Product Description
Product Overview
This page covers the Eaton Vickers VQ Series Double High-Pressure Vane Pump family in the 2520VQ configuration, including models such as 2520VQ21A1411CC20, 2520VQ21A9, 2520VQ-17A14-1CC-10R, and 2520VQ-19A14-1CC-10R. These pumps integrate two independent pump cartridges (P1 shaft-end + P2 cover-end) within a single housing, driven by one input shaft to deliver two separate hydraulic circuit outputs or combined flow for greater volume. They are widely used in mobile equipment and medium-to-high pressure industrial hydraulic systems.
Manufactured to exact Eaton Vickers dimensional and performance specifications, the core assembly consists of a cast iron body, driven rotor, intra-vanes, floating side plates, bimetallic flex plates, and precision-ground cam rings. Every pump guarantees 100% drop-in interchangeability with the original Eaton Vickers unit. Each pump undergoes comprehensive simulated duty-cycle testing prior to shipment — validating displacement accuracy, volumetric efficiency, pressure ripple, and noise levels — ensuring performance that fully matches OEM standards.
Technical Specifications
Covered Models:
- 2520VQ21A1411CC20
- 2520VQ21A9
- 2520VQ-17A14-1CC-10R
- 2520VQ-19A14-1CC-10R
Covered Series (2520VQ Double Pump):
- P1 (Shaft-End Pump): 25VQ Frame, Displacement Codes 10/12/14/15/17/19/21/25
- P2 (Cover-End Pump): 20VQ Frame, Displacement Codes 2/3/4/5/6/7/8/9/10/11/12/14
Core Performance Parameters (2520VQ Series):
- Product Type: Positive-Displacement Double Fixed Vane Pump (Dual-Action Balanced)
- Number of Vanes: 12 per cartridge
- Construction: Intra-Vane Modular Cartridge Design
- Hydraulic Balance: Diametrically opposed inlet/outlet chambers, eliminating radial hydraulic loading
- Rotation: Clockwise (R = Right) or Counter-Clockwise (L = Left) viewed from shaft end
- Mounting: SAE 4-Bolt Flange (A) or Foot Mount (F)
P1 (Shaft-End 25VQ Pump):
- Displacement Range: 32.5 ~ 81.0 cc/rev (1.98 ~ 4.94 in³/rev)
- Continuous Pressure Rating: 207 bar (3,000 psi)
- Intermittent Peak Pressure: 228 bar (3,300 psi)
- Maximum Speed: 2,700 rpm (displacement code ≤14) / 2,500 rpm (displacement code ≥17)
P2 (Cover-End 20VQ Pump):
- Displacement Range: 18.0 ~ 45.9 cc/rev (1.10 ~ 2.80 in³/rev)
- Continuous Pressure Rating: 207 bar (3,000 psi)
- Intermittent Peak Pressure: 228 bar (3,300 psi)
- Maximum Speed: 2,700 rpm
Individual Model Data:
2520VQ21A1411CC20:
- P1 Displacement Code: 21 = 67 cc/rev (4.09 in³/rev)
- P2 Displacement Code: 14 = 45 cc/rev (2.75 in³/rev)
- Port Connection: A = SAE 4-Bolt Flange
- Shaft Type: 1 = Straight Key
- Outlet Position: 1C = P1 outlet position C (inline with inlet), P2 outlet position C
- Design Number: 20
- Rotation: R = Clockwise
2520VQ-17A14-1CC-10R:
- P1 Displacement Code: 17 = 55 cc/rev (3.36 in³/rev)
- P2 Displacement Code: 14 = 45 cc/rev (2.75 in³/rev)
- Port Connection: A = SAE 4-Bolt Flange
- Shaft Type: 1 = Straight Key
- Outlet Position: CC = Both P1 and P2 outlets at position C (inline with inlet)
- Design Number: 10
- Rotation: R = Clockwise
2520VQ-19A14-1CC-10R:
- P1 Displacement Code: 19 = 62 cc/rev (3.78 in³/rev)
- P2 Displacement Code: 14 = 45 cc/rev (2.75 in³/rev)
- Port Connection: A = SAE 4-Bolt Flange
- Shaft Type: 1 = Straight Key
- Outlet Position: CC = Both P1 and P2 outlets at position C
- Design Number: 10
- Rotation: R = Clockwise
Model Code Decoding (Example: 2520VQ21A1411CC20R):
- 2520VQ = Series Designation (25VQ shaft-end + 20VQ cover-end double pump)
- 21 = P1 Shaft-End Displacement Code (67 cc/rev)
- A = Port Connection (SAE 4-Bolt Flange)
- 14 = P2 Cover-End Displacement Code (45 cc/rev)
- 1 = Shaft Type (Straight Key)
- 1 = Outlet Position Code
- CC = P1 and P2 Outlet Positions (C = Inline with Inlet)
- 20 = Design Number
- R = Clockwise Rotation
Key Technical Advantages
Intra-Vane Cartridge Design
The VQ series employs Vickers’ industry-first intra-vane modular cartridge architecture, integrating the cam ring, rotor, intra-vanes, and floating side plates into a single self-contained plug-in assembly. The dual-element vane structure (mother vane + sub-vane composite) provides hydraulic assist force to the vanes under high-pressure conditions — the sub-vane extends first under oil pressure, with the mother vane following, creating a double-sealing effect that significantly reduces contact stress between vane tips and the cam ring inner profile. On-site maintenance requires only end-cap removal for complete cartridge replacement — no need to disconnect the pump from system piping, reducing downtime by up to 70%.
