Bachelor of science degree in engineering: Inherent Command Valve Period Of Time Characteristics

The almost mutual characteristics are shown inwards the figure below. The percent of menses through the valve is plotted against valve stalk position. The curves shown are typical of those available from valve manufacturers. These curves are based on constant pressure level drib across the valve in addition to are called inherent menses characteristics.
  • Linear - menses capacity increases linearly alongside valve travel.
  • Equal percentage - menses capacity increases exponentially alongside valve trim down travel. Equal increments of valve move gain equal per centum changes inwards the existing Cv.
  • A modified parabolic characteristic is some midway betwixt linear in addition to equal-percentage characteristics. It provides fine throttling at depression menses capacity in addition to some linear characteristics at higher menses capacity.
  • Quick opening provides large changes inwards menses for really small-scale changes inwards lift. It commonly has also high a valve gain for purpose inwards modulating control. So it is express to on-off service, such equally sequential performance inwards either batch or semi-continuous processes.
  • Hyperbolic
  • Square Root
  •  

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