BlowTie Diaphragm Spunding Valve Complete Kit

BlowTie Diaphragm Spunding Valve Complete Kit

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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 - In Stock
Pennsylvania - In Stock
Weight 0.39 LBS
Community Q&A

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Browse 1 question Browse 1 question and 27 answers
Why did you choose this?
MoreFlavor Store
gift suggested by son
Terry L on Nov 25, 2020
pressurized fermentation
Kevin B on Nov 16, 2020
gift suggested by son
Terry L on Nov 25, 2020
Pressurized fermentation
Bill M on Nov 18, 2020
pressurized fermentation
Kevin B on Nov 16, 2020
Corny keg fermenting under a bit of pressure for pilsner, and also for transfer to serving keg.
Jesse K on Nov 16, 2020
I want valve that can be easily cleaned
Kris C on Oct 24, 2020
recommended by David Heath on youtube.
Chris E on Oct 20, 2020
Carbonation on my lagers
Kevin R on Oct 20, 2020
For pressurized fermentation
Brian M on Aug 29, 2020
Diaphragm is much better than a piston type.
Jonathan S on Aug 26, 2020
Making more lagers these days
John F on Aug 25, 2020
To make pressure fermented mead and cider and perry
Jose A on Aug 25, 2020
fermenting under pressure
Phillip C on Aug 10, 2020
So I can ferment under pressure
Valued C on Jul 10, 2020
Justin G on Jun 25, 2020
Mike G on Jun 13, 2020
Heard that this is the best one. Read reviews
Edward b. M on May 28, 2020
I picked this for keg fermentations
Chavis F on May 28, 2020
Pressure fermentation and keg transfers with fermzilla
Matt S on Apr 17, 2020
Pressurized closed transfers.
Kyle Heon on Mar 13, 2020
Fermenting under pressure is something I want to explore
Tyrone W on Jan 31, 2020
David Heath recommended
Ryan 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 M 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
Pressurized fermentation
Bill M on Nov 18, 2020
Corny keg fermenting under a bit of pressure for pilsner, and also for transfer to serving keg.
Jesse K on Nov 16, 2020

4.3 / 5.0
15 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Sounding Valve Essential and they have it!
November 7, 2020
1 month ago
Not worth the money
The unit leaks and causes pressure to drop. I have tried to tighten and it still leaks. Therefore it has minimal value as a spunding valve.
November 5, 2020
2 months ago
Secure your connections well.
Works mechanically great, just have to make extra certain to make your connections are secure, as lateral force on the tubing from the gauge and gravity can cause leaks if extra care is not taken to secure them.
September 16, 2020
3 months ago
Requires constant adjustment
It does the job, but it is definitely not a set and forget. The spunding valve doesn't hold it's calibration, so I have to adjust the pressure down 2-3 times during a ferment.
September 8, 2020
Simple & Works
Using this for kegging carbonated beer from my unitank. Works and is ready right out of the box. Make sure to push the connectors in if any are loose. YouTube “Hop Killer Brewery” to see in action.
July 8, 2020
5 months ago
So so
Only three stars because the tubing pieces included were SO short I had a heck of a time disassembling the unit trying to fix a leak. Threlief valve was installed backwards, too.
June 10, 2020
6 months ago
Response from MoreFlavor
Thank you so much for your feedback. We really appreciate the honesty and value great feedback like this as it helps us improve our products. Cheers!
June 10, 2020
Malcolm MB
bought 2
One is very leaky and wont hold pressure. Also both of the gauges look to be inaccurate.
May 3, 2020
8 months ago
Response from MoreFlavor
We apologize for the bad experience you've had with this spunding valve kit. This is a new product and we appreciate your honest feedback so we can help you and all our other customers to get what you need. We are dedicated to providing the best support and products that we can. We are happy to work with you to find a solution to the issue, be it a replacement, refund, or exchange. If you haven't been in contact with our CS team yet please give us a call at 1-800-600-0033 or email in to info@moreflavor.com. We are always here to help. Cheers!
May 27, 2020
Malcolm MB
Very easy to use...even for a beginner like me.
I'm using this on the fermzilla and it's very easy to hold 12PSI while fermenting. This item does NOT include the extra tubing you will need in order to connect this item to a container full of cleaning solution so I highly recommend you purchase 5-6 feet of EVABarrier 8mm OD tubing (either 4ID or 5.5ID will be fine).
April 26, 2020
8 months ago
Works as expected
Got this to pressure transfer to kegs with carbonated beer from my SsBrewtech 14 gallon Unitank. Worked exactly as expected.
April 11, 2020
8 months ago
Works exactly like expected
Simply dial in the max pressure and listen for the faint hiss of escaping gas. Exactly what I wanted it to do while doing a fermenter to keg transfer. Keeps the head pressure from building up and stopping the flow of beer.
April 7, 2020
8 months ago