Vickers | 4525VQ42A21-1AA20
4525VQ42A21 1AA20
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The 4525VQ42A21 1AA20 vane pump is manufactured by Vickers as part of the VQ Thru-Drive Vane Pumps series and is intended to drive hydraulic actuators in automated machinery. Its front pumping element has a displacement of 138.7 cm³ per revolution, so each shaft rotation moves that volume of oil into the circuit. A rated flow of 42 USgpm at 1200 r/min provides a predictable supply for medium-duty tooling functions. The front section can run up to 2200 r/min, enabling higher throughput when faster cycles are required. System loading is limited by a front maximum pressure of 175 bar, which defines the safe operating envelope for valves and hoses. When the pump is driven at top speed and pressure it outputs 255.8 L/min while absorbing 91.4 kW of input power, figures that help designers size prime movers and cooler capacity. A flange mount with a single shaft seal permits direct attachment to standard motor flanges while restricting external leakage.
The rear thru-drive stage supports auxiliary circuits with a displacement of 67.5 cm³ per revolution, allowing a secondary flow path without an additional drive motor. At a nominal 1200 r/min it delivers 21 USgpm, suitable for pilot or lube branches that must run continuously. When operated at maximum speed and pressure the rear stage supplies 125.0 L/min and draws 54.5 kW, giving planners clear data on power splitting and heat rejection. The rear outlet can sustain up to 210 bar, which matches typical high-pressure servo manifolds. A rated maximum speed of 2200 r/min keeps both pump sections synchronized on a common shaft to simplify coupling selection. All ports use SAE 4-bolt flanges so hoses or hard lines can be connected without adapters, and the No.1 opposing inlet with No.2 positioned 135° counter-clockwise arranges the plumbing to clear the mounting face.
Technical Specifications
Front Displacement
138.7 cm3/rev (8.46 in3/rev)
Front Flow @ Max Speed & Pressure
255.8 L/min (66.5 USgpm)
Front Input Power @ Max Speed & Pressure
91.4 kW (122.5 hp)
Front Max Pressure
175 bar (2500 psi)
Front Rated Flow @ 1200 R/min
42 USgpm
Front Rated Max Speed
2200 r/min
Mounting & Seals
Flange mount, single shaft seal
Port Connections
SAE 4-bolt flange (all ports)
Port Orientation
No.1 Opp. Inlet; No.2 135° CCW (AA)
Rear Displacement
67.5 cm3/rev (4.12 in3/rev)
Rear Flow @ Max Speed & Pressure
125.0 L/min (33 USgpm)
Rear Input Power @ Max Speed & Pressure
54.5 kW (73 hp)
Rear Max Pressure
210 bar (3000 psi)
Rear Rated Flow @ 1200 R/min
21 USgpm
Rear Rated Max Speed
2200 r/min
1620 Old Apex Road
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