BlowTie 2 Diaphragm Spunding Valve with Gauge

BlowTie 2 Diaphragm Spunding Valve with Gauge

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The Blow Tie Spunding Valve 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.

The BlowTie 2 features an integrated pressure gauge so you can quickly and easily dial in your pressure setting. The gauge is removable and can be swapped out with a gauge of a different pressure range.

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 too 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.
Set Up
The BlowTie spunding valve comes with 8 mm Duotight fittings on the inlet and outlet, and we recommend using it with EVABarrier 8 mm OD tubing (D1717 or D1718). You'll also need the flare Duotight fitting (DUO106) in order to attach it to a ball lock or pin lock disconnect. Dialing in your desired pressure is even easier with the BlowTie 2, thanks to the integrated pressure gauge. Simply start with the adjustment knob fully closed, then slowly open it until the gauge reading matches your desired pressure setting.
  • Made from food grade acetal
  • Stainless screws
  • Easily disassembles for cleaning
  • 8mm (5/16") Duotight fittings at both ends
  • Interchangeable pressure gauge
  • Gauge reads from 0-15 psi

WARNING: Do not exceed gauge pressure. Exceeding the pressure range will damage the gauge.

Kegland Part number: KL15042


Community Q&A

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Browse 3 questions Browse 3 questions and 11 answers
Why did you choose this?
MoreFlavor Store
I pair this with the fermzillas, ferment everything at 5 psi, with amazing results
Vlad C on Sep 16, 2020
Ease of transfer
Jeff H on Sep 3, 2020
I pair this with the fermzillas, ferment everything at 5 psi, with amazing results
Vlad C on Sep 16, 2020
Doing pressurized mead fermentations
Jose A on Sep 10, 2020
Ease of transfer
Jeff H on Sep 3, 2020
Pressure ferment in kegs
Jonathan S on Aug 11, 2020
Building my own multi trunk secondary regulator - needed to be able to set in-line regulators without gauges.
Thomas P on May 20, 2020
To adjust natural carbonation.
Christopher A. B on May 17, 2020
A must for pressure fermenting
Darin E on May 14, 2020
The Homebrew Challenge youtube channel showed in a video
robert m m on May 12, 2020
Newest tech for pressure fermenting
Thomas McGloine on Apr 21, 2020
Doing pressurized mead fermentations
Jose A on Sep 10, 2020
Pressure ferment in kegs
Jonathan S on Aug 11, 2020
I'd like to use pressure to bottle but ferment around normal air lock pressure. Is there a minimum effective operating pressure for this valve? Could it operate similar to a simple airlock?
David Schindler on Apr 24, 2020
What is the range for operating temperature? Can it work with steam?
Duane Jenness on May 2, 2020
BEST ANSWER: Temperature rated to 212°F (100°C), so do not use with steam. Cheers!

3.3 / 5.0
3 Reviews
5 Stars
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1 Star
Works great for me and my Fermenazilla
September 10, 2020
3 weeks ago
Not working. Doesn’t hold pressure
Got this car a separate gauge to make a simple sounding valve with a CMB gas disconnect and the flat to push fit connector. Hooked up about a foot long piece of barrier tubing, charged a keg to 22psi since I planned to spund at 68F and popped my new spunding valve on. Valve read correct but within 10 minutes it was obvious I had a leak as the pressure dropped to 15psi. Tried the water test and got some bubbles from the area where the gauge is but figured out that’s an open box so water was just displacing air. Tightened everything up and still had a leak that I couldn’t find. Cut the tubing much shorter and made a precise effort to make sure the ending the tubing were as square as I could get them. Recharged to 22 psi and looked like it might hold but 12 hours later it’s at 15psi again so while things are better it’s still leaking. So basically it’s useless as is
May 26, 2020
4 months ago
Response from MoreFlavor
To determine if the spunding valve, or other components in your keg, are leaking can you put 22 psi in your keg, without spunding valve attached, and test it 24 hours later. It seems odd that the pressure leaked to 15 psi both times, but did so in 10 minutes one time and 24 hours the next. This would make us think there is a seal issue with the keg lid o-ring or body connect.
September 4, 2020
Malcolm MB
Great multi purpose tool
Great spunding valve for use during fermentation, pressure transfers, and keg pressure after rebuild of orings and poppets
Checking for pressure leaks in new Flex+
Testing keg pressure
May 24, 2020
4 months ago