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The Brewing Forum • View topic - How To . . . Make A Rotating Racking Arm For A Conical FV

How To . . . Make A Rotating Racking Arm For A Conical FV

If you know how to do something, and how it should be done, tell us here.

How To . . . Make A Rotating Racking Arm For A Conical FV

Postby Aleman » Thu Apr 24, 2014 19:43

I fitted a rotating Racking Arm to Connor today. Here are the bits in the order they will assemble . . . inside on the left.

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First off fit the long 1/2" BSP nipple into the ball valve and tighten it as far as it will go, then wind PTFE tape around the nipple where the body of the Ball Valve ends . . .

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Screw the brass flange nut onto the nipple right down so that it tightens onto the tape before the ball valve

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Then remove the nipple, without moving the flange nut.

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Wind on more PTFE tape to the end of the nipple

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And tighten it back onto the Ball valve

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Fit a silicon O Ring to seal the wall and the flange nut . . . there is no leak path past the Flange Nut as we took care of that with the PTFE Tape.

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This shows the full assembly of the Racking Arm the vessel wall is sealed between the PTFE washer, and the Silicon O Ring. I'm using a 15mm Brass Compression nut temporarily to hold the racking arm (Courtesy of Nick - Muddy Disco) in place on the end of the nipple. I will replace it with a stainless one but they are a little bit expensive.

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The hole in the wall of the conical is 20mm, and is just slightly smaller than required clearance for the nipple . . . but being plastic the nipple will cut its own thread as it is screwed in . .. the O ring seals between the conical wall and the flange nut.

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Inside First fit a PTFE washer (another engineering fit ) thanks to JamesB for that one, as it will allow the racking arm to rotate much more freely that just using another O Ring.

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Follow that up with a M20 Form B Stainless Washer from Stig's Stainless Supplies

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Which allows us to tighten up the 1/2" BSP Stainless Half Nut to seal everything together

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The Racking Arm is fitted and tightened in place . . . then the Arm is aligned with the arm of the Ball valve . . this allows us to know what the position of the arm is when it is full of beer. . . . here they are in a horizontal position.

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And following rotation to the vertical downward position

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Looking forward to using this now.
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Aleman
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