TheALP series gear pumps are available as single rotation and bi-rotational. 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". ALP...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 leftALP...S therefore with left "S" rotation when looking at it from the same angle.. Direction of Rotation 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. V = displacement [cm³/rotation] Dp = pressure differential [bar] M= (V •Dp) / (62.8 • hhm) [Nm] Absorbed torque Calculate necessary torque (M) of a pump subject to pressure differential between inlet and delivery as follows: hhm= hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions). hvol = pump volumetric efficiency (take 0.95 as an indicative value for rotation speeds ranging between 1000 and 2000 rotations per minute) Drive 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. For further details contact jbj Techniques technical office, email: info@jbj.co.uk or telephone: +44 (0)1737 767493 In case of driving through gears, pulleys or chains, the T option is recommended. This option allow radial and/or axial loads on the pump shaft. Frequently Used Formulas Fluid velocity v =Q / 6 •A[m/s] Q= flow rate [litre/min] A= inside area of pipe [cm²] Absorbed flow rate Calculate the velocity (v) of a fluid in a pipe as follows: Q= V • n • 10 -3 / hvol [litre/min] V = displacement [cm³/rotation] n = rotation speed [rotations per minute] Calculate flow rate (Q) as follows: Gear Pumps ALP Series Installation and Running Information 11 www.jbj.co.uk/gear-pumps.html #DriveLineHarmony
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