Axial Piston Pump or Vane Pump?

What is the fluid, its temperature and pressure?

Hydraulic oil : POLYOL ESTER

Temperature: 40 to 60deg.

Pressure: 140 Bar

Application: Steel plant

What are you trying to use it for?

Contamination levels?

Either would work at that pressure... do you need variable displacement? what are your controls?

Typically, If it will be used for driving something, or you need precise control of a cylinder/motor, high pressures, I'd go with piston.

I generally use vane/gear pumps as recirc pumps, They are easier to rebuild, cheaper initially and in the long run. However vane/gear pumps can be rather limited.

When choosing components for hydraulic applications, much care needs to be taken to assure you'll get exactly what you need, and not something that can work. The "big picture" must be taken in if proper components are to be selected.

Both vane and piston pumps are very contamination sensitive, and will fail catastrophically, while gear pumps generally can eat quite a bit before they die slowly. Something to think about in a steel mill. How clean is your fluid? ISO count?

I'd like to add to the reply,

Piston Pump (aka Reciprocating/positive displacement pump) is fine to use when supply of fluid is not consistent i.e. presence of bubbles or vacuum in the supply line. Vane Pumps won't work with bubbles, the supply should not be disrupted.

Another thing, if the fluid is more viscous and has heavy particles in it, vane pump (centrifugal pump) is better. Piston pumps wear out too quick in such working condition.

Just to add a bit... NO HYDRAULIC PUMP should ever be subject to running with bubbles, it will wipe out every (hydraulic) pump ever made, cavitation, air bubbles, contamination, improper fluid type etc etc... hydraulic pumps need to be chosen correctly in the beginning if you want any of them to last.

I too have found vane pumps to be the most durable and economical. I have used them in a fleet of 100+ portable axial flow pumps for the last 20 years. Anything at all goes wrong and a piston pump destroys itself. Gear pumps are good but only last half as long as a vane pump. Put a group of magnets where they can gather ferritic particles and use a liberal oil tank size and a cooler if it is needed. Since I am driving vane motors I have the "air space" in the tank flooded with helium (cheap and easy) and the vent is coupled to a plastic bag at 2x Boyles law sizing plus the alarm cut off for low oil level. I use environmentally safe fluids and this stops any exposure, oxidation or, condensation/addition of water or dust to the oil by the atmosheric venting.

very good.

Vane pumps tend to work best in a foundry environment, but it also depends what you need for control. Whatever you do, don't skimp on filters including the tank breathers. Keep a good eye on oil contamination with dirt/dust.

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