Week #14: (4/23-27) Directional Valves, Cavitation

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rjagodowski
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Joined: Fri Sep 04, 2015 6:59 pm

Week #14: (4/23-27) Directional Valves, Cavitation

Post by rjagodowski »

Hydraulic Directional Control Valves

Normally Open vs. Normally Closed Valves

Cavitation

Related to cavitation, Water Boiling in a Vacuum Chamber.

NOT completely related to cavitation, Peeps in a Vacuum Chamber. On the shaving cream demo, notice that when atmospheric pressure is restored (a high pressure compared to the vacuum) the small bubbles of air collapse violently, an implosion, which is rather forceful (for shaving cream). The same happens when the bubbles created under cavitation implode against the impeller and pump mechanism. This can lead to rapid pump failure. On of the purposes of the normally closed relief valve in a hydraulic system is to provide a path of fluid flow when back pressure gets too high in the system. This allows the fluid to return to the cooler reservoir rather than become rapidly heated in the high pressure condition. As was mentioned, when the fluid heats up, cavitation is more likely to occur.
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