METHOD AND APPARATUS FOR MEASURING EXPANSION VALVE DIAPHRAGM STROKE

摘要

An expansion valve assembly includes a housing that defines a passage through which a fluid flows. The assembly also includes a diaphragm that deflects according to a characteristic of the fluid and valve member that is operably coupled to the diaphragm to move within the passage between a first position and a second position due to deflection of the diaphragm to regulate flow of the fluid through the passage. A stroke is defined by a distance between the first and second positions of the valve member. Moreover, the assembly includes a stroke measuring device having a first member and a second member. The first member is operably coupled to the valve member to move relative to the second member due to movement of the valve member. The stroke measuring device is operable to detect the amount of relative movement of the first and second members to detect the stroke.