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Anti Vac Valve hiss
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OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Sat May 24, 2014, 10:12am
Subject: Anti Vac Valve hiss
 

How long should the anti-vac valve hiss after first starting up the machine?  I installed one on my Oscar and the thing hissed and sputtered nonstop.
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CoffeeRon
Senior Member


Joined: 26 Apr 2009
Posts: 757
Location: Eatonville, Wa
Expertise: I love coffee

Espresso: Wega Lyra, Europiccola(still...
Grinder: Macap M7D, Pharos, Vario W,...
Vac Pot: Sunbeam CoffeeMaster
Drip: Melita BCM-4
Roaster: FR SR500,B-1600, SC/TO
Posted Sat May 24, 2014, 5:08pm
Subject: Re: Anti Vac Valve hiss
 

It should start to hiss as the water starts putting off some steam- like a low simmer stage, and stop within a minute or so roughly. when it's cold you should be able to wiggle the pin around freely and if you can get ahold of it pull it up slightly. If something got lodged in it during assembly this might free it up. If not you can take the upper part off and clean up the parts, just don't lose any washers/seals.
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OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Sun May 25, 2014, 6:45am
Subject: Re: Anti Vac Valve hiss
 

I have the whole machine apart right now.  I removed my brand spanking new safety valve and the darn thing fell apart!  Could that be why the anti-vac valve kept sputtering?
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skydragondave
Senior Member


Joined: 18 Feb 2013
Posts: 167
Location: Ontario, Canada
Expertise: Professional

Espresso: Commercial Only
Grinder: Commercial Only
Roaster: Has Garanti HG5
Posted Sun May 25, 2014, 7:14am
Subject: Re: Anti Vac Valve hiss
 

It's possible a piece of teflon tape squirmed out of the threads while it was being tightened down and then got blown back up through the o-ring seat. The safety valve must be removed using the wrenching flat closest to the base, otherwise it will come apart. Now it will have to be re-calibrated. If you go to the hardware store and pick up a pressure regulator with gauge, you can screw the valve into that and adjust it to open at 20-25PSI, then lock it down again. Use the bottom wrenching flats to install it or you'll lose the adjustment.
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