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Author Topic: How does a tyre pressure guage work?  (Read 2195 times)

Offline Geezer

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How does a tyre pressure guage work?
« on: 15/05/2011 03:56:03 »
How do those telescopic pressure gauges work? If you've ever taken one apart you'll find there is not much to them at all, but they seem to do a pretty good job.


 

Offline JP

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How does a tyre pressure guage work?
« Reply #1 on: 15/05/2011 07:25:13 »
I always thought it had a spring inside of it (I haven't actually cracked one open) so that the spring's force would be equal to the force exerted by the tire's pressure at some point.  Then you just need a scale on it that's calibrated properly...
 

Offline Geezer

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How does a tyre pressure guage work?
« Reply #2 on: 15/05/2011 08:11:38 »
Could be. But you can pull the plunger out and it does not retract.
 

Offline SeanB

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How does a tyre pressure guage work?
« Reply #3 on: 15/05/2011 16:07:39 »
Designed so that the force required to overcome friction in the seal on the rod during extension is very much less than what is required to push it in. Thus the rod extension is proportional to the pressure, via the internal spring, yet it stays in the extended position so that it can be read, you then resetting it by pushing it in. Mostly achieved by having a seal housing that is wedge shaped.
 

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How does a tyre pressure guage work?
« Reply #3 on: 15/05/2011 16:07:39 »

 

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