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Hydraulic pumps are an incredibly important component within hydraulic systems. IFP Automation offers a variety of pump and hydraulic system products that deliver exceptional functionality and durability. Our partner Parker’s extensive line of hydraulic pumps deliver ideal performance in even the most demanding industrial and mobile applications. In this post, we are going to spend time discussing pressure compensated and load sensing hydraulic pumps.

Do to the surface area of the servo piston and the pressure exerted on that area, a force is generated that pushes the swash plate of the pump to a lower degree of stroke angle.

The pump tries to maintain compensator setting pressure, and will provide whatever flow (up to it’s maximum flow rate) that is necessary to reach that pressure setting.

For more information on how you can make use of hydraulic pump technology in your applications, please contact us here to receive a personalized contact by an IFP Application Engineer:

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***REMAN*** Pressure-Flow Compensated Piston Pump; FITS: 1086, 1486, 1586, 3388, 3488, 3588, 3688, 3788, 6388, 6588, 6788, 986, Hydro 186; SUB: 1255005C97, 1263450C91, 1263450C92; ***Can be converted to a gear pump see 830456 & 830457

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The Eaton hydraulic pump portfolio also contains includes products known under the brand names of DuraForce, Hydrokraft and Vickers. The range includes:

DuraForce® HPR Series: These pumps have displacements from 55 cc to 280 cc at operating pressures up to 420 bar (6100 psi). Eaton DuraForce HPR Series pumps also have a flexible, modular design meaning they can be directly interchanged across many applications.

DuraForce® HPV Series: Durable axial piston pumps available with displacements from 55 cc to 280 cc at operating pressures up to 420 bar (6,100 psi). These Eaton hydraulic pumps have a modular, efficient and cost-effective design.

Hydrokraft PVW & PFW: Eaton PVW and PFW pumps are manufactured for primary metals power units, marine cranes, thrusters and more. They include variable or fixed displacements from 130 cc to 750 cc at operating pressures up to 350 bar (5,075 psi).

Hydrokraft PVX & PFX: With fixed and variable displacements, Eaton PVX & PFX Series piston pumps have a robust housing enclosure. Displacements range from 66 cc to 250 cc at operating pressures up to 350 bar (5,075 psi).

Eaton Vickers PVB Series: These pumps are suitable for smaller open-circuit applications. Eaton PVB piston pumps are available with variable  displacements from 10 to 94 cc and operating pressures up to 210 bar (3,045 psi).

PVH Series: Eaton Vickers PVH Series piston pumps are suitable for mid-range applications in displacements from 57 to 141 cc at operating pressures up to 250 bar (3,625 psi). A comprehensive range of control options, includes torque-limiting abilities.

PVM Series: With displacements from 18 cc to 141 cc at operating pressures up to 315 bar (4,500 psi), the Eaton PVM Series piston pump decreases noise emissions by more than 50% for silent, efficient operation.

Eaton Vickers PVQ Series: With minimal operating pressure and reduced variable displacement, Eaton PVQ Series piston pumps are a versatile option for machine tools, small presses and shears, conveyor lines and more. Displacements range from 10 cc to 45 cc at operating pressures up to 210 bar (3,045 psi).

Eaton MD PFC Series: The Eaton Medium Duty Pressure or Pressure-Flow Compensated (MD-PFC) piston pump series is for applications that need lightweight design, lower displacements and configuration abilities.

PVH Series: The Eaton PVH Series manages up to 250 bar (3,625 psi), high flow, continual duty operations on mobile equipment. These pumps are ideal for applications that require skid steer loaders, boom lifts and more.

PVE Series: Eaton Vickers PVE Series pumps are suitable for unsupported PTO drive applications and use a die-cast housing to lower weight. Options include pressure compensation, pressure and flow compensation, and remote pressure control.

TVW Variable: Eaton developed Hydrokraft TVW Series variable closed-circuit piston pumps are for industrial applications. Displacements range from 130 cc to 750 cc at operating pressures up to 350 bar (5,076 psi). The TVW Series also features a through-drive design, an integrated HST circuit and a wide range of controls to aid installation and usage flexibility.

TVX Variable: The precise controllers of Eaton TVX Series variable closed-circuit piston pumps provide added efficiency in crusher feeder drives, de-watering presses, cranes and more. Variable displacements range from 66 cc to 90 cc at operating pressures up to 350 bar (5,076 psi).

Eaton V Series: Incorporating an intra-vane cartridge design, Eaton V Series hydraulic pumps provide long operating life, great volumetric efficiency and excellent serviceability. They are suited to indoor applications because of their extremely quiet 12-vane system.

Eaton Vickers V10 and V20: These fixed displacement vane pumps are used for medium- to low-pressure mobile and industrial applications. They are available with integrated flow control valves to simplify system design and installation.

VQ(H): Eaton VQ and VQH Series fixed displacement vane pumps have an intra-vane cartridge design, providing long operating life and outstanding volumetric efficiency. These 10-vane systems have a solid architecture and many available bearing and valve options. The Eaton VQH series offers higher pressures and performance because of its rotor design. This reduces leakage and enhances rotor rigidity. VQH Series pumps also use a strong, ductile iron housing with the same envelope size as VQ Series pumps for more flexible integration.

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Watkinsville, Ga.I would like an explanation of the differences between a closed center load sensing hydraulic system and a closed center, pressure and flow compensated hydraulic system. For applications such as running hydraulic pumps (planter, sprayer, etc.) is one type of system better than the other. For operating hydraulic pumps, 3 pt. hitch, and auto-guidance (planting); is one system "better" than the other? Under what conditions would PFC be more desirable than load sensing?

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Here is the verbage of the bulletin that Cedar Farm referenced. Explains it pretty well. As far as comparing the capacity/ability of the PPH system to the hydraulic capacity/capabilities of today"s tractors....don"t get your expectations too high. Its really comparing apples to oranges. Back then, most hydraulic motors were simple gear motor setups that didn"t need a lot of pressure to operate...didn"t take much power and didn"t create a lot of heat. Today"s hydraulic motors are usually of axial-piston design which take more pressure to operate and create more heat...although their overall efficiency is much higher. The hydraulic cooling capacity on tractors with PPH systems was much less capacity that what today"s tractors offer. The PPH system allowed a transition away from open center hydraulics to modern closed-center hydraulics, but closed-center load-sensing hydraulics were still in their infancy at that time...we"ve come a long way since then.

To give you an idea about this, a Cyclo planter hydraulic motor took 7-8 GPM to operate the blower fan. IH(and later CaseIH) did NOT recommend using a PPH-equipped tractor to run the Cyclo system directly off the tractor"s hydraulics due to limitations of the PPH system.