3520VQ25A14-1AA20

The 3520VQ25A14-1AA20 pump belongs to the Vane Pumps series and is manufactured by Vickers. It is used in hydraulic automation systems to convert mechanical drive power into controlled fluid flow. At a shaft speed of 2500 r/min on the front section, it can move 173.1 L/min (45 USgpm), providing high flow for actuators that need rapid motion. The front displacement is 81.6 cm³ per revolution, so each rotation delivers a fixed volume that simplifies flow calculation for circuit designers. A maximum operating pressure of 210 bar (3000 psi) on the front side permits use in medium-pressure circuits without external intensifiers. When the drive speed is limited to 1200 r/min, the front section supplies a rated flow of 25 USgpm, giving predictable performance in machines that run at standard motor speeds. Clockwise shaft rotation matches common right-hand industrial drive trains, which helps with interchange in existing layouts. All ports use SAE 4-bolt flanges, allowing rigid pipe connections that resist loosening under vibration. The assembly weighs 34.0 kg (75 lb), so mounting structures must support that mass during service.

The rear pumping element complements the front section to create a tandem unit that feeds separate circuits. At the same 2500 r/min, the rear section delivers 105.8 L/min (27.5 USgpm), enabling simultaneous supply to auxiliary functions. Its displacement of 45.9 cm³ per revolution produces a smaller volume per turn, which suits lower flow branches without throttling losses. The rear element is rated for 140 bar (2000 psi) so it suits valves and actuators that require moderate pressure. A rated flow of 14 USgpm at 1200 r/min offers stable performance when the drive motor runs at half speed. The first outlet is positioned opposite the inlet, making hose routing straightforward along a straight line, while the second outlet sits 135° counterclockwise from the inlet to clear adjacent components in crowded manifolds. Because shaft speed capacity matches the front at 2500 r/min, the tandem pump can be driven from a single prime mover without overspeeding either section.