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Twin

Twin

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Actually they are "überdruckventils" and they were very important in combination with the HES air filtration system. When filtered air was pumped inside these valves would open because of the air pressure getting higher inside than outside. If the filter(s) weren't used the valves would automatically close by their own weight. This way it was impossible for gas to enter the bunker through these valves and still fresh air could circulate. (I'm sorry for bad English, I'm from the Netherlands)
bas
Thu 11-19-2009
Your English is great, and thank you very much for the explanation!
Motts
Thu 11-19-2009
You've taken something old and corroded and turned it into an art work - very nice!
Lynne
Fri 11-20-2009
Fascinating Bas........and with excellent English I should add!
serenityjane
Fri 11-20-2009
thank you for the explanation.
binabinaaa
Sat 11-21-2009
Don't apologize, this is great! Thank you!
Knucklebutter
Mon 11-23-2009
Indeed, great info. I would crack steam trying to imagine what these could be.
Lia
Mon 12-07-2009
God, I love this!

Thank you, Bas, perfect explanation!
Michele L. V.
Sat 01-16-2010
thank you "bas"
oktay oğuz
Thu 05-10-2012

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