Vickers | 25VQ21A-1C20
25VQ21A 1C20
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The 25VQ21A 1C20 pump is manufactured by Vickers as part of the VQ Thru-Drive Vane Pumps series. It is identified by design number 20, which aligns its internal geometry with other size-25 frames in the range. A flange mount arrangement lets the housing bolt directly to standard hydraulic power units, reducing bracket requirements. Fluid enters through an SAE 4-bolt flange inlet, a connection that withstands high flow without thread fatigue, and it exits through an SAE straight-thread outlet positioned opposite the inlet to simplify rigid pipe routing. The shaft is driven clockwise when viewed from the shaft end, so the installation must match right-hand rotation. Power transfer is made through a 3/16 in square key, ensuring positive torque transmission between the shaft and coupling.
During operation, the pump delivers 67.5 cm³ per revolution (4.12 in³/rev) of displacement, providing 146.2 L/min (38 US gpm) at maximum speed for applications requiring steady medium-volume flow. It sustains system pressures up to 210 bar (3000 psi) while limiting inlet pressure to 1.4 bar (20 psi) on the positive side and 5 in Hg of vacuum, conditions that protect the vane tips from cavitation. At full speed and 210 bar the input power demand reaches 61.9 kW (83 hp), data used to size prime movers. When driven at 1200 r/min against 7 bar the unit achieves the SAE rating of 21 US gpm, offering a baseline for efficiency comparisons.
Technical Specifications
Design Number
20
Geometric Displacement
67.5 cm3/rev (4.12 in3/rev)
Inlet Port Connection
SAE 4-Bolt Flange
Inlet Vacuum Limit
5 inHg (max)
Input Power @ Max Speed (210 Bar)
61.9 kW (83 hp)
Key Size
3/16 in Square
Max Flow @ Max Speed
146.2 l/min (38 USgpm)
Max Inlet Positive Pressure
1.4 bar (20 psi)
Maximum Pressure
210 bar (3000 psi)
Mounting
Flange Mount
Outlet Port Connection
SAE Straight Thread
Outlet Position
Opposite Inlet
Rotation (shaft End View)
Right-Hand (CW)
Sae Rating (1200 R/min, 7 Bar)
21 USgpm
1620 Old Apex Road
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