The BlowTie Gen 2 features an integrated analog pressure gauge (1-15 psi) so you can quickly and easily dial in your pressure for the perfect fermentation or transfer. The analog gauge is removable and can be swapped out with a gauge of a different pressure range or it can be swapped out for theDigital Mini Pressure Gauge.
Pressure fermentation is becoming more and more popular at the homebrew level and you want a reliable and safe way to release pressure in a controlled manner. You'll pressurize your vessel to your desired pressure as measured with a trusted gauge, attach the BlowTie spunding valve and, loosen it until you just hear the gas start flowing, then tighten it up just until it stops flowing. Verify that the BlowTie is reading your desired set pressure and you are all set. It will automatically release excess pressure as it builds.
Using a spunding valve when transferring into a keg from a pressurized fermenter or unitank is a must! If you don't have a pressure-rated fermenter, you may have fermented in a keg, done pressure transfers from keg to keg after filtering or fining, or just filled a smaller keg to take to an event or gathering. If you’re transferring carbonated beer, attaching a spunding valve acts like a counterpressure device, helping to keep the CO2 in solution, ensuring the beer doesn’t foam uncontrollably, and protecting it from oxygen intrusion with a positive pressure environment.
Diaphragm vs. Poppet
A poppet-style spunding valve has a spring that pushes against a poppet to keep the valve closed, like in your keg posts. When the pressure exceeds the spring's rating, 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 allows more gas to escape and the remaining pressure in your vessel may be at a lower psi than your spunding valve’s set psi until it recovers.
The BlowTie uses a diaphragm, which has an immensely larger surface area than a poppet. This means the surface area that the gas pushes against while the diaphragm is closed is much closer to the surface area when the diaphragm is open. This makes the valve more accurate and the remaining pressure will be much closer to the set pressure after the excess pressure is released.