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Most regulators claim to be a failsafe design (ie. fail open).

Well all of the literature I can find from manufacturers seems to only apply to their second stages.  I can only find one manufacturer that proudly claims a fail safe design on their first stage  


Anyone come across specific references with regard to first stages.

Daz
 

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You may indeed.

Sorry I'm desperately trying to find the reference to back me up on this (it was quite some time back!)

But basically I found a technical summary on Sherwood 1st stages stating that their 1st stages were the only truly fail safe design on the market.

This may not be true anymore but just interested.

Daz
 

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[b said:
Quote[/b] (Andy the Commie 2 @ Nov. 05 2003,14:36)]& the mares MR 12  ;)
Expand on this Andy....

They are failsafe or they claim to be the only failsafe first stage.?

Daz
 

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as far as first stages go, diaphram 1st stages tend to fail closed (no air) and piston 1st stages fail open(lots & lots of air!) This is nothing to do with cold water freeflows - any reg can suffer this. 1st stage failures that are not temprature related (split diaphram/orings etc) are usually down to bad or no maintanance.
 
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