A pump includes a housing partially bounded by first and second outer walls, an inner wall fixed within a bore, a first piston disposed between the first outer wall and the inner wall, a second piston disposed between the second outer wall and the inner wall, a coupling member coupling the first and second pistons, a plurality of valves, and a control unit configured to communicate with the plurality of valves. Wherein One of a first inner chamber and a first outer chamber is configured to receive process fluid and the other of the first inner chamber and the first outer chamber is configured to receive working fluid, and one of a second inner chamber and a second outer chamber is configured to receive damping fluid and the other of the second inner chamber and the second outer chamber is configured to receive working fluid.