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US 2011/0049407 A1Published application
Valve Actuator Having Spring Return Power
AssigneeEunha Machinery Industrial Co., Ltd.
InventorSoon-won Park
Life of this patent
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Abstract
A spring return valve comprising a motor, a first worm member, a second planetary gear member, a second worm member, an elastic member, and a valve attached to said second worm wheel is provided. Since the first and the second planetary gear are installed between the first worm shaft and the second worm shaft and the elastic member is fitted onto the second worm shaft, the load applied on the output shaft can be reduced a lot, the opening and/or closing operation is very easy even if the elastic coefficient is small, thereby the reduction in size is possible.
Claims14
A spring return valve actuator comprises:
- a motor;
- a first worm member comprising a first shaft connected to said motor to transmit power and a first worm wheel connected vertically to said first worm shaft;
- a first planetary gear member attached to a brake member in connection with said first worm wheel;
- a second planetary gear member connected to said first planetary gear member and located on the opposite position of said brake member;
- a second worm member comprising a second worm shaft which is in shaft connection with said second planetary gear member and a second worm wheel which is gear-connected vertically to said second worm shaft;
- an elastic member attached onto a shaft extending from said second worm shaft to the opposite side of said second planetary gear member;
- and,
- a valve attached to said second worm wheel.
5 more elements
Dependencies are inferred from the claim text.