Actuator and zone valve

Details Actuator and zone valve Actuator and zone valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 31/04 (2006.01) F16K 5/06 (2006.01)

Patent

CA 2125259

An improved zone valve is provided in which a motor-driven actuator assembly rotates a ball valve through about a 90° rotation, between a first, normal position, and an opposite position, e.g., between closed and opened positions. The actuator assembly includes a torsional spring configured to be tightened as the ball valve is rotated by the motor from its normal position to the opposite position. When the motor is de-energized, the spring provides a restoring torque that is sufficient to overcome the resisting frictional torque of the ball valve and inertia and friction of the de-energized motor, causing the drive shaft to rotate counter to the direction of rotation of the motor, thereby returning the valve to its normal position. Preferably, the torsion spring is positioned so that, in the normal position, it is preloaded sufficiently to provide adequate restoring torque to overcome the frictional resistance of the valve. The motor is coupled to the valve stem so that electrical energization of the motor rotates the ball valve through about a 90° rotation, i.e., from its normal position to the opposite position.

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