Cavitation in Hydraulic Pumps

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Hydraulic Cavitation

In order to have a hydraulic system working properly, it is necessary to feed the Glossary Link pump with 100% liquid Glossary Link fluid, without anything else.

Glossary Link Cavitation occurs when a liquid fluid is vaporized because excessive Glossary Link vacuum. In general, the place that meets this condition is the suction of the hydraulic pump.

 

When the fluid vaporizes in the suction of the pump, the amount of fluid vapor varies depending on how high is the vacuum generated, therefore the output Glossary Link flow is going to be affected.

Additionally, the bubbles of vapor that are formed in the suction, once are directed to the outlet where there is Glossary Link pressure, collapse violently causing erosion in the surrounding metal walls inside the pump. This process affects the life of the pump dramatically.


 

This is what happens with the oil vapor bubbles inside the pump during the transition from negative pressure in the suction side to high pressure at the outlet creating noise and erosion.

 

The rapid contraction is so strong that a heavy Glossary Link force is generated against the closest surface. If this phenomena occurs for a long period of time, the damage caused will be irreversible and can cause catastrophic failures.

Cavitation Erosion

 

Probable causes for cavitation on hydraulic pumps:

A. Clogged or restricted suction in the pump.

B. Clogged or restricted Glossary Link strainer.

C. Pump too far from tank.

D. Pump too high above tank.

E. Suction pipe or hose diameter too small or too many elbows or reductions.

F. High Glossary Link viscosity of the oil, temperature too low or wrong oil.

G. Excessive RPM on the pump.

H. Oil mixed with water, kerosene, fuel or solvents, at high temperature.

 

 


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