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A human-powered pump assembly includes a frame and a treadle pivot attached to the frame, such that the treadle pivot defines a horizontal rotational axis. The pump assembly includes a pair of treadles coupled to the treadle pivot and a rocker pivot attached to the frame, such that the rocker pivot

A human-powered pump assembly includes a frame and a treadle pivot attached to the frame, such that the treadle pivot defines a horizontal rotational axis. The pump assembly includes a pair of treadles coupled to the treadle pivot and a rocker pivot attached to the frame, such that the rocker pivot defines a separate horizontal rotational axis. The pump assembly includes a reciprocating rocker coupled to the rocker pivot and to the pair of treadles to constrain the motion thereof, such that the rocker pivot axis is located below the treadle pivot axis.

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1. A human-powered pump assembly comprising: a frame;a treadle pivot attached to the frame, the treadle pivot defining a fixed horizontal rotational axis;a pair of treadles coupled to the treadle pivot;a rocker pivot attached to the frame, the rocker pivot defining a separate horizontal rotational a

1. A human-powered pump assembly comprising: a frame;a treadle pivot attached to the frame, the treadle pivot defining a fixed horizontal rotational axis;a pair of treadles coupled to the treadle pivot;a rocker pivot attached to the frame, the rocker pivot defining a separate horizontal rotational axis;a pair of cylinders coupled to the frame;a piston disposed in each of the cylinders, each piston comprising a connecting rod forming a channel along a longitudinal axis of the connecting rod; anda reciprocating rocker coupled to the rocker pivot and to the pair of treadles to constrain the motion thereof, wherein the rocker pivot axis is located below the treadle pivot axis throughout a full range of motion of the assembly. 2. The pump assembly of claim 1, wherein the rocker pivot is supported by the frame on two sides of the reciprocating rocker. 3. The pump assembly of claim 1, wherein the cylinders are welded to the frame. 4. The pump assembly of claim 1, wherein each channel is configured to receive an edge of the reciprocating rocker to guide movement of an associated piston. 5. The pump assembly of claim 4, wherein each edge of the reciprocating rocker and an associated channel are configured for rolling contact to maintain piston alignment in an associated cylinder. 6. The pump assembly of claim 1, wherein the pistons are connected by tensile members to the reciprocating rocker. 7. The pump assembly of claim 6, wherein the tensile members are located between the pair of treadles. 8. The pump assembly of claim 6, wherein each of the tensile members is a flexible steel cable. 9. The pump assembly of claim 1 further comprising a pair of valves disposed within each cylinder. 10. The pump assembly of claim 9 further comprising a valve plate connected to each cylinder. 11. The pump assembly of claim 10, wherein each valve plate forms a pair of shaped apertures. 12. The pump assembly of claim 11, wherein the pair of valves are adapted to seal the pair of shaped apertures and are configured to be installed in the valve plate via access to solely one side of the valve plate. 13. The pump assembly of claim 12, wherein the shaped aperture comprises a substantially triangular portion. 14. The pump assembly of claim 9, wherein each valve comprises a compound seal with a replaceable hinge reinforcement element adapted to modify an opening force of the valve and to bias the valve into sealing engagement with a valve plate. 15. The pump assembly of claim 14, wherein the replaceable hinge reinforcement element comprises an elongate element. 16. The pump assembly of claim 14, wherein the replaceable hinge reinforcement element comprises a tubular element. 17. A method of operating a human-powered pump assembly, the method comprising the steps of: applying a downward force to a first treadle to rotate the first treadle about a horizontally fixed treadle pivot axis in a downward direction, thereby pushing down a first piston within a first cylinder coupled to a frame, the first treadle coupled to a second treadle by a reciprocating rocker rotating about a rocker pivot axis located below the treadle pivot axis throughout a full range of motion of the assembly, such that the second treadle rotates in an upward direction, thereby pulling up a second piston within a second cylinder coupled to the frame; andapplying a downward force to the second treadle to rotate the second treadle about the treadle pivot axis in a downward direction, such that the first treadle rotates in an upward direction, whereby the first and second pistons move in the direction of the first and second treadles, respectively,wherein each piston comprises a connecting rod forming a channel along a longitudinal axis of the connecting rod. 18. The method of claim 17, wherein the first piston transfers a downward force through a first tensile member to the reciprocating rocker, causing the reciprocating rocker to rotate about the rocker pivot axis. 19. The method of claim 17, wherein each treadle is received in a cradle in a corresponding piston and is raised by upward movement of the corresponding piston.