BlowTie Diaphragm Spunding Valve Complete Kit

BlowTie Diaphragm Spunding Valve Complete Kit

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Due to high demand, this item is currently out of stock. Be the first to receive your items by placing a pre-order today. We will automatically ship this item to you when we receive more inventory.
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


Prebook Item: Please note this item is not currently in stock, but is available for Pre-Order. We do require payment in full in order to reserve stock.
Item # FE961
Weight 0.39 LBS
Community Q&A

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Why did you choose this?
MoreFlavor Store
Fiona S on Jan 13, 2021
Quick Ferment LAGER
Joe B on Jan 8, 2021
Fiona S on Jan 13, 2021
To pressure ferment
Will S on Jan 13, 2021
Quick Ferment LAGER
Joe B on Jan 8, 2021
Pressure fermentation
Anil V on Jan 8, 2021
ferment under pressure and value
Gary A on Jan 6, 2021
Need for pressure fermenting
Christopher D on Dec 31, 2020
Pressure fermenting in a keg
Stephen S on Dec 17, 2020
Better then one I got
Rick T on Dec 16, 2020
Corny keg pressure fermentation
Steven B on Dec 15, 2020
The description
Clements S on Dec 14, 2020
Will pressure ferment in the future.
Samuel Jason N on Dec 14, 2020
pressure fermentation
Steve J on Dec 12, 2020
Faye A on Dec 11, 2020
lagers bro
Nicholas A on Dec 10, 2020
works out of the box not configuration
James K on Dec 8, 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
To pressure ferment
Will S on Jan 13, 2021
Pressure fermentation
Anil V on Jan 8, 2021

4.2 / 5.0
18 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 3 out of 5
Works ok.
Kind of a pain in the *** to set up. You have to make fine adjustments throughout the span of a day until you get it set to your desired PSI. AT first it wasn't working at all but I gave it a good bump and the diaphragm stopped sticking. The set screw is pretty short so setting it to 10 PSI was almost at the end of the threads. Overall it worked ok.
January 6, 2021
4 weeks ago
Rated 5 out of 5
Alsome just got done using it.
It lot better then the metal one i brought from you guys.
December 29, 2020
4 weeks ago
Rated 4 out of 5
Measures pressure accurately
The gauge does what it is supposed to and is accurate and responsive. The pressure fittings for the tubing and its connections sometimes fall apart, even with slight motion to the assembly
December 21, 2020
2 months ago
Rated 5 out of 5
Sounding Valve Essential and they have it!
November 7, 2020
2 months ago
Rated 3 out of 5
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
3 months ago
Rated 4 out of 5
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
4 months ago
Rated 3 out of 5
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
Rated 5 out of 5
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
6 months ago
Rated 3 out of 5
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
7 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
Rated 1 out of 5
bought 2
One is very leaky and wont hold pressure. Also both of the gauges look to be inaccurate.
May 3, 2020
10 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