BlowTie 2 Spunding Valve Complete Kit

BlowTie 2 Spunding Valve Complete Kit

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With this complete kit you'll be ready to use the BlowTie 2 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 2 w/ Integrated Pressure Gauge (0-15 psi)
  • Ball Lock Disconnect
  • Duotight Flare Fitting
  • 8 mm OD Rigid Plastic Joiner



Item # FE963
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - Out Of Stock
Weight 0.38 LBS
Community Q&A

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Pressure transfers
Jason S on Aug 19, 2021
Needing a way to control fermentation pressures
Tyler Easton on Jul 3, 2021
Pressure transfers
Jason S on Aug 19, 2021
trying something new with kegging
curtis g on Jul 7, 2021
Needing a way to control fermentation pressures
Tyler Easton on Jul 3, 2021
trying something new with kegging
curtis g on Jul 7, 2021
Is there a pin lock version?
Annabritt E Coakley on Jul 11, 2021
BEST ANSWER: The Duotight Flare fitting is easily transferred to a pinlock fitting. It will fit on all standard 1/4" flare fittings in your toolbox.

4.0 / 5.0
2 Reviews
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1 Star
Rated 4 out of 5
works but knob feels loose below ~2 psi
Using this for air-less transfer from fermenter to keg and feels like the adjustment knob is hanging on by a few threads at these low PSIs. Not a functional issue but does lack adjustability at this low pressure.
September 13, 2021
2 months ago
Rated 4 out of 5
Only goes to 15 psi
Appears well built but I'm going to return this and get a different one. For primary fermentation, 10-15 psi might be fine. But if you want to naturally carbonate in the keg, I've read that it needs to be more like 20 psi so that when the beer cools, the pressure will come down to typical serving pressure.
August 21, 2021
1 month ago