A valve comprising: a valve body having an interior portion and an exterior portion, the interior portion defining a cavity; a movable valve member (120, 920, 1020) movable between an open position and a closed position; an internal actuation member having a ferromagnetic portion comprising an impermanent magnet disposed in the cavity, the internal actuation member operatively coupled to the movable valve member such that movement of the internal actuation member actuates movement of the movable valve member between the open position and the closed position; an external actuator coupled to the exterior portion of the valve body, the external actuator comprising: a first magnetic pole section adjacent to the exterior portion of the valve body; a second magnetic pole section adjacent to the exterior portion of the valve body, wherein magnetic flux (202, 302, 502) flows from the first magnetic pole section through the ferromagnetic portion to the second magnetic pole section in a magnetic flux path through the interior portion of the valve to magnetize the impermanent magnet, the magnetic flux having a magnitude sufficient to cause movement of the internal actuation member in response to movement of the external actuator when it rotates around the valve body, and a ferromagnetic material completing a return flow path for the magnetic flux between the first magnetic pole section and the second magnetic pole section. a valve body having an interior portion and an exterior portion, the interior portion defining a cavity; a movable valve member (120, 920, 1020) movable between an open position and a closed position; an internal actuation member having a ferromagnetic portion comprising an impermanent magnet disposed in the cavity, the internal actuation member operatively coupled to the movable valve member such that movement of the internal actuation member actuates movement of the movable valve member between the open position and the closed position; an external actuator coupled to the exterior portion of the valve body, the external actuator comprising: a first magnetic pole section adjacent to the exterior portion of the valve body; a second magnetic pole section adjacent to the exterior portion of the valve body, wherein magnetic flux (202, 302, 502) flows from the first magnetic pole section through the ferromagnetic portion to the second magnetic pole section in a magnetic flux path through the interior portion of the valve to magnetize the impermanent magnet, the magnetic flux having a magnitude sufficient to cause movement of the internal actuation member in response to movement of the external actuator when it rotates around the valve body, and a ferromagnetic material completing a return flow path for the magnetic flux between the first magnetic pole section and the second magnetic pole section. a first magnetic pole section adjacent to the exterior portion of the valve body; a second magnetic pole section adjacent to the exterior portion of the valve body, wherein magnetic flux (202, 302, 502) flows from the first magnetic pole section through the ferromagnetic portion to the second magnetic pole section in a magnetic flux path through the interior portion of the valve to magnetize the impermanent magnet, the magnetic flux having a magnitude sufficient to cause movement of the internal actuation member in response to movement of the external actuator when it rotates around the valve body, and a ferromagnetic material completing a return flow path for the magnetic flux between the first magnetic pole section and the second magnetic pole section.