Check valve testing method.

摘要

Direct non-intrusive method of testing the operating condition and characteristics of a fluid flow check valve by mounting a sensor (50,60) inside the valve body (10). One form of sensor (50) is a proximity probe threaded in a drilled and tapped hole (50a) in the body wall which uses impedance variations which are caused by eddy currents induced in the conductive pivoted arm 24's non-symmetrical end (24a) directly adjacent probe (50). Another directly reading sensor embodiment is a strain gage shear pin (60) for pivoting arm (24). Directly sensed electrical signals represent displacement or strain magnitude changes at the hinge arm end for diagnostic use. Recording of valve signatures and comparison of later readings are used to determine and analyze degradation wear in the valve.