A valve for continuous flow for high performance liquid chromatography comprising: a stator and a rotor having a common center axis, the stator having a first stator orifice, a second stator orifice, a third stator orifice, a fourth stator orifice, and a fifth stator orifice; the rotor having a first rotor slot and a second rotor slot; wherein the valve is operable among a first position, a second position, a third position, a fourth position, a fifth position, a sixth position, a seventh position, and an eighth position; the first position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, and the fourth stator orifice in communication with the fifth stator orifice via the second rotor slot; the second position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, the fourth stator orifice in communication with the second rotor slot, and the fifth stator orifice in isolation; the third position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in communication with the fourth stator orifice via the second rotor slot, and the fifth stator orifice in isolation; the fourth position comprising: the first stator orifice in communication with the first rotor slot, the second stator orifice in isolation, the third stator orifice in communication with the fourth stator orifice via the second rotor slot and the fifth stator orifice in isolation; the fifth position comprising: the first stator orifice in communication with the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, and the third stator orifice in communication with the fourth stator orifice via the second rotor slot; the sixth position comprising: the first stator orifice in communication with the the first rotor slot, the second stator orifice in isolation, the third stator orifice in communication with the fourth stator orifice via the second rotor slot, and the fifth stator orifice in isolation; the seventh position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in communication with the fourth stator orifice via the second rotor slot; and the eighth position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, the fourth stator orifice in communication with the second rotor slot and the fifth stator orifice in isolation. a stator and a rotor having a common center axis, the stator having a first stator orifice, a second stator orifice, a third stator orifice, a fourth stator orifice, and a fifth stator orifice; the rotor having a first rotor slot and a second rotor slot; wherein the valve is operable among a first position, a second position, a third position, a fourth position, a fifth position, a sixth position, a seventh position, and an eighth position; the first position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, and the fourth stator orifice in communication with the fifth stator orifice via the second rotor slot; the second position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, the fourth stator orifice in communication with the second rotor slot, and the fifth stator orifice in isolation; the third position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in communication with the fourth stator orifice via the second rotor slot, and the fifth stator orifice in isolation; the fourth position comprising: the first stator orifice in communication with the first rotor slot, the second stator orifice in isolation, the third stator orifice in communication with the fourth stator orifice via the second rotor slot and the fifth stator orifice in isolation; the fifth position comprising: the first stator orifice in communication with the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, and the third stator orifice in communication with the fourth stator orifice via the second rotor slot; the sixth position comprising: the first stator orifice in communication with the the first rotor slot, the second stator orifice in isolation, the third stator orifice in communication with the fourth stator orifice via the second rotor slot, and the fifth stator orifice in isolation; the seventh position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in communication with the fourth stator orifice via the second rotor slot; and the eighth position comprising: the first stator orifice in communication with the second stator orifice via the first rotor slot, the third stator orifice in isolation, the fourth stator orifice in communication with the second rotor slot and the fifth stator orifice in isolation.