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Extreme overclocking Refill your dewar here.

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Old 03-14-2015, 17:18
barbonenet barbonenet is offline
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Default [How To] Renewal Dewar Vacum

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 Loctite 243


1x Brass Acces Valve (1/4sae-1/4sae) or (1/4sae-7/16"-20) http://ph.parker.com/us/17054/en/ref...alves/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!!!!!!
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Last edited by barbonenet; 03-15-2015 at 16:30.
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Old 03-14-2015, 17:18
barbonenet barbonenet is offline
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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


Ok the main work is done!

-Now put on your valve Loctite 243 (here i use Teflon, but Loctite 243 it's better)


...screw up it (here i use Teflon, but Loctite 243 it's better)


-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 !!!!!!
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Last edited by barbonenet; 03-15-2015 at 16:32.
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Old 03-14-2015, 17:19
barbonenet barbonenet is offline
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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.
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Last edited by barbonenet; 03-14-2015 at 20:51.
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Old 03-14-2015, 19:03
Sergio73 Sergio73 is offline
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WOW!!!! Nice work !!!
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Old 03-14-2015, 19:08
barbonenet barbonenet is offline
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Thanks
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Last edited by barbonenet; 03-14-2015 at 21:03.
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  #6  
Old 03-14-2015, 21:42
dRweEz dRweEz is offline
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Thanks, great info
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Old 03-14-2015, 23:20
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der8auer der8auer is online now
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Amazing stuff. Great work!
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Old 03-15-2015, 00:03
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awesome stuff man
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Old 03-15-2015, 14:32
nachtfalke nachtfalke is offline
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nice work!! i recomanded to change teflon with threadlocker LOCTITE 243( medium strenght)
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Old 03-15-2015, 14:58
ogblaz ogblaz is offline
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Hi, great guide my friend, I did this a week ago and my dewars now evap rate is much better than before, I lost 10L in three days now its less than a liter per day. Its bad, but I think this is normal for my type of dewar.
I took the plug out of the dewar, the vaccum was present but was bad, then i go and bought the 1\4 valve like you told me, took the plug and the valve to a guy with the mill and he made threads on the plug and the valve, i used locktite "rope", bought a new oring, and used silicone grease on the plug. In original is high vaccum grease, but its 30€ i dont think it makes much diference.




Thanks again for all your help!
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