Fluid Power Journal

When to Replace a Pump

A frequent question in fluid power is “When should I replace my pump?” The answer is “It depends.” It depends on a multitude of factors, conditions, …

Vacuum Valves

Click images to enlarge The most common form of vacuum generation is a vacuum venturi, often referred to as a “vacuum pump.” This can be misleading because …

Pump or Venturi?

When a salesperson is quoting a vacuum installation, a common question to the end user is, “Would you prefer a vacuum pump or venturi?” More often …

Mid-Pressure Range Pump

The V40M axial piston pump has been designed for open circuits in mobile machines and has a displacement volume of 2.75 in.3/rev. Its swash plate design allows …

Energy-Efficient Hydraulics: Variable Frequency Drives as Pump Prime Movers

It is obvious what we want to achieve with variable speed pumps: to save energy and reduce noise and possibly increase the power density of hydraulics. To …

Analysis of a Hydraulic Oil Failure

I recently conducted failure analysis and a reliability audit on a 300-kilowatt (400-hp) hydrostatic transmission. This hydraulic system was running a …

Spur Gear Pump Displacement

So you need to replace an unlabeled external gear pump originally sold by Cro-Magnon Hydraulics during the First Crusades, and sadly you have no idea of the …

Advanced Pump Control for Energy Savings in Intermittent Hydraulic Systems

Many hydraulic systems are only required to deliver flow at pressure during certain stages in a machine cycle. This is even more prevalent in the theme park …

Hydraulic Pumps and Motors: Considering Efficiency

In a condition-based maintenance environment, the decision to change out a hydraulic pump or motor is usually based on either remaining bearing life or …

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