PCP Regulator Failure

[Robert_Lavin]

Slightly techy question for a Friday afternoon.

What's the mechanism of failure that causes a regulator to stop regulating?

Given that it's just some springs, seals and a diaphragm(?) I'm struggling to work out what goes wrong.

Anyone have any expertise they can share?

Thank you.

[AdeC]

Usually the seals

[Neil54]

Turning a regulator down whilst under pressure damages the springs.
The seat can become worn.

O rings of course.

[angrybear]

Unnecessary lube gumming up with dirt & debris, or the springs failing having been driven too hard,
but as said above O rings are most likely

[rapidresponse1]

id say the 0 rings

[deejayuu]

Synthetic valve seat as Huma, Uragan, etc deforms under pressure from metal valve nipple. Got photos if it helps.