Patent ID: 7823468

Claim:
A sample injection valve for preparatory liquid chromatography comprising: at least one rotor; actuator means for moving the at least one rotor from position to position; a plurality of output ports; each of said output ports being alignable with a corresponding opening in said at least one rotor; said at least one rotor having a straight smooth passageway through its center whereby ports spaced 180 degrees from each other may communicate when the at least one rotor is in a first position; said at least one rotor having a connecting channel having a first channel end and a second channel end; the first channel end of said connecting channel communicating with a third port and the second channel end communicating with a fourth port; said third and fourth ports being between a first port and a second port whereby said at least one rotor rotates from position to position, said ports spaced 180 degrees from each other communicate with each other and adjacent ports communicate with each other; wherein said first port is adapted to communicate through a sample holder with a source of chromatographic solvent and said second port is adapted to communicate with a chromatographic column through a passageway that extends from said sample holder to said chromatographic column; said passageway being a smooth passageway.