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Old   January 12, 2009, 00:37
Default Pressure relief valve
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We are doing some testing on pressure relief valve for pressurized oil. Our test engineer reported the heating of the PRV during operation. I am surprised since there should be cooling during the release of the pressurized oil. As the process is very fast and we assume it is adiabatic it is a case of adiabatic cooling. Isn't it?

Your explanation will help me to understand the process.

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Old   January 12, 2009, 08:40
Default Re: Pressure relief valve
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I assume the pressurized oil is (almost) incompressible. So there is no real cooling as with a compressible gas undergoing an adiabatic expansion. When the oil contains dissolved gas which is released during depressurization this will have a slight cooling effect. But when dealing with an incompressible fluid you will get heating due to friction.
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Old   January 13, 2009, 00:06
Default Re: Pressure relief valve
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Thanks Bart for the explanation. I will dig into it further.
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