Abstract
Start-stop torque is one of the key parameters of valve's capacity. In China, a torque spanner is used to measure the
small-bore torque, but the accuracy is not very high. In the large-bore situation, the previous method can not be used to
measure the torque, so the torque is determined by the design calculation result. Sometimes this result is far from the
practical one, and the difference will impact the apolegamy of the actuating device of a valve. Some other methods, such
as inductance type transducer valve torque sensor, strain gauge valve torque sensor, appeared. They both have the
advantage of high accuracy, but their automatic level is low and their measuring equipments are complex. In this paper, a
new style torque measuring device which is based on theory of mechanics of materials and measuring principle of strain
gauge is designed. The maximal torque is 2000Nm. The measuring device is easy for installation, accurate on results,
and is able to meet the actually online measuring demands.
