Guida - Rinnovare Vuoto Dewar

[BarboneNet]

All this material need to apply Brass Acces Valve (1/4sae-1/4sae) or (1/4sae-7/16"-20) !!!!
If you didn't find this valve, Drill Bit & TAP size to use, change!!!!!!

What you Need

1x 2Stage Vacum Pump (ebay)


1x TAP 7-16"-20 UNF (ebay)


2x O-Ring (better if you find O-Ring for Low Temp)


1x Teflon


1x Brass Acces Valve (1/4sae-1/4sae) or (1/4sae-7/16"-20) http://ph.parker.com/us/17054/en/refrig ... s/avu1f1-4


1x Drill Bit 9.5mm for Steel


All this material need to apply Brass Acces Valve (1/4sae-1/4sae) or (1/4sae-7/16"-20) !!!!
If you didn't find this valve, Drill Bit & TAP size to use, change!!!!!!

[BarboneNet]

First at all, search the correct Brass Access Valve....if you find Valve like post#1, you can go to next step!

DEWAR CAP MOD

-Remove cover cap of dewar. you can help with a screw



-Now make an hole of 9,5mm with Drill, and then make thread with 7/16"-20 TAP (Attenction: Stay perpendicular and use OIL)



this is a good job :D


Ok the main work is done!

-Now put on your valve Teflon...


...a lot of teflon and screw up it


-change O-Ring and mount this modded Cap on Dewar (use a littlebit of grease on O-ring)


put the second O-ring like me


push push


F I N I S H !!!!!!

[BarboneNet]

Renew Vacum

Attach 2Stage Vacum Pump to your Dewar, and start up vacum!


Do vacum for 30minutes.....


then turnoff pump, and check vacum after 1-2hour.....



if dewar doesn't lost vacum, turn on again Vacum pump and remove quickly the tube from dewar!!!
Turn off pump and screw up the valve caps!!!!

Finish !!!!

Tips:
-For a better performance, warm up dewar before making vacum!!!
-If dewar lost vacum, try to put more teflon on valve......
-if you know a Mechanic, you can ask if he can do vacum with his Vacum Pump (with his recharger for air conditioning).

Ask here if you need help.

[BarboneNet]

ok....domani la ritraduco:D

[coccus80]

Ottimo seguo con interesse anche perchè ho in casa un dewar da 20lt che devo rinnovarlo, al massimo se non riesco te lo spedisco.

[BarboneNet]

Ci devi riuscire.....il 29 sono in volo