Patent ID: 7625190

Claim:
A valve configured to provide continuous flow of a fluid comprising: an inflow port configured to permit fluid to flow into the valve from a fluid source that is in fluid communication with the inflow port; an outflow port configured to discharge fluid from the valve; a first port configured to be in fluid communication with a first portion of a dual acting pump; a second port configured to be in fluid communication with a second portion of the dual acting pump; an internal conduit comprising a first and second passage, the internal conduit configured to provide fluid communication between the inflow port, the outflow port, the first port, and the second port; first and second occluders configured to each have respectively, first and second seated positions within the internal conduit and to thereby control the fluid communication within the internal conduit, the first occluder configured to allow fluid communication between the inflow port and either the first port or the second port depending on its seated position and the second occluder configured to allow fluid communication between the outflow port and either the first port or the second port depending on its seated position; and first and second independently translatable rods, the first rod configured to linearly translate the first occluder between the first and second positions within the first passage, and the second rod configured to linearly translate the second occluder between the first and second positions within the second passage, said first passage having a first passage wall extending between said first and second seated positions of the first occluder, and said second passage having a second passage wall extending between the first and second seated positions of the second occluder, wherein as the first occluder moves within the first passage between the first and second seated positions there is a space between the first occluder and the first passage wall, and as the second occluder moves within the second passage between the first and second seated positions there is a space between the second occluder and the second passage wall; wherein the valve is configured such that when the first and second occluders are in the first seated positions, the inflow port is in fluid communication with the first portion of the dual acting pump and the outflow port is in fluid communication with the second portion of the dual acting pump, and when the first and second occluders are in the second seated positions, the inflow port is in fluid communication with the second portion of the dual acting pump and the outflow port is in fluid communication with the first portion of the dual acting pump.