METHOD FOR DETECTING AN OPERATING CONDITION ON A VALVE ASSEMBLY AND IMPLEMENTATION THEREOF

摘要

A method to detect cycling of components that result from use of a tight shut-off mode on a valve assembly. Embodiments of the method use operating data from the valve assembly. This operating data includes data that reflects a position for the closure member relative to the seat. This position often corresponds with a measured position of one or more components (e.g., the valve stem) on the valve assembly. In one embodiment, the method includes steps for comparing the measured position to a boundary criteria that defines one or more boundary values proximate, and often equal to, the threshold levels of the tight shut-off mode. The method can also includes steps for identifying patterns in the data that indicate that the closure member is cycling from its closed position to a second position due to tight shut-off mode.

主权项

1. A method for detecting cycling of a closure member relative to a seat on a valve assembly, said method comprising:
receiving an input with data in a pattern that reflects movement of the closure member; comparing the data to a boundary criteria, the boundary criteria defining a first boundary value and a second boundary value separated by a boundary interval, wherein each of the first boundary value and the second boundary value is proximate, but larger than, a value for a closed position at which the closure member is in contact with the seat; incrementing a cycle count each time the pattern changes from a first value to a second value that is separated from the first value by at least the boundary interval; and generating an output that reflects the cycle count.