MOTOR OPERATED VALVE ANALYSIS AND TESTING SYSTEM WITH MONITORING OF SPRING PACK MOVEMENT THROUGH TORQUE SWITCH POST

摘要

A unique device and method are used to detect and measure movement of a valve spring pack (7) and worm (3) through monitoring rotation of the torque switch control post (54). A device for measuring the operating characteristics of a valve (15) and its operator (18) and the corresponding imposed valve stem load is attached to the valve operator. The device includes a stem load calibration device (17) for statically calibrating the operator relative to the imposed valve load and provides a recorder for recording traces of the imposed load and associated parameters during dynamic conditions as related to the operation of the operator and valve combined. The device provides initial dynamic traces after initial assembly, maintenance and/or periodic testing of the operator and valve. The device is then used to provide diagnostic dynamic traces at any specified time in the future for the operator and valve. These future traces are used to compare with earlier traces to verify correct performance and most importantly to detect induced or impending damage, malfunctions, or maintenance requirements for the operator and valve.