Eaton Vickers PVH131 PVH141 variable displacement hydraulic pump

The PVH131 and PVH141 are both pressure-compensated, variable-displacement, axial-piston pumps that utilize a swashplate (in-line) design. Rather than delivering a fixed volume of fluid per revolution, these pumps adjust their output based on the requirements of the system. When the actuators cease movement and system pressure rises, the pump displacement approaches zero, thereby eliminating the generation of excess flow—flow that would otherwise be discharged through a relief valve and converted into heat energy.

How a PVH Variable Displacement Pump Works

The Rotating Group

A drive shaft turns a cylinder barrel holding nine pistons. Slippers on the pistons ride against an angled swashplate (the cradle). As the barrel rotates, pistons stroke in and out. The angle of the swashplate sets the stroke length, and therefore the flow per revolution.

The Pressure Compensator

The compensator is the pump's brain. It senses outlet pressure and moves a control piston that changes the swashplate angle:

• Low system pressure: the swashplate stays at maximum angle and the pump delivers full flow.
• Pressure reaches the compensator setting: the swashplate angle reduces and flow drops to only what is needed to hold pressure and cover leakage.

The practical result is lower heat, lower energy use, and a quieter circuit than a fixed pump paired with a relief valve.

Control Options

PVH pumps are offered with several control styles, depending on series and model code:

• Standard pressure compensator for constant-pressure systems.
• Remote pressure control so a pilot valve sets or unloads pressure.
• Load sensing that matches both pressure and flow to demand.
• Torque or horsepower limiting to protect the prime mover.

Check the model code before ordering. Compensator type is one of the most common sources of wrong-pump purchases.

Key Specifications to Verify

Exact limits depend on the series, fluid and configuration, so use these as a checklist rather than fixed numbers:

• Maximum continuous pressure: commonly in the 280 bar (about 4,000 psi) class for PVH pumps.
• Maximum speed: depends on inlet pressure and fluid, so check the catalog's speed-versus-inlet curve.
• Mounting: SAE flange mounting with SAE splined shafts is typical for this frame.
• Ports: large SAE four-bolt flange ports for inlet and outlet, plus drain and gauge ports.
• Fluids: mineral hydraulic oil is standard, and some design series are suitable for fire-resistant fluids when specified.
• Rotation: clockwise or counterclockwise is set at ordering, so confirm it.

Typical Applications

Injection Molding and Plastics

Large molding machines swing between high-flow clamp movements and long holding phases. A pressure-compensated pump unloads during the hold, cutting heat and energy use.

Presses and Metal Forming

Forging, stamping, and baling presses need fast approach strokes and sustained pressure. A variable pump supplies both without oversized fixed-pump flow.

Machine Tools and Test Rigs

Steady pressure with minimal ripple suits precision work, and the quiet operation helps on shop floors.

Industrial Power Units

Central hydraulic power units serving multiple actuators benefit from a pump that tracks demand instead of running flat out.

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

Specifications

+ In load sensing systems the compensator can be set at 280 bar(4060 psi).

* Industrial Valve Plates are specified in Pump Special Feature'Q250' or'Q140'

△1500 rpm for PVH131/141 only.

□1200 rpm for PVH131/141 only.

◊ Displacements& rated pressure are same as for PVH*** industrial pumps.

Selection Table

Q1: What type of pump is the Eaton Vickers PVH131?

A1: It is a pressure-compensated, variable displacement, swashplate-type axial piston pump for industrial hydraulic systems.

Q2: Why is my PVH pump noisy?

A2: Cavitation and aeration are the usual suspects. Inspect the inlet line, strainer, oil level and fittings before blaming the pump itself.

Q3: How to purchase a PVH131/PVH141 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 PVH131/PVH141 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/.