Eaton Vickers 2520V21A12 1AA22R Hydraulic Double Vane Pump

Eaton Vickers 2520V21A12 1AA22R Hydraulic Double Vane Pump

The Eaton Vickers 2520V21A12 1AA22R is a double intra-vane pump engineered to drive two independent hydraulic circuits from a single prime mover. Utilizing Vickers’ 12-vane hydraulic balancing technology, radial bearing loads are hydrostatically cancelled out across diametrically opposed pressure ports, delivering exceptional volumetric efficiency, extended bearing fatigue life, and minimal acoustic signature under heavy continuous duty.

The double-cartridge architecture features independent rotating groups: a 25V frame shaft-end pump combined with a 20V frame cover-end pump. This makes it an ideal fit for split-flow power packs, mobile industrial handling units, machine-tool clamping/feed circuits, and marine auxiliary deck machinery where simultaneous high-flow primary transfer and medium-flow secondary control are required.

Model Breakdown: 2520V – 21 – A – 12 – 1 – AA – 22 – R

• 2520V : Heavy-Duty Intra-Vane Double Pump Series (25V Shaft End + 20V Cover End)
• 21 : Shaft-End Delivery Rating: 21 US GPM @ 1200 RPM, 100 PSI (67.0 cm³/rev / 4.09 in³/rev)
• A : Inlet Port Configuration: 4-Bolt SAE Code 61 Flange (2-1/2 Inch)
• 12 : Cover-End Delivery Rating: 12 US GPM @ 1200 RPM, 100 PSI (39.0 cm³/rev / 2.38 in³/rev)
• 1 : Drive Shaft Style: Straight Keyed (Standard SAE B / SAE B-B Profile)
• AA : Port Orientations: #1 Outlet Opposite Inlet | #2 Outlet 135° CCW from Inlet
• 22 : Design Series Code: 22nd Design Generation
• R : Direction of Rotation: Right-Hand / Clockwise (viewed from drive shaft end)

Model Details:

• Manufacturer: Eaton / Vickers (Danfoss Power Solutions)
• Manufacturer Part Number (MPN): 2520V21A12-1AA22R
• Assembly / Drawing Code: 02-137209 series / I-3186-S
• Condition: Brand New (Factory OEM, Unused, OEM Pressure-Bench Tested)
• Shaft Rotation: Clockwise (Right-Hand) looking at the drive shaft snout

Technical Details

Features

1. Hydraulically Balanced Double-Vane Design: Internal opposed-porting eliminates side-loading on drive shaft bearings, ensuring minimal wear and extended service life under 172 bar (2500 PSI) working conditions.
2. Modular Dual-Cartridge System: Independent shaft-end (25V) and cover-end (20V) intra-vane cartridge kits allow full field serviceability and displacement conversion without disconnecting port plumbing or dismounting the pump body.
3. Low Noise & Acoustic Dampening: Intra-vane construction regulates vane-tip loading against the cam ring, sharply reducing flow pulsation and decibel levels below typical gear or piston units.
4. High Contamination Tolerance: 12-vane profile expels micro-particulates effectively across broad industrial and marine duty cycles while sustaining up to 90% volumetric efficiency.
5. Standardized SAE Interface: Standard SAE 2-bolt mounting flange and SAE 4-bolt Code 61 split-flange hydraulic connections ensure drop-in replacement across legacy machinery.

Frequently Asked Questions

Can the flow ratings of the P1 and P2 sections be modified independently?

Yes. Both the shaft-end (25V frame) and cover-end (20V frame) utilize self-contained, drop-in cartridge assemblies. You can change the displacement of either circuit (for example, stepping the shaft-end down to 14 or 17 GPM, or the cover-end down to 5, 8, or 11 GPM) simply by dropping in a different OEM-rated cartridge kit without replacing the main pump body or piping.

What is the difference between standard rotation and the “R” designation?

The “R” suffix specifies standard right-hand (clockwise) shaft rotation when viewing the pump directly facing the drive shaft extension. If your prime mover rotates counter-clockwise (left-hand rotation), you must order the “L” version (model code ending in 22L) or invert the internal cam rings and side plates prior to system commissioning.

Does this pump require an external case drain line?

No. Vickers 2520V pumps are internally drained back into the common suction chamber. They do not require a secondary external case drain line to tank, which simplifies plumbing down to three total line connections: one suction port and two pressure discharge ports.

Can I run synthetic fire-resistant fluids in the 2520V21A12?

Yes, but you must confirm the seal compound. Standard units feature Buna-N (NBR) seals, which are optimized for petroleum and water-glycol fluids. For synthetic polyol esters or phosphate esters, specify the F3-prefix option (F3-2520V…), which comes factory-assembled with fluorocarbon / Viton seals.