초록 ▼

A Valve Analysis and Testing System includes various devices for measuring the operating characteristics of a valve and its operator and the corresponding imposed valve stem load, which devices are attached to the valve operator. These devices provide for statically calibrating the operator relative

A Valve Analysis and Testing System includes various devices for measuring the operating characteristics of a valve and its operator and the corresponding imposed valve stem load, which devices are attached to the valve operator. These devices provide for statically calibrating the operator relative to the imposed valve load and provide recording traces of the imposed load and associated parameters during dynamic conditions as related to the operation of the operator and valve combined. The System provides initial dynamic traces after initial assembly, maintenance and/or periodic testing of the operator and valve. The System is then used to provide diagnostic dynamic traces at any specified time in the future for the operator and valve. These further 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.

대표청구항 ▼

A spring pack movement monitoring device for monitoring the movement of the spring pack found within a valve operator, wherein the valve operator includes a driven worm shaft, which in turn drives a worm, which in turn drives a worm gear which in turn drives a valve stem to open and close a valve at

A spring pack movement monitoring device for monitoring the movement of the spring pack found within a valve operator, wherein the valve operator includes a driven worm shaft, which in turn drives a worm, which in turn drives a worm gear which in turn drives a valve stem to open and close a valve attached to the valve stem, and a spring pack provided at one end of the worm shaft for compression by the worm, said spring pack movement monitoring device comprising: a spring pack engagement member for making contact with the spring pack; tension means for maintaining said spring pack engagement member in constant contact with the spring pack; said engagement member moving in direct response to movement of the spring pack; a linear velocity differential transducer in communication with said spring pack engagement member and comprising a core element movable relative to a bracket element, wherein movement of the spring pack results in a relative movement between said core element and bracket element; said linear velocity differential transducer further comprising means for detecting the relative movement between said core element and bracket element; and means for recording the detected movement between said core element and bracket element.