| 摘要 |
An electric valve system includes an electric valve actuator and a valve. A sensor for measuring torque or thrust is mounted on a rotatable component of the actuator or the valve, such as the valve stem, worm shaft, motor drive shaft, drive sleeve, handwheel adaptor, teeth of worm gear, declutch mechanism, declutch handle or input shaft of an encoder. The sensor may be a SAW sensor 100 or strain gauges. Alternatively the sensor may be a pair of optical sensors placed in line on the rotatable component relative to the rotational axis of the component. The output of the sensor is wirelessly transmitted, e.g. by radio frequency in the case of SAW sensors. The outputs of SAW sensors may be uniquely identifiable so that torque data may be uniquely associated with a particular valve actuator and/or locations within a valve actuator. |
