4 cyl big block oil pumps - internal pressure regulators?

As above, do these pumps have internal regulators for pressure?

Any guidance as to where they're situated, so I can understand what they do?

I've got a couple of old pumps, and one of them is coming apart tomorrow, with a cutter if necessary

 

spring by-pass in body above pick up pipe

 

Jason, was this quote in relation to this thread?

I know nothing about the spring and valve.

Unsure what you mean about "as you know, it's not a pressure issue".

I've never had reason to question any of this

 

I'd have thought all engines have one. The output of a normal oil pump is pretty much linear with engine speed, but the oil demand is not. An oil pump is designed to pump just enough oil at idle to maintain required pressure, any more and the losses at high rpm are greater. As the rpm rise the pressure rises almost linearly, till it reaches the presure of the PRV, which then opens. The pressure then rises slowly with rpm as flow is restricted by the valve.

I have seen an engine benefit from having the PRV outlet piped to below the baffle, since such a lot of oil is re-circulated through it at high rpms.

 

Think I was carrying over in my head some of the related issues re the baffling in the other threads Chris... but the spring and valve bit relates to crispy's posting.

 

I've had a good look at a few pumps now - but can't see where the PRV releases pressure to!