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. ∆ = ∆ + ∆ + ∆ = . + + = = ∆ + + × ∆ = ∑ . . . 87 www.ghmediabusiness.com Fig. 1.10 - Nonlinear Hydraulic Resistances in Series