Equal percentage calculation
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This document discusses the relationship between valve opening percentage and flow for an equal percentage valve. It provides the formula Q = Q0 * e^bY, where Q is the flow, Q0 is the initial flow, Y is the valve opening percentage, and b is a constant determined by the maximum flow. The document then applies this formula using sample values and graphs the resulting flow at each 10% valve opening from 10-100%.
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Equal percentage calculation
- 1. Equal percentage of valve & opening VS flow Prem Baboo Sr. Manager (Prod) National Fertilizers Ltd. India F.I.E., Institution of Engineers (India) Technical Advisor & an Expert for www.ureaknowhow.com
- 2. Formula is Q = Q0 eby For Typical values of Q0 1000 Qmax = 30000 Substituting these values in the above equation we can get 30000 = 1000 X eb x1 e b x 1 = 30 there fore b= ln (30) b= 3.4011974
- 3. Stroke% y value Flow to %y Flow in kg/hr 10 0.1 Q10 1404.94759 20 0.2 Q20 1973.87773 30 0.3 Q30 2773.19476 40 0.4 Q40 3896.1933 50 0.5 Q50 5473.94739 60 0.6 Q60 7690.6092 70 0.7 Q70 10804.9029 80 0.8 Q80 15180.3222 90 0.9 Q90 21327.5572 100 1 Q100 29964.1
- 4. 1,405 1,974 2,773 3,896 5,474 7,691 10,805 15,180 21,328 29,964 0 5000 10000 15000 20000 25000 30000 35000 1 3 5 7 9 Flowkg/hr Stroke%/10