35VQ25AF 1B20

The 35VQ25AF 1B20 vane pump is manufactured by Vickers as part of the VQ Thru-Drive Vane Pumps series and is intended to supply pressurized oil for hydraulic automation where a thru-drive lets an additional pump share the same shaft. Its displacement is 81.6 cm³ per revolution (4.98 in³/r), so each rotation moves a fixed charge that stabilizes flow calculations. A maximum operating pressure of 210 bar (3000 psi) permits the pump to run cylinders and motors that need moderate system pressure. The rotor can turn up to 2500 r/min, enabling compact electric motors to achieve required output without oversizing. Driving the unit at its highest speed and pressure demands 75.3 kW (101 hp), information used to select a suitable prime mover. Inlet pressure may not exceed 1.4 bar (20 psi) because higher values could load the front seal. The assembled weight of 22.7 kg (50 lb) affects mounting plate thickness and ease of manual handling during maintenance.

At 1200 r/min and 7 bar the pump produces a rated flow of 25 US gpm, giving designers a midpoint figure for sizing heat exchangers and return lines. When driven at peak speed it delivers about 173.1 L/min (45 US gpm), supporting rapid actuator cycles in automated presses or test stands. The suction side tolerates a vacuum of 5 in Hg, allowing the reservoir to sit below the pump as long as this limit is observed. A shaft diameter of 31.75 mm (1.250 in) offers a sturdy interface for torque transfer, while a 7.92 mm (0.312 in) key width prevents hub slippage during load reversals.