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BlowTie Diaphragm Spunding Valve Complete Kit

BlowTie Diaphragm Spunding Valve Complete Kit

In Stock
60 day no hassle return policy. Details

With this complete kit you'll be ready to use the Blow Tie Spunding Valve right out of the box. The BlowTie is used to release excess pressure on a pressurized fermenter or from a receiving keg during pressure transfers. This diaphragm spunding valve is much more accurate than the spring and poppet style, and works much better at lower pressures.
Pressure Fermentation
Pressure fermentation is becoming more and more popular at the homebrew level, but in order to do it safely and accurately, you need a way to release excess pressure. You'll pressurize your vessel to your desired psi, but once fermentation begins and those hungry, active yeast start creating CO2, the pressure inside the vessel will increase. Attach a spunding valve and set it to your desired pressure, and it will blow off when the pressure gets to high and close up again when it's back to your desired psi.
Pressure Transfers
Even if you don't have a pressurizable fermenter, you may have done pressure transfers from keg to keg during filtering or after fining. During pressure transfers, it's a good idea to have a bit of head pressure in the receiving keg, especially if you're transferring beer that is already carbonated. Having a spunding valve in place will allow you to consistently control the head pressure and give you more consistent results, without losing carbonation in the process.
Diaphragm vs. Poppet
With the poppet style spunding valve, a spring pushes against a poppet to keep the valve closed. When the poppet lifts up to open, the surface area the gas pushes against becomes larger, and the spring has to work harder to push the poppet down and reseal the valve. This can lead to more gas being released than intended, and the remaining pressure in your vessel may be at a lower psi than your spunding valve’s set psi. 
Instead of a poppet, the spring inside the BlowTie pushes against a diaphragm, which has an immensely larger surface area. This means the surface area that the gas pushes against while the diaphragm is closed is significantly closer to the surface area it pushes against when the diaphragm is open. This leads to higher accuracy, and the remaining pressure after excess gas is released will be much closer to your set blow off pressure.

Kit Includes:

  • BlowTie
  • Pressure Gauge
  • Ball Lock Disconnect
  • Duotight Tee & Flared Duotight Fitting
  • 2x Lengths of EVABarrier 8mm OD Tubing


Item # FE961
Shipping Eligible for Free Shipping Program
Availability California - Out Of Stock
Pennsylvania - In Stock
Weight 0.39 LBS
Community Q&A

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Why did you choose this?
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Pressurized closed transfers.
Refactored on Mar 13, 2020
David Heath recommended
Ryan D on Jan 27, 2020
Pressurized closed transfers.
Refactored on Mar 13, 2020
Fermenting under pressure is something I want to explore
Tyrone W on Jan 31, 2020
David Heath recommended
Ryan D on Jan 27, 2020
Keg fermenting
Eric G on Jan 25, 2020
To be able to ferment under pressure in the fermzilla
Jason Tysoski on Jan 17, 2020
Diaphragm Spunding Valve... about says it all
Bill j on Dec 25, 2019
need a spunding valve, this is supposed to be the best one.
TImothy B on Dec 23, 2019
Got for pressured fermentation
mushroommike on Dec 7, 2019
Convenience and the gauge by itself is on back order
William M on Oct 18, 2019
Fermenting under pressure is something I want to explore
Tyrone W on Jan 31, 2020
Keg fermenting
Eric G on Jan 25, 2020

5.0 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
ease of use
works great, very simple to use
March 25, 2020
2 weeks ago
Works as described. No leaks and kept steady pressure through out fermentation. Love it.
This work great for my first fermenting under pressure.
March 16, 2020
1 month ago
Worked great with my closed pressure transfer.
March 8, 2020
1 month ago
Very pleased, I added a couple feet of tubing between the "t" and the quick connect. Accurate and stable so far. The yellow pressure adjustment screw is very touchy, it's accurate and effective but a slight bump or brush off the sleeve could easily rotate it out of calibration.
January 31, 2020
2 months ago
Works perfect
This works just as advertised. It is better than the spring and poppet style. Air flow is easy to hear letting you know flow is coming through. I was able to perfectly dial in the pressure I wanted and it held that pressure without any problems.

I used the unit in conjunction with the automatic flow stopper when pressure transferring carbonated beer from my unitank.
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Added Oct 26, 2019
October 26, 2019
5 months ago