fluid into and out of the first secondary fluid chamber, resulting in the compression and expansion of the first inner liner;
• a first valve disposed proximate the inlet of the first primary fluid chamber, and a second valve disposed proximate the outlet of the first primary fluid chamber, wherein the first and second valves, in combination, are configured to merely allow fluid flow in one direction through the first primary fluid chamber;
• a secondary fluid sump in fluid communication with the secondary pump and the first secondary fluid chamber to receive secondary fluid from the first secondary fluid chamber, the secondary fluid sump containing the secondary fluid used by the secondary pump;
• and
• a third valve and a fourth valve respectively disposed in the secondary fluid contained by the secondary fluid sump and respectively disposed below a secondary fluid level in the secondary fluid sump, the third and fourth valves each being one-way valves. the third valve fluidly coupled with the first secondary fluid chamber and the secondary fluid sump to allow the secondary fluid to enter the secondary fluid sump, and the fourth valve fluidly coupled with the secondary fluid sump and other portions of the secondary pump to allow the secondary fluid to be drawn out of the secondary fluid sump.

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;
• an outer liner disposed around the inner liner, an interior of the outer liner defining at least a portion of a secondary fluid chamber, the secondary fluid chamber comprising a first fluid port and a second fluid port;
• and
• a first valve disposed proximate the primary fluid chamber inlet, and a second valve disposed proximate the primary fluid chamber outlet, wherein the first and second valves, in combination, are configured to merely allow fluid flow in one direction through the primary fluid chamber;
• a secondary pump that pumps a secondary fluid in a cyclical flow path, 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 the respective secondary fluid chambers via the first fluid port and out of the respective secondary fluid chambers via the second fluid port, resulting in the compression and expansion of the respective inner liners of the first and second pump units;
• and
• a secondary fluid sump in fluid communication with the secondary pump and in fluid communication with the respective secondary fluid chamber to receive secondary fluid from the respective secondary fluid chamber, and the secondary fluid sump operably providing secondary fluid to the secondary pump;
• wherein the first pump unit and second pump unit operably pump in a synchronous and phased operation with respect to each other.