A valve for gradient 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, a second rotor slot, and a third rotor slot; wherein the valve is operable among a first position, a second position, and a third position; the first position comprising: the first stator orifice in communication with the first rotor slot, and the second stator orifice in communication with the third stator orifice via the second rotor slot, and the fourth stator orifice in communication with the fifth stator orifice via the third rotor slot; the second position comprising: the first stator orifice in communication with the third stator orifice via the first rotor slot, and the second stator orifice in communication with the second rotor slot, the fourth stator orifice in communication with the third rotor slot, and the fifth stator orifice in isolation; the third position comprising the first stator orifice in communication with the third stator orifice and the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, the second rotor slot in isolation, the fourth stator orifice in isolation, and the third rotor slot 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, a second rotor slot, and a third rotor slot; wherein the valve is operable among a first position, a second position, and a third position; the first position comprising: the first stator orifice in communication with the first rotor slot, and the second stator orifice in communication with the third stator orifice via the second rotor slot, and the fourth stator orifice in communication with the fifth stator orifice via the third rotor slot; the second position comprising: the first stator orifice in communication with the third stator orifice via the first rotor slot, and the second stator orifice in communication with the second rotor slot, the fourth stator orifice in communication with the third rotor slot, and the fifth stator orifice in isolation; the third position comprising the first stator orifice in communication with the third stator orifice and the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, the second rotor slot in isolation, the fourth stator orifice in isolation, and the third rotor slot in isolation. the first stator orifice in communication with the first rotor slot, and the second stator orifice in communication with the third stator orifice via the second rotor slot, and the fourth stator orifice in communication with the fifth stator orifice via the third rotor slot; the second position comprising: the first stator orifice in communication with the third stator orifice via the first rotor slot, and the second stator orifice in communication with the second rotor slot, the fourth stator orifice in communication with the third rotor slot, and the fifth stator orifice in isolation; the third position comprising the first stator orifice in communication with the third stator orifice and the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, the second rotor slot in isolation, the fourth stator orifice in isolation, and the third rotor slot in isolation. the first stator orifice in communication with the third stator orifice via the first rotor slot, and the second stator orifice in communication with the second rotor slot, the fourth stator orifice in communication with the third rotor slot, and the fifth stator orifice in isolation; the third position comprising the first stator orifice in communication with the third stator orifice and the fifth stator orifice via the first rotor slot, the second stator orifice in isolation, the second rotor slot in isolation, the fourth stator orifice in isolation, and the third rotor slot in isolation.