Did altitude just blow out 2 MPS's?, Put the in my checked baggage...now won't hold vac. Options

[wonkipop]

@Superhawk996

yeah you are right. i used his pressure difference/expansion rate and did my own calc on 10,000 ft of altitude. all you get is 2.5mm expansion of barometric cells. max.
probably be less given cabin pressure is more like 8000 ft. its 9.34 inches of mercury difference sea level to 10,000 feet. thats the maths anyway.

i've only just managed to find a cross section of one of these things to get my head around it. i need drwgs to understand anything. (IMG:style_emoticons/default/biggrin.gif)

looks to me like the most this thing can do with its diaphram is move between partial load stop and full load stop no matter what the barometric cell does? can't overextend if the drawing is right. would just compress the spring at the bottom of it all?

well maybe most plausible cause it got shock jolted.
i noticed dr. d jet when i read his blurb said whatever you do don't jolt or shock one or blow air in it. (IMG:style_emoticons/default/smile.gif)

glad i got an L jet.

[wonkipop]

Google this:

Does an aneroid cell expand when ambient pressure drops?

yes. (IMG:style_emoticons/default/biggrin.gif)
its just more or less a barometer in that little device. right.

i guess if it got weakened over time it could overexpand since its really relying on the springing nature of the metal to do that expansion. its reacting purely to atmopsheric pressure around it. the vacuum in it is simply balancing spring tension of metal against vacuum to hold a form and shape.

but looking at the drawings of an MPS now which is helpful to a kook like me,
i can't now see how if it overexpanded it could drive the upper diaphram to breaking point due to the stops limiting travel in the two directions it can go in before it hits the stops. very hard for me to now see how it can push it too far. unless somehow it got a twist in it as it overexpanded that meant it could drive the diaphram up at an angle off axis. there would be evidence of that as the cell would have distorted quite a bit?