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Where: Q = Leakage rate past piston, in3/sec D2 = Piston diameter, in a = Gap between piston and cylinder, in Ap = Pressure differential across piston, psi V = Fluid viscosity, lbf-sec/in2 L = Piston length, in The gap between the piston and cylinder, a, as shown in Figure 9.1 is a dynamic term being a function of wear. a = (D{-D2) + h (9-10) Where: Dj = Cylinder diameter, in h = Depth of wear scar, in Figure 9.1 Typical Single Acting Actuator The wear scar depth, h, will be equal to the volume of material lost due to wear, V, divided by the contact surface area, A: V h = (9-11) A Actuators 9-9 Revision C

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