Patent ID: 8292839

Claim:
A delivery system for alternating the source to a pump either from external fluid sources or from an internal recirculation loop, the system comprising: a first supply port and a second supply port which are connected through flexible tubes to two independent external fluid sources; a third port and a fourth ports connected to two separate pump tubes; a fifth port connected to a recirculation tube a sixth port vented to atmospheric pressure; and a manifold containing a first channel, a second channel and a third channel, wherein the manifold is rotatable between at least a first manifold switch position and a second manifold position; wherein rotating the manifold into the first manifold switch position orients the first channel to provide fluid communication between the first supply port and the third port leading to the pump and orients the second channel to provide fluid communication between the second fluid port and the fourth pump port, wherein the third channel is only in fluid communication with the fifth recirculation port; wherein rotating the manifold into the second manifold switch position orients the first and the second channels to occlude flow and positions the third channel to provide fluid communication between the fifth port and the third port and the fourth port leading to the pump.