MAGNETICALLY COUPLED SAFETY VALVE WITH SATELLITE INNER MAGNETS

摘要

A safety valve can include multiple magnetic devices reciprocably disposed in respective longitudinally extending chambers, and a another magnetic device magnetically coupled to the first magnetic devices. The first magnetic devices may be circumferentially spaced apart and encircled by the second magnetic device. Another safety valve can include multiple longitudinally extending chambers and multiple magnetic devices. Each of the magnetic devices may be reciprocably disposed in a respective one of the chambers, and the magnetic devices may be attached to an operating member of the safety valve.