| 摘要 |
A valve apparatus used in heating and cooling systems in which a valve housing, a valve element, a drive mechanism, and a torque limiting mechanism operate to open and close the valve element between different ports to allow fluid flow through the flow passage within the valve. A torque limiting mechanism comprising a spring limits the amount of torque required by the motor by using energy stored in the spring to assist in maintaining the valve element in a closed position, or to maintain the valve element in an intermediate position for the regulation of flow through the valve flow passage in both mixing and diverting applications. The valve mechanism includes a motor driven mechanism with a de-energizing circuit to stop the rotation of the motor upon the motor driven mechanism applying a predetermined amount of compression to the spring. The compressed spring exerting a substantially equal force to the valve element for closing the different ports.
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