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What is meant by cavitations in control valve?

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Question ajoutée par ahmed ali abd elhamed , electrical engineer , sanita Industry
Date de publication: 2013/10/10
حسام ناجى
par حسام ناجى , testing and commissioning engineer II , SENDAN INTERNATIONAL COMPANY

When a liquid enters a valve and the static pressure at the vena contractadrops to less than the fluid vapor pressure and the recovering to above fluid vapourpressure, this pressure recovery causes an implosion or collapse of the vapourbubbles formed at the vena contracta. This condition is called cavitation.

Himadri Roy
par Himadri Roy , MANAGER ELECTRICAL , STEAG ENERGY SERVICES

Formation of bubbles & colapsing of bubbles due to loss of NPSH( Net Posative Suctio Head) inside the pump/valves produces resonance/ enormous stress, if it continue for alonger time it may rapture the valves or pump is known as cavitation.

Amr Saleh
par Amr Saleh , Senior I&C technical office engineer , ENPPI

the internal part wear out of bubbles and force of water gradually !!!

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