temperature change and pressure rise gradiant for a PRV

[cannondale]

I'm looking for some help.
To calculate the temperature change of a fluid (water for example), when its pressurised to 345bar from atmosphere or 3bar maybe, and then what the temperature change would be when brought back to atmosphere again.
Pressure rise gradient for a closed valve condition for a reciprocating positive displacement pump. I'm assuming it'll be the same the gradient of the calculated pulsation frequency of the pump, but with some damping effect based on the bulk modulus, and volume/ length of pipe between the pump and the valve?
This is all to evaluate a pressure relief valves response to a change in pressure.

Any help much appreciated, as this is outside my field of knowledge. I'm learning but I'm kind of stuck right now.

 

[LittleInch]

Please don't double post - it is not allowed and gets people annoyed.

Everyone else see

http://www.eng-tips.com/viewthread.cfm?qid=381881

if you're interested.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[cannondale]

apologies, though maybe id hit different disciplines. Thanks for the help though