Eaton Vickers PVB5 PVB6 axial piston hydraulic pump

The PVB series is a family of pressure-compensated, variable displacement axial piston pumps. Vickers developed the line, and it now sits within Eaton's hydraulics portfolio following Eaton's acquisition of Vickers. The frame sizes run upward in numbered steps (PVB5, PVB6, PVB10, PVB15, PVB20, PVB29 and PVB45), with the number loosely indicating relative pump size.

PVB5 and PVB6 are the compact end of the range. They suit applications where you need a few gallons per minute of flow, a stable pressure, and a pump that doesn't waste horsepower when the circuit is idle.

How a PVB5 or PVB6 Pump Works

Inside the housing, a drive shaft turns a cylinder block carrying a ring of pistons. The piston shoes ride against an angled surface, the yoke (the PVB design uses a yoke-style swashplate arrangement). As the block rotates, each piston strokes in and out, drawing oil from the inlet side and pushing it to the outlet.

The Role of the Yoke Angle

The angle of the yoke sets the piston stroke, and therefore the displacement per revolution. A steeper angle means more stroke and more flow. A near-zero angle means almost no stroke and almost no flow.

The Compensator Valve

The compensator is a spring-loaded spool that senses outlet pressure. When pressure climbs to the setting, the spool shifts and directs oil to a control piston that pulls the yoke back toward minimum angle. When pressure drops, the spring wins and the yoke returns toward maximum. This all happens continuously, which is why a healthy PVB holds pressure so steadily.

Where PVB5 and PVB6 Pumps Are Used

Machine Tools

CNC machining centers and lathes use hydraulics for chucks, tool changers and fixtures. These circuits hold pressure for long periods with brief bursts of flow, which is the sweet spot for a pressure-compensated design.

Example: A lathe hydraulic power unit runs a chuck clamp at a set pressure all day. A PVB5 sitting at near-zero displacement while the chuck holds uses only the energy needed to maintain pressure, so the tank runs cooler than it would with a fixed pump and relief valve.

Presses and Clamping Systems

Small presses, injection molding auxiliaries, and workholding systems all benefit from steady pressure and quick response when the load changes.

Mobile and Industrial Equipment

Light mobile equipment, material handling, and test stands also use these pumps, especially where a standard SAE interface and easy parts availability matter.

Installation Best Practices

Most early PVB failures trace back to installation, not manufacturing. Get these right, and you remove the majority of premature failures.

Inlet Line and Priming

• Keep the suction line short, straight, and generously sized to avoid cavitation.
• Keep the inlet vacuum within the limit published for your model.
• Fill the pump housing with clean oil through the case drain port before first start so the rotating group is never run dry.

Case Drain

• Route the case drain line directly to the reservoir, below the fluid level, with minimal restriction.
• Never tee the case drain into a pressurized return line, since back pressure on the case can damage the shaft seal.

Drive Alignment

• Use a flexible coupling and align the motor and pump carefully.
• Avoid side loads on the shaft. Belt drives and rigid couplings shorten bearing and seal life.

Fluid and Filtration

Use a mineral-based anti-wear hydraulic oil within the viscosity range stated in the catalog. For cleanliness, aim for a target in the region of ISO 4406 18/16/13 or cleaner, and confirm the exact recommendation for your model. Particle contamination is the single biggest killer of piston pumps, so good filtration pays for itself.

For more information on the PVB hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: Is the PVB5 a fixed or variable displacement pump?

A1: It is a variable-displacement pump. The compensator adjusts the yoke angle so the pump delivers only the flow the system needs once it reaches its set pressure.

Q2: Why does my PVB pump get hot?

A2: The most common reasons are a compensator set above the relief valve, internal wear causing leakage, or inadequate cooling. Measure case drain flow and compare pump and relief settings first.

Q3: How to purchase a PVB5/PVB6 hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the PVB5/PVB6 hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.A variety of hydraulic solutions are available at https://www.baolilaihydraulic.com/.