Patent ID: 8708852
Filing Date: 2014-04-29
Classification: F16K

Abstract:
1. A vertical spring return valve actuator comprising: a body; a motor disposed inside the body; a first worm gear having a first worm formed on a drive shaft of the motor and a first worm wheel adapted to be engaged with the first worm; a second worm gear having a second worm extending from a shaft of the first worm wheel and a second worm wheel adapted to be engaged with the second worm; a planetary gear unit having a sun gear fixed to a shaft of the second worm wheel, planetary gears adapted to be engaged with the sun gear to roll around the sun gear, and a ring gear adapted to be engaged with the planetary gears to travel around the planetary gears; a planetary gear support unit having a planetary gear carrier adapted to support the planetary gears and an output shaft formed on a lower part of the planetary gear carrier wherein the planetary gear carrier rotates with the planetary gears; a brake unit disposed on an outer surface of the ring gear and having a brake function; a spring return unit having a spring shaft coupled to the output shaft, a spiral spring disposed around the spring shaft, and a stopping means for preventing unwinding of the spiral spring at a breakout state; and a valve manual opening and closing unit having an eccentric member adapted to be rotated by means of a lever, a variable worm adapted to be rotatable around one end of the eccentric member in such a manner as to be coupled to or separated from a portion of an outer periphery of the ring gear depending on an operation of the eccentric member, and a steering wheel hinge-coupled to an end of the variable worm opposite to the eccentric member.