Direction of Rotation The GHP series gear pumps are available as single directional and bi-directional. The direction of rotation is defined in the following way: looking at the front of the pump with the driver shaft positioned upward and sticking toward the observer, it will be a mono-directional right "D". GHP...D pump therefore with right. "D" rotation, if its rotation will be clockwise and therefore the inlet port will be on the left while the outlet port will be on the right. Vice-versa it will be a monodirectional left GHP...S therefore with left "S" rotation when looking at it from the same angle.. S = counter-clockwise rotation INPUT OUTPUT D = clockwise rotation INPUT OUTPUT R = reversible rotation The bi-directional GHP series pumps, "R" have both functional characteristics of the mono-directional motors with clockwise and counterclockwise rotation. Connect the pump to the motor using a mechanical power transmission coupling so that no radial and/or axial force is transmitted to the pump shaft during rotation, otherwise pump efficiency will dramatically drop due to early wear of inner moving parts. jbj Techniques have a wide range of suitable couplings to suit a wide range of applications and we can advise on which coupling depending on the circumstances of the application. Calculate the velocity (v) of a fluid in a pipe as follows: v =Q / 6 •A[m/s] Frequently Used Formulas Drive For further details contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 In case of axial and/or radial loads on themotor’s shaft T option is available for some GHP2models and RAoption is available for some GHP1 types. Fluid velocity A= inside area of pipe [cm²] Absorbed flow rate V = displacement [cm³/rotation] hvol = pump volumetric efficiency (take 0.95 as an indicative value for rotation speeds ranging between 1000 and 2000 rotations per minute) Calculate flow rate (Q) as follows: Absorbed torque Q= flow rate [litre/min] Q= V • n • 10 -3 / hvol [litre/min] n = rotation speed [rotations per minute] Calculate necessary torque (M) of a pump subject to pressure differential between inlet and delivery as follows: V = displacement [cm³/rotation] M= (V •Dp) / (62.8 • hhm) [Nm] Dp = pressure differential [bar] hhm= hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions). Gear Pumps GHP Series Installation and Running Information 11 www.jbj.co.uk/gear-pumps.html #DriveLineHarmony
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