Posted Sat May 24, 2014, 6:08pm 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.
skydragondave Senior Member Joined: 18 Feb 2013 Posts: 168 Location: Ontario, Canada Expertise: Professional
Espresso: Commercial Only Grinder: Commercial Only Roaster: Has Garanti HG5
Posted Sun May 25, 2014, 8:14am 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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