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Version 2 - Duotight BlowTie Diaphragm Spunding Valve w/ Integrated Pressure Gauge (0-15 PSI) Complete Kit - KB03529
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Quick Overview
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.
- Quickly and easily dial in your pressure setting.
- Gauge is removable and can be swapped out with a gauge of a different pressure range.
- 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
KegLand item #: KL15042
Product Overview
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, includes the recommended EVABarrier 8 mm OD tubing, Gas in flare quick disconnect and 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.
Specifications:
- 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.
Customer Reviews
4.8 Based on 4 Reviews
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- Reviews
- Questions
Filter Reviews:
GK
08/29/2021
Glen K. 
United StatesAs advertised
Easy to assemble and clean. Works great.
TP
08/23/2021
Timothy P. United Statesblow tie
looks good... you should provide instructions for assembly and use....
MZ
08/05/2021
Mark Z. United StatesBlowtie 2
Love it. Easy to set held strong through fermentation.
MG
12/07/2020
Michael G. United StatesDuotight Spunding Valve V2
Bought this so I could try out pressurized fermentation. I saw there was a V1 but bought this new version since there are less leak paths and read on-line review that said it was a better choice After I received it I tested it against a precision gauge I have and the BlowTie on a scale of 0-15psi reads between 1 to 1.5psi low. This should work well but wondering it the V1 would have been a better choice for me since the gauge face is MUCH larger and easier to read plus looks like you can easily change out the gauge on the V1 with one that has a different pressure scale range. If you are looking for compact this is the one to buy - if not consider the V1.
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