over-under pressure relief valve

[philip de moor]

I am looking for a high capacity air pressure equalisation valve for a freezer tunnel.
Nowhere I can find such a valve, has anybody experience with this?

[Peter_1]

What capacity do you need? Why not mount more little ones?
Is much safer (in case of failure of one big valve)

We always use those of Fermod
(Vanderbeke - Kuurne 056-35.88.31)

http://www.fermod.com/pagese/panprod.htm

Peter

[philip de moor]

after calculation I need 14 smaller Fermod valves!

[Andy]

Hi Philip
if this is a coldstore the fermod relief valves will be fine. But if you are blast freezing I would sugest making you own relief valves as the amount of these valves required would be just silly.
make up a heated frame and fit this to the freezer wall, with a rubber flap that can be sucked inwards, once the pressure is equalized the flap will self seal. Also I would advise starting the fans in stages to minimise the chance of pulling down the ceiling.
Kind Regards. Andy.