The VQ series employs Vickers’ industry-first intra-vane modular cartridge architecture, integrating the cam ring, rotor, intra-vanes, and floating side plates into a single self-contained plug-in assembly. The dual-element vane structure (mother vane + sub-vane composite) provides hydraulic assist force to the vanes under high-pressure conditions — the sub-vane extends first under oil pressure, with the mother vane following, creating a double-sealing effect that significantly reduces contact stress between vane tips and the cam ring inner profile. On-site maintenance requires only end-cap removal for complete cartridge replacement — no need to disconnect the pump from system piping, reducing downtime by up to 70%.
12-Vane Low Noise Design
The VQ series features a 12-vane system that increases flow pulsation frequency while reducing amplitude. Combined with Vickers’ optimized elliptical eccentric cam ring profile and smooth transition curves, this design minimizes vane-to-stator impact and delivers operating noise levels as low as 62 dB(A). The extremely low flow pulsation makes it particularly suitable for noise-sensitive indoor industrial environments such as injection molding shops and precision machine tool facilities.
The VQ series features a 12-vane system that increases flow pulsation frequency while reducing amplitude. Combined with Vickers’ optimized elliptical eccentric cam ring profile and smooth transition curves, this design minimizes vane-to-stator impact and delivers operating noise levels as low as 62 dB(A). The extremely low flow pulsation makes it particularly suitable for noise-sensitive indoor industrial environments such as injection molding shops and precision machine tool facilities.
Double Pump Circuit Design
The 2520VQ double pump integrates two independent cartridges within a single housing, driven by one input shaft to deliver two separate hydraulic circuit outputs. This design eliminates the need for double-shaft extension electric motors or additional motors and drive couplings, significantly reducing installation space and cost. It provides valuable circuit design flexibility — for example, combining high-pressure low-flow (P1) with low-pressure high-flow (P2) on a single input drive to meet differentiated flow and pressure requirements of multiple actuators.
The 2520VQ double pump integrates two independent cartridges within a single housing, driven by one input shaft to deliver two separate hydraulic circuit outputs. This design eliminates the need for double-shaft extension electric motors or additional motors and drive couplings, significantly reducing installation space and cost. It provides valuable circuit design flexibility — for example, combining high-pressure low-flow (P1) with low-pressure high-flow (P2) on a single input drive to meet differentiated flow and pressure requirements of multiple actuators.
Hydraulically Balanced Construction
The VQ series features diametrically opposed inlet and outlet chambers that completely balance radial hydraulic forces on the rotor, eliminating radial hydraulic loading on the bearings. This design fundamentally addresses the uneven bearing stress and premature failure modes inherent in unbalanced pump architectures, significantly extending bearing service life while reducing operational noise and vibration.
The VQ series features diametrically opposed inlet and outlet chambers that completely balance radial hydraulic forces on the rotor, eliminating radial hydraulic loading on the bearings. This design fundamentally addresses the uneven bearing stress and premature failure modes inherent in unbalanced pump architectures, significantly extending bearing service life while reducing operational noise and vibration.
Floating Side Plate with Automatic Clearance Compensation
The VQ series features a breakthrough floating side plate structure that intelligently and automatically compensates for end-face clearance. Even under high-pressure operation, the side plate maintains intimate contact with the rotor face, effectively minimizing end-face leakage and ensuring the pump sustains outstanding volumetric efficiency (≥90%) throughout its service life. The side plate is constructed from bimetallic material, significantly enhancing seizure resistance and further extending operational life.
The VQ series features a breakthrough floating side plate structure that intelligently and automatically compensates for end-face clearance. Even under high-pressure operation, the side plate maintains intimate contact with the rotor face, effectively minimizing end-face leakage and ensuring the pump sustains outstanding volumetric efficiency (≥90%) throughout its service life. The side plate is constructed from bimetallic material, significantly enhancing seizure resistance and further extending operational life.
