PVQ20-B2R-SS1S-21-C21-12 Vickers PVQ Series Piston Pump 210 Bar

Product Overview

The PVQ20-B2R-SS1S-21-C21-12 and PVQ20-A2R-SS1S-10-C21D-11 both belong to the Eaton Vickers PVQ Series industrial variable displacement piston pump family, featuring an open-circuit swashplate axial piston variable displacement design specifically engineered for industrial hydraulic systems. The PVQ series covers displacements from 10 to 45 cc/rev (PVQ10/13/20/32/40/45), with pressure compensator control and rated working pressures up to 210 bar (3045 psi), widely used in machine tools, injection molding machines, die-casting machines, and other industrial hydraulic applications for its low noise, high efficiency, and high reliability.

The PVQ20-B2R-SS1S-21-C21-12 (Manufacturer Part No. 02-341561) has a displacement of 21.1 cc/rev (1.29 in³/rev), right-hand rotation, equipped with a 2-bolt SAE B flange mounting, 0.875″ straight keyed shaft, 1.6250″ O-ring side ports, and a pressure compensator setting of 210 bar (3000 psi). The PVQ20-A2R-SS1S-10-C21D-11 is a variant in the same series featuring a damped pressure compensator with load-sense differential pressure set at 11 bar.

The PVQ20, as a representative of the Quiet Series, operates at a noise level of only 71 dB. The mounting flange, drive shaft, and port layout are identical to the original Eaton Vickers pump, enabling direct bolt-on replacement. Every pump undergoes 100% simulated operating-condition testing before shipment.

Technical Specifications 

Model Identification:

• PVQ20-B2R-SS1S-21-C21-12 — Manufacturer Part No. 02-341561, 21.1 cc/rev, right-hand rotation, SAE B 2-bolt flange, keyed shaft, side ports, C21 pressure compensator

• PVQ20-A2R-SS1S-10-C21D-11 — 21.1 cc/rev, right-hand rotation, C21D damped pressure compensator, load-sense differential pressure 11 bar

• Model code breakdown: PVQ20=series/displacement class, B2R/A2R=mounting flange and rotation direction, SS1S=drive shaft specification, 21=displacement code 21.1 cc/rev, C21=pressure compensator 210 bar setting, 12=port configuration

Displacement (PVQ Full Series):

• PVQ10: 10.5 cc/rev (0.643 in³/rev)

• PVQ13: 13.8 cc/rev (0.843 in³/rev)

• PVQ20: 21.1 cc/rev (1.29 in³/rev)

• PVQ32: 32.9 cc/rev (2.01 in³/rev)

• PVQ40: 40.0 cc/rev

• PVQ45: 45.1 cc/rev (2.75 in³/rev)

Pressure Ratings (PVQ20):

• Rated working pressure: 210 bar (3045 psi)

• Maximum pressure: 210 bar (3000 psi)

• Pressure compensator standard setting: C21 = 207-210 bar (3000 psi), adjustment range 24-210 bar (350-3000 psi)

• Maximum case pressure: 0.35 bar

Speed Range (PVQ20):

• Maximum speed: 1800 rpm

• Minimum speed: 600 rpm

Flow and Noise (PVQ20):

• Flow at rated speed: 38 L/min (10.0 GPM @ 1800 rpm)

• Operating noise level: 71 dB

Control Types:

• Pressure Compensator (PC) Control — C21 standard pressure compensator with setting of 210 bar (3000 psi), automatically reduces swashplate angle to maintain constant pressure when system pressure reaches the set value

• Damped Pressure Compensator (C21D) Control — Adds damping structure to the standard pressure compensator, effectively suppressing pressure fluctuation and system oscillation, ideal for precision industrial hydraulic systems requiring high pressure stability

• Load Sensing Control — Optional load sensing port available for automatic displacement adjustment based on load pressure signal

Structural Parameters:

• Pump type: Open-circuit swashplate axial piston variable displacement

• Design series: Quiet Series

• Mounting flange: 2-bolt SAE B

• Drive shaft: 0.875″ (22.2 mm) straight keyed

• Rotation: Right-hand (clockwise), viewed from shaft end

• Port position: Side ports, 1.6250″ SAE O-ring port

• Housing material: Cast iron

• Weight: Approximately 14.1 kg (31.0 lbs)

Hydraulic Fluid and Operating Conditions:

• Recommended fluid: ISO VG32 / VG46 anti-wear hydraulic oil

• Optimal operating viscosity range: 10-39 cSt

• Operating oil temperature range: -20°C to +90°C

• Cleanliness requirement: ISO 4406 18/16/13 or better

Key Technical Advantages

1. Quiet Series Design Delivers 71 dB Low Noise Operation

The PVQ series, as Eaton Vickers’ Quiet Series product, achieves a noise level of 71 dB through optimized port plate structure, precision-lapped piston-cylinder interfaces, and acoustic housing design. This represents a significant noise reduction compared to conventional industrial piston pumps, helping equipment manufacturers meet increasingly stringent industrial noise emission regulations while improving operator working environments.

