Yuken PV2R3-94-L-RAA-31 Vane Pump

Yuken PV2R3-94-L-RAA-31 High-Pressure Single Vane Pump

The Yuken PV2R3-94-L-RAA-31 is a fixed-displacement rotary vane pump engineered for high-pressure hydraulic circuits demanding minimal operating noise and low ripple flow. Built with an intra-vane hydraulic balancing mechanism, this pump minimizes shaft journal and bearing loads, ensuring sustained volumetric efficiency over extensive running hours under continuous high-duty regimes. Featuring a 93.6 cm³/rev nominal displacement, this unit utilizes an interchangeable cartridge assembly housed within a ductile iron casing.

This configuration allows complete internal drive overhaul and displacement reconfiguration in field installations without unseating pipe connections or disturbing drive alignment. The PV2R3-94-L-RAA-31 configuration is specifically provisioned with a foot mounting bracket, right-hand (clockwise) shaft rotation, and top-facing suction and discharge flange ports.

Features

1. Intra-Vane Hydraulic Balancing: Radially balanced dual-eccentric cam ring design neutralizes radial hydraulic side-loads on the shaft bearings, maximizing service life at continuous peak pressures up to 21 MPa (210 bar).
2. Acoustically Attenuated Profile: Engineered circular-arc cam profile dampens internal pressure-shock spikes and flow pulsations, maintaining sound emissions below 72 dB(A) at 1450 r/min.
3. Modular Cartridge Kit Construction: Rotor, vanes, cam ring, and thrust plates are self-contained in a standalone cartridge kit, enabling field servicing or flow rating adjustments without dismantling piping.
4. Rigid Foot-Mount Casting: High-rigidity base mount geometry resists structural torsional deflection under rapid cycling and cyclical fluid acceleration.
5. Standardized SAE 4-Bolt Interface: Suction (2″) and delivery (1-1/4″) ports conform strictly to SAE J518 Code 61 4-bolt split flange standards for high seal integrity under pulsation.

Compatibility

• Plastic Processing Machinery: Sumitomo, Nissei, Toshiba, and Fanuc hydraulic injection molding machines, mold clamping circuits, and screw-drive boost units.
• Industrial Metalworking: Aida, Komatsu, and Amada hydraulic stamping presses, pipe bending benches, and hydraulic die-cut machinery.
• Marine Deck & Steering Systems: Electro-hydraulic power units (HPUs) driving anchor windlasses, mooring winches, continuous-flow steering gear actuators, and hatch cover davit rams.
• Material Handling & Power Packs: Continuous-duty secondary power units on marine cranes, balers, scrap compactors, and foundry ladle tilters.

Cross-References & Equivalent Codes

• Yuken Alternate Codes: PV2R3-94-L-RAA-30, PV2R3-94-L-RAA-3180 (European metric flange thread variant)
• Flange Mount Variant Equivalent: PV2R3-94-F-RAA-31 (requires foot bracket conversion kit)
• Replacement Cartridge Kit: CPV2R3-94-31 (complete rotor, vane, and cam assembly kit)
• Vickers / Eaton Equivalents: 35V / 35VQ series (38 gpm rating equivalent; check shaft and port adaptation prior to installation)

Frequently Asked Questions

What does “RAA” designate in the Yuken PV2R3 model code?

“RAA” breaks down into three key mechanical orientations viewed from the shaft end: the first “R” denotes right-hand (clockwise) shaft rotation; the second “A” indicates that the discharge outlet port faces directly upwards; the third “A” signifies that the suction inlet port faces directly upwards.

Can the port configuration of the PV2R3-94-L-RAA-31 be rotated in the field?

Yes. The discharge and suction ports can be reoriented in 90-degree increments relative to each other by loosening the casing assembly tie-bolts and rotating the front housing or outlet body. However, the internal cartridge alignment pins must remain strictly seated in their index holes to prevent port blockage and immediate pump destruction.

What is the primary difference between PV2R3-94-L and PV2R3-94-F?

The “L” designation specifies a foot-mounted cast body designed for horizontal mounting directly onto a skid or tank deck plate. The “F” designation indicates an SAE 2-bolt or 4-bolt pilot flange designed to mount directly onto an electric motor bellhousing or gearbox flange adapter. Internal displacement cartridges are interchangeable between both bodies.

What fluid types are approved for the PV2R3-94-L-RAA-31?

The standard 31-design pump uses NBR seals suited for ISO VG 32, 46, and 68 mineral-based anti-wear hydraulic oils. If your system runs water-glycol or synthetic phosphate esters (such as Skydrol or Fyrquel), you must order the fluorocarbon (FKM/Viton) seal package, designated with the prefix “F-” (Model: F-PV2R3-94-L-RAA-31).

Why does the pump exhibit excessive noise or high vibration immediately following startup?

Elevated noise in a vane pump almost always points to either aeration or cavitation. Inspect the 2-inch suction flange O-ring for air leakage, confirm the inlet line is completely bled of air, ensure that fluid viscosity has dropped within operational limits (below 400 cSt), and verify that pump rotation strictly matches motor drive direction. Running in reverse will strip vane edges within seconds.