3520VQ30A8 1XX20

The 3520VQ30A8 1XX20 vane pump belongs to the VQ Thru-Drive Vane Pumps series and is manufactured by Vickers for hydraulic automation where a thru-drive unit powers multiple circuits. It carries design code 20, indicating its internal configuration and interchange compatibility. Rotation is clockwise so the pump must be mounted in a circuit that matches this direction of flow. The shaft major diameter measures 1.250 in, which determines the coupling size that can transmit torque from the prime mover. A 5/16 square key with a width of 0.313 in secures the shaft to the drive and prevents slippage under load. SAE 4-bolt flange ports are provided for the inlet, O1, and O2 connections so standard hydraulic flanges can be used during installation. On the shaft end, the pump delivers 97.7 cm³ per revolution (5.96 in³ per revolution) to supply a rated flow of 30 US gallons per minute, supporting high-volume actuators. The shaft-end section tolerates continuous pressures up to 210 bar (3000 psi), making it suitable for heavy-duty industrial machines.

The shaft end also sustains speeds up to 2500 rpm, allowing it to match typical electric motor outputs without exceeding mechanical limits. The cover end is sized at 27.4 cm³ per revolution (1.67 in³ per revolution) and supports auxiliary circuits that require more moderate volumes. From this displacement, the cover end provides a rated flow of 8 US gallons per minute to feed pilot controls or lubrication manifolds. Like the shaft end, the cover end withstands working pressures of 210 bar (3000 psi) so both sections can share a common high-pressure line. A maximum speed limit of 2500 rpm applies to the cover end as well, ensuring balanced operation when both pumping elements run from the same drive. The clockwise thru-drive arrangement lets the cover end pass residual torque to an auxiliary pump if needed for compound circuits. Together, the dual displacement arrangement within design code 20 enables one housing to deliver 30 and 8 US gpm simultaneously, simplifying plumbing in compact hydraulic power units.