Pulseless positive displacement pump and method of pulselessly displacing fluid

A pump comprising:

• a process fluid flowpath comprising:
• an inlet manifold;
• an outlet manifold;
• a first fluid cavity disposed between the inlet manifold and the outlet manifold;
• a second fluid cavity disposed between the inlet manifold and the outlet manifold;
• a first inlet check valve disposed between the first fluid cavity and the inlet manifold and a second inlet check valve disposed between the second fluid cavity and the inlet manifold;
• and
• a first outlet check valve disposed between the first fluid cavity and the outlet manifold and a second outlet check valve disposed between the second fluid cavity and the outlet manifold;
• an internal pressure chamber extending between and bounded by a first fluid displacement member and a second fluid displacement member, wherein the first fluid displacement member is disposed between the internal pressure chamber and the first fluid cavity, and wherein the second fluid displacement chamber is disposed between the internal pressure chamber and the second fluid cavity;
• a drive extending into the internal pressure chamber;
• a hub disposed within the internal pressure chamber and mounted on the drive;
• a first attachment portion on the hub;
• a second attachment portion on the hub;
• a first flexible belt extending between and connecting the first attachment portion and the first fluid displacement member;
• and
• a second flexible belt extending between and connecting the second attachment portion and the second fluid displacement member;
• wherein the first flexible belt is configured to transmit tensile forces to the first fluid displacement member but is incapable of transmitting compressive forces to the first fluid displacement member, and wherein the second flexible belt is configured to transmit tensile forces to the second fluid displacement member but is incapable of transmitting compressive forces to the second fluid displacement member;
• and
• wherein the internal pressure chamber is configured to be filled with a working fluid, the working fluid configured to drive the first fluid displacement member into the first fluid chamber and to drive the second fluid displacement member into the second fluid chamber.