In F225, what is a PRV aka Poppet?

[HMBJack]

I see discussion of a PRV or pressure relief valve aka a "poppet".

Where is this on the F200, F225, F250? Ideally, what PN is it?

And do you recommned it be changed at what ___ hours?

Never heard of this hence my question. Thank-you in advance for your guidance.

[HMBJack]

Thank-you.

Do you know where these parts are in the pull down menu of the on-line parts catalog? i.e. the PRV and spring, gasket, etc.

I'm trying to locate what PN's I need for this (my engine has 315 hours so I'd like to replace the PRV).

[HMBJack]

Plate shows manufactured in April 2005. Model F225TXR

I have at least located where the PCV is in my shop manual - page 7-10 so I'm getting close...

[HMBJack]

Found it - it appears to be PN 69J-11371-00-00. If this fails - what happens? Over heat? Under heat? And, what makes them fail? Saltwater corrosion? Spring wear? Curious...