Abstract
As a result of the initial experience obtained with a valve-loading simulator of this type it is concluded that the inversion principle of cycling the valve rather than the fluid is entirely feasible and practical in the frequency range of 30 cps. Peak pressures and flows can be controlled by adjusting the driving eccentricity or the tube configuration. The device is relatively inexpensive, involves no precision parts in its construction, and is capable of simultaneously subjecting a considerable number of test valves to cyclic pressures. It has been possible to use the central transverse strut of the center-hinged valves as a convenient sensing point, which, in conjunction with wire resistance strain gauges has provided a simple and effective pressure-sensing system. In other types of valves such an obvious sensing location may not be available. If not, a somewhat different system may be required for pressure instrumentation.
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