JUNE-JULY 2018 Nov-Dec 2017 - Copy - Page 81

BOOK IN SERIES ∆  =     Units of the valve coefficient is [(units of flow rate)/(units of pressure) -0.5 ] .  Hydraulic Nonlinear Resistances in Series: Figure 1.10 shows three hydraulic valves in series. Equations 1.10A, 1.10B and 1.10C show how to calculate the Equivalent Valve Coefficient for valves in series C ves . The calculation is based on the following two facts:  The flow through the valves in series is the same.  The total differential pressure equals the sum of the differential pressures across each valve in series.    ∆  = ∆  + ∆  + ∆  =   .    +  +         =    = ∆       +  +   ×         ∆  =      ∑  .  .  .      81 www.ghmediabusiness.com Fig. 1.10 - Nonlinear Hydraulic Resistances in Series