ALP1 ALP2 ALP3 E1 E2 E1 E2 E4 E1 E2 E3 E4 12 12 15,5 15,5 21 22 22 22 22 G¹⁄ 12 ⁹⁄ -18 UNF 12.7 G1/4 12 ⁹⁄ -18 UNF 12.7 ⁷⁄ -20 UNF 11.5 G3/8 15 ³⁄ -16 UNF 14.3 G1/4 12 ⁹⁄ -18 UNF 12.7 TYPE DRAIN THREAD DEPTH (mm) A B 57 Gear Pumps Reversible Pumps ALP Series www.jbj.co.uk/gear-pumps.html The external draining is located on the cover and it must be connected always to the tank; connection pipes to the system tank should never be clogged or show reduced cross-section, otherwise pressure values might exceed 6 bar. The reversible pumps can handle pressurized inflow. Draining As described at the beginning of the single rotation pump section, also bi-rotational models are rotary positive-displacement pumps with external gears. Their operating concept is the same as single rotation pumps. What changes is that bi-rotational pumps can rotate both clockwise and counterclockwise thanks to their perfectly symmetrical machining on the internal components. The pressures P1, P2, p3 of the reversible pumps of the GHP series must be reduced of approx 15%with respect to the pressures indicated on the performing charts relevant to themono-directional pumps. Please contact jbj Techniques technical office, tel: +44 (0)1737 767493 or email: info@jbj.co.uk. if systemoperating conditions differ from the values indicated in the product tables. #DriveLineHarmony Pressure Relief Valve It is possible, for the pumps of the group 2, using a pressure relief valve integrated onto the cover (option "VM"). This in both internal ("E0") or external G3/8 ("E3") draining. The setting pressure should be specified between 20 and 280 bars.
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