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Espresso: Espresso Mods and Restorations
Thread at the bottom of standard Silvia portafilter?

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PJK
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Joined: 21 Jan 2002
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Location: Folsom CA
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Espresso: Rancillo Silvia, Tonic...
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Posted Tue Oct 14, 2008, 6:44pm Subject: Thread at the bottom of standard Silvia portafilter?

Since I got my bottomless handle my standard handle just serves as a holder for my blind filter. I would like to replace the spouts with a pressure gauge. I don't imagine the thread is NPT. What sort of adapter do I need to get to NPT so I can attach the gauge? Thanks, Phil

Philip J. Keleshian

JeepinGeo
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Joined: 5 Dec 2007
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Location: Campbell, CA
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Espresso: Alex Doppia Caldaia, Silvia
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Posted Tue Oct 14, 2008, 7:51pm
Subject: Re: Thread at the bottom of standard Silvia portafilter?

PJK Said:

Since I got my bottomless handle my standard handle just serves as a holder for my blind filter.

I would like to replace the spouts with a pressure gauge. I don't imagine the thread is NPT. What sort of adapter do I need to get to NPT so I can attach the gauge?

Thanks,

Phil

Posted October 14, 2008 link

Phil,

3/8 NPT will work fine. The PF is not NPT, likely BSPT, but a little teflon tape will make the connection perfectly leak free.

George

(Click for larger image)

PJK
Senior Member

Posted Tue Oct 14, 2008, 9:29pm Subject: Re: Thread at the bottom of standard Silvia portafilter?

Thanks George, I'll get the gauge and the 3/8" elbow and give it a try. Phil JeepinGeo Said: Phil, 3/8 NPT will work fine. The PF is not NPT, likely BSPT, but a little teflon tape will make the connection perfectly leak free. George Posted October 14, 2008 link

Philip J. Keleshian

PJK
Senior Member

Posted Tue Oct 14, 2008, 9:35pm Subject: Re: Thread at the bottom of standard Silvia portafilter?

I just thought - I can just leave my single basket in the handle and see my pressure every time I back flush. Phil

Philip J. Keleshian

stefano65
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Joined: 30 Oct 2004
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Location: Eugene OR
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Posted Wed Oct 15, 2008, 1:30pm Subject: Re: Thread at the bottom of standard Silvia portafilter?

No basket 3/8 BSPT

Stefano Cremonesi info@espressocare.com www.espressocare.com

JeepinGeo
Senior Member

Joined: 5 Dec 2007
Posts: 113
Location: Campbell, CA
Expertise: I love coffee

Espresso: Alex Doppia Caldaia, Silvia
Grinder: Mazzer SJ (x2), Rocky DL

Posted Wed Oct 15, 2008, 1:47pm
Subject: Re: Thread at the bottom of standard Silvia portafilter?

PJK Said:

Thanks George,

I'll get the gauge and the 3/8" elbow and give it a try.

Phil

Posted October 14, 2008 link

You're welcome!

Some more details on the PF gauge I made:

The gauge is 1/4 NPT male. It goes into a 1/4 NPT Fem to 3/8 NPT male adapter bushing. Then into the 3/8 NPT Fem/Fem 90 elbow. The button head screw in the side is capping off the 10-32 hole I drilled/tapped for a flow control.

George

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