Application Areas
- Construction Equipment: Excavator auxiliary hydraulic systems, loader work implements, bulldozer ripper drives, and other medium-pressure mobile equipment
- Injection Molding Machines: Multi-stage hydraulic power source for clamping, injection, and ejection — double pump enables combining high-pressure low-flow (injection/holding) with low-pressure high-flow (clamping/rapid return) on a single motor for energy optimization
- Die Casting Machines: High clamping force with fast cycle rates — high volumetric efficiency minimizes oil temperature rise
- Machine Tool Hydraulic Systems: Independent supply for feed drives, clamping circuits, and spindle drives — low pulsation ensures machining precision
- Hydraulic Presses: High-pressure power source for metal forming, stamping, and drawing operations
- Material Handling Equipment: Forklift lift and tilt systems, AGV drive systems
- Metallurgical Equipment: Mill screw-down systems, continuous casting vibration tables — heavy-duty continuous operation
- Marine Deck Machinery: Capstans, windlasses, and cranes requiring reliable medium-pressure hydraulic drive
Expert Maintenance Tips
- Fluid Cleanliness Control: Maintain hydraulic oil cleanliness at ISO 4406 17/14/11 or better. The precision clearances between the intra-vanes and cam ring inner profile are critical — particulate contamination accelerates wear, causing volumetric efficiency loss and increased internal leakage. Install a 10 μm absolute filter on the return line.
- Viscosity & Temperature Management: Recommended fluid: anti-wear hydraulic oil with viscosity grade ISO VG 32–68 at 40°C (or automotive crankcase oil with SC/SD/SE/SF designation). At rated speed and pressure, recommended viscosity range is 13 cSt minimum to 54 cSt maximum (corresponding to oil temperatures of 49°C minimum to 65°C maximum). Continuous oil temperature must not exceed 99°C, or cartridge and seal life will be significantly reduced.
- Cold Start Precautions: When operating with SAE 10W oil in the 860 to 54 cSt viscosity range, speed and pressure must be limited to 50% of their respective ratings until the system is fully warmed up. When oil viscosity exceeds 860 cSt at startup, special care must be taken to ensure the entire system is thoroughly warmed before gradually applying load.
- Shaft Alignment: Pump-to-driver concentricity must be strictly controlled. A flexible coupling is strongly recommended to absorb misalignment and prevent bearing damage from bending moments or radial loads. Tighten flange mounting bolts in a diagonal pattern to ensure reliable face sealing.
- Suction Line Requirements: Inlet vacuum must be strictly controlled. Mount the pump as close to the reservoir as possible. All suction line connections and flanges must be airtight — air ingress causes cavitation, increased noise, and reservoir foaming.
- Seal Material Compatibility: Standard seals (no F3 prefix) are suitable for mineral-based hydraulic oils and water-glycol fluids. If the system operates with phosphate ester fire-resistant fluids, the F3-prefix model designation must be selected (e.g., F3-2520VQ21A1411CC20), which features Viton (FKM) seal material. Using standard NBR seals with phosphate ester fluids will cause seal swelling and catastrophic failure.
- Cartridge Replacement Interval: Inspect vane wear and cam ring inner profile condition every 5,000 operating hours. Replace the cartridge assembly when volumetric efficiency drops by more than 15% or noise levels increase noticeably. The modular cartridge design enables field replacement in 30–60 minutes without removing the pump from the system.
- Double Pump Shaft Load Verification: Do not simply assume both pump sections can be loaded to rated pressure simultaneously. Always verify the drive shaft torque rating to ensure total input torque does not exceed the shaft’s permissible value. Misalignment will cause heavy bearing loads and premature failure.
Company Profile
Frequently Asked Questions
1.What ls our Main Products?
1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts
2. What about the MOQ?
3.What are your advantages?
- Adhere to quality first.
- Support customization, ODM & OEM service.
- 1-year warranty and complete after-sales support.
- Safe and fast shipping worldwide.
- 24-hour online service for your inquiries.
4.Are you a manufacturer? What’s your delivery time?
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
5.Which payment methods are accepted?
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
6.How will you deliver my goods?
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
All deliveries ensure door-to-door fast and safe service.
7.How do you inspect and guarantee your products?
All products are tested before shipment to ensure perfect working condition.
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
8.What about after-sales service?
If you encounter any problem during use, please contact your sales manager or our support team at any time.
We will respond quickly and help solve the issue efficiently.
9.What are your main applications?
- Hydraulic systems
- Agricultural machinery
- Construction machinery
- Automobile industry
- Local distributors and maintenance centers
10.Can I get a discount for bulk orders?
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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