METHOD AND APPARATUS FOR MEASURING VALVE STEM LOADS IN A MOTOR OPERATED VALVE ASSEMBLY

摘要

An in-series load bearing sensor is provided for use with a motor operated valve assembly. The in-series load bearing sensor is installed in the mechanical load path between the actuator and valve yoke to provide a direct measurement of valve stem thrust and/or actuator output torque under actual operating conditions. Sensor is precalibrated and can be installed temporarily for testing purposes or permanently for ongoing monitoring of valve performance. Webs (40) have strain gauges (41, 42, 43) thereon which measure the valve stem torque and valve stem thrust at any given moment. Webs (40) link an inner load ring (30) and an outer load ring (20).