Valve with variable inherent characteristics

ABSTRACT

Pipe line valves have been studied extensively to determine their inherent performance characteristics. However; some researches introduced different internal design for such valves to achieve a variety of inherent characteristics. Consequently, this is an obsolete way to achieve the required characteristic. The present paper introduces a new valve concept that consists of two parallel portions of globe type valves with different characteristics. The integration between the two valve portions, makes it possible to have an inherent flow coefficient range instead one performance curve according to the opening of the two valve portions. Experimental investigation is herein performed while studying the two valve portions individually and operating together while considering the variation of upstream pressure, Reynolds number, and valve direction. The results put guidelines for valve installation and performance on the basis of throttling and cavitation avoidance. The present work may be the first step for the new concept of valve type used for engineering systems