Oil system layouts
Oil system layouts
(OP)
I've realised recently, that the typical oil system layout goes:
Oil pump -> Pressure relief valve -> Oil filter -> Engine
Not sure why, but I always assumed (incorrectly it seems) that the Pressure relief valve (PRV) came after the filter. Seemed to me that the filter pressure drop may vary depending on the contamination level, therefore oil pressure itself could vary. I know some filters have a bypass to help this? Anyway, what's the advantage to having the PRV before the filter? And what could go wrong with the alternative, PRV after the filter?
Thanks, Ian
Oil pump -> Pressure relief valve -> Oil filter -> Engine
Not sure why, but I always assumed (incorrectly it seems) that the Pressure relief valve (PRV) came after the filter. Seemed to me that the filter pressure drop may vary depending on the contamination level, therefore oil pressure itself could vary. I know some filters have a bypass to help this? Anyway, what's the advantage to having the PRV before the filter? And what could go wrong with the alternative, PRV after the filter?
Thanks, Ian





RE: Oil system layouts
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Oil system layouts
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Oil system layouts
Carlos Reis
RE: Oil system layouts
Regarding the pressure drop across the filter then, I assume this will increase with contamination effects, until it becomes sufficient to open the filter bypass valve?
Engine oil pressure will therefore drop slightly from a new filter down to the filter bypass opening, and remain constant thereafter?
Thanks, Ian
RE: Oil system layouts
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.