Tube pressure's

midlander · 29 October 2012, 11:02

hi, still being a newbie, might seem a daft question and prob covered before ( but i can not find it ), Just got a set of tubes with PRV's fitted, in the past i have always been worried about over pressuring the tubes and causing damage, SO the question is now i have PRV's, do i just inflate till they blow off and then let them settle down by themselves ? assuming that they will close once they get down to the pressure rating they are.

thomas · 29 October 2012, 11:20

I wouldn't, fill it to the correct pressure, hyperlon tubes tend to be about 3psi and release valves are set to go off at 4 so you'd be over filling them.

paul tilley · 29 October 2012, 13:50

thomas i think you have been misinformed ,pressure relief valves can be anything from 1 to 12psi for rib tubes the norm being 2.7psi (white dot in centre of valve ) or 3.2 psi (orange dot ) there is also a +/- factor . The mod always used to paint working pressure 1.5psi max 2psi on there tubes .2psi is actually quite a hard pressure .we use 2.75psi valves .

midlander · 29 October 2012, 15:35

I have the white dot 2.7psi PRV's, so am i right mr Tilley in inflating till they "blow" and that the tubes will be spot on ? i ask because i don't want to damage the tubes, i also know that they are designed to release the pressure when it is sunny and the air expands, so i am using the same logic, fill to blow off point, and they will be sound, and if we ever see warm sunny weather they will again release the pressure when the air expands.

thomas · 29 October 2012, 15:54

I was repeating what I was told on here, I think it was rib craft that had 4psi valves

My manual says 3.4 psi, I've never gone over 2.

paul tilley · 29 October 2012, 16:46

we only blow up to release pressure when testing tubes and then we put plugs in the p/r valves to over pressure .you dont need to blow up to release pressure