2520VQ21A14 11AA20

The 2520VQ21A14 11AA20 vane pump belongs to the VQ Thru-Drive Vane Pumps series from Vickers and is intended to supply dual hydraulic circuits in automation systems. The cover-end displacement is 45.4 cm³ per revolution (2.77 in³ per revolution), which establishes the oil volume delivered by that section each shaft turn so flow can be predicted when speed changes. Its rated cover-end flow reaches 14 gpm at 1200 rpm, providing steady medium-volume delivery for secondary actuators. A maximum cover-end pressure of 140 bar (2000 psi) limits system loading and protects seals in moderate-pressure circuits. The cover-end section can spin up to 2700 rpm, allowing high-speed operation when short cycle times are required. Right-hand clockwise rotation simplifies coupling to standard SAE engines and electric motors. Outlet positions identified as O1 opposite and O2 at 135 degrees counter-clockwise let designers route return lines without sharp bends, and all inlet and outlet ports use SAE four-bolt flanges to ensure uniform gasket compression and quick service access.

The shaft-end section supports higher capacities for primary functions in the same machine. Its displacement is 67.5 cm³ per revolution (4.12 in³ per revolution), so each rotation moves a larger volume to satisfy main actuator flow demands. A corresponding rated flow of 21 gpm at 1200 rpm ensures adequate supply for cylinders or motors that need greater throughput. Maximum shaft-end pressure is 210 bar (3000 psi), which accommodates heavy-duty loads without exceeding component limits. The shaft-end speed ceiling is 2500 rpm, slightly lower than the cover end so thermal growth and bearing life remain within safe margins under full pressure. The complete pump weighs 20.5 kg (45 lb), enabling single-person handling during installation while still providing the mass needed for vibration damping in continuous service. A thru-drive mounting pad on the rear face allows an auxiliary pump to be coupled inline, reducing motor count in complex hydraulic power units.