Monitoring of check valves.

摘要

A method and apparatus for nonintrusive monitoring of a check valve (20) provide an accelerometer (24) and an ultrasonic transducer (32) mounted on the check valve body (28). The accelerometer (24) and transducer (32) generate signals corresponding to audible sounds within the check valve (20) and reflected ultrasonic signals transmitted into the check valve (20) by the transducer (32). The signals are simultaneously recorded and then processed to provide a visual representation of conditions within the check valve (20).