Severe Service Control Valve

There´s no ISA or IEC standard defining severe services for control valves.

A valve enters into this category when dealing with a fluid condition that requires special attention when specifying and sizing the valve body and actuator. Among these conditions are:

High temperature (above 427 C)

High pressure (above 600#)

Flashing, cavitation and noise level above 90 dBA

Corrosive and erosive fluids

Cryogenic applications (below -100C)

High dPs

Sometimes the valve can experience more than one of the above situation like cavitation and erosive fluid. Extra precaution is required then.

I personally reccomend you to consult your favorite manufacturer to discuss which valve and materials are best suited when a severe service application arises.

Good luck

David Rodrigues

Jeetu

Cavitation and cavitation damage depends on dP drop and many other factors including valve type, time of exposure, vapor pressure x temperature and material properties.

No one can really say when dP pressure is too high or low. It depends on what kind of application the valve is being used.

The real question is "in what condition will the valve cavitate?" Some valve sizing software will tell you when your valve is submitted to incipient or damage cavitation. Suggest you to download ValSpeQ software from Masoneilan website. It´s free and easy to use.

Also suggest consulting following literature for further information. You can find through Google:

Control valve cavitation damage control

Masoneilan Control Valve Sizing Handbook

Control Valve Handbook, 4th edition, Emerson/Fisher.

Best regards

David L V Rodrigues