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Probe Tester

The purpose of the gas lift valve probe tester is to determine the relative "stiffness" of a gas lift valve and to determine the maximum available travel of the stem top. When gas pressure is admitted to the tester, it acts on the full area of the valve bellows to lift the stem off the seat. When this pressure increased, the stem tip lifts further off the seat. By using the valve probe tester, an accurate measure of the stem tip travel, per pressure increase, can be determined and the results tabulated and plotted. When the pressure is plotted as the ordinate and the stem tip travel as the abscissa, a relatively straight line will be generated for the majority of the stem tip travel. The slope of this line is an indication of the "stiffness" of the valve. The numerical value of the slope is called the bellows assembly load rate (blr) and is measured in psiginch [kpamm]. In this context, the "bellows assembly" includes the bellows and the system which applies a load to hold the valve stem on the seat.

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