2. C21D Damped Pressure Compensator Suppresses System Oscillation

The C21D pressure compensator on the PVQ20-A2R-SS1S-10-C21D-11 adds a damping structure to the standard C21 compensator, effectively suppressing system oscillation and pressure overshoot during pressure compensation. When system pressure reaches the set value, the damping structure enables smoother compensator spool movement and more gradual swashplate angle changes—particularly suited for precision industrial hydraulic systems such as injection molding machines and die-casting machines requiring extremely high pressure stability.

3. Complete Industrial Hydraulic System Drop-in Interchange Solution

The PVQ series mounting flange (2-bolt SAE B), drive shaft (0.875″ keyed), port size (1.6250″ SAE O-ring side ports), and overall dimensions maintain 1:1 dimensional compatibility with original Eaton Vickers pumps. The PVQ20-B2R-SS1S-21-C21-12 enables direct replacement of original pumps without piping modification or adapter plates. The series covers seven displacement sizes from 10 to 45 cc/rev (PVQ10/13/20/25/32/40/45), allowing flexible selection of the most suitable displacement for equipment flow requirements.

4. Precision-Machined Rotating Group Ensures High Volumetric Efficiency

Piston-cylinder interfaces undergo precision lapping, and the valve plate is optimized to reduce pressure pulsation and flow ripple. The pressure compensator achieves constant pressure output through a precision servo piston-swashplate mechanism. When system pressure reaches the C21 compensator setting of 210 bar, the compensator spool shifts, and the servo piston pushes the swashplate to reduce the angle, decreasing displacement. Stable volumetric efficiency is maintained at 210 bar continuous duty with high overall efficiency.

5. Compact Cast Iron Housing for Industrial-Grade Reliability

The PVQ20 features a compact cast iron housing design with single pump weight of only approximately 14.1 kg. At 21.1 cc/rev displacement, it achieves 210 bar rated working pressure and 1800 rpm maximum speed. The cast iron housing provides excellent heat dissipation and structural rigidity, maintaining stable performance under continuous long-term operation in industrial hydraulic systems. The pressure compensator adjustment range of 24-210 bar (350-3000 psi) allows flexible pressure setting according to system requirements.

Application Areas

• Injection molding machine hydraulic power systems (clamping, injection, holding pressure circuits)

• Die-casting machine hydraulic power systems

• Machine tool hydraulic systems (hydraulic chucks, hydraulic turrets, tailstocks)

• Hydraulic presses and bending machine hydraulic systems

• Metallurgical equipment hydraulic power units

• Industrial hydraulic power units (HPU)

• Marine hydraulic systems and deck machinery

• Papermaking machinery and printing machinery hydraulic systems

Expert Maintenance Tips

1. Pre-Installation Model Verification

Verify the complete model code on the pump nameplate before installation. The PVQ20-B2R-SS1S-21-C21-12 is configured for right-hand rotation, with a 0.875″ keyed drive shaft (SS1S code) and 2-bolt SAE B mounting flange. The PVQ20-A2R-SS1S-10-C21D-11 features a damped pressure compensator configuration (C21D code). Ensure drive shaft-to-coupling concentricity within 0.05 mm. Install the pump such that the case drain port maintains oil level at or above the unit centerline.

2. Hydraulic Fluid Cleanliness Requirements

Use ISO VG32 / VG46 anti-wear hydraulic oil with optimal operating viscosity range of 10-39 cSt. Fluid cleanliness should be ISO 4406 18/16/13 or better. Suction filter rating should be no coarser than 10 μm. Operating oil temperature range: -20°C to +90°C. Flush the system thoroughly before first operation to eliminate residual metallic particles.

3. Case Drain Line Installation

Provide a properly sized case drain line with maximum case pressure not exceeding 0.35 bar. The drain line end should always remain submerged below the reservoir oil level to prevent air ingestion. In closed-circuit systems, the case drain line should return directly to the reservoir, separate from the system return line.

4. First Start-Up Procedure

Before first start, confirm the suction line is properly sealed, the reservoir is at the correct level, and oil level is at or above the pump centerline. Run at 600-800 rpm unloaded for 5-10 minutes to purge air. Confirm no suction line leakage and steady oil flow from the case drain line before gradually increasing speed and loading to rated conditions. The pressure compensator C21 setting is 210 bar, adjustable via the adjustment screw on the control valve, with an adjustment range of 24-210 bar. For C21D damped compensator models, note that the damping structure may affect response speed during adjustment.

5. Routine Maintenance

Replace hydraulic oil filters every 2,000 operating hours or annually. Periodically inspect the pump exterior for leaks and check the drive shaft seal for aging or cracks. If flow decline or pressure instability is observed, prioritize inspection of the valve plate and piston-cylinder wear. For C21D models, also inspect the damping structure for blockage or wear. Recommended overhaul interval: no more than 8,000 operating hours or 5 years. Always refer to Eaton official repair manual during installation.