When it comes to using a spunding valve, determining the appropriate pressure can be a bit of trial and error. As a starting point, I would suggest setting the pressure to around 10 PSI (pounds per square inch). This is a safe and conservative pressure that should work well for most brewers.
However, it's worth noting that the ideal pressure for spunding can vary depending on factors such as the specific beer being brewed, the yeast strain used, and personal preference. Some brewers prefer to start with lower pressures, around 5 PSI, and gradually increase it over time to find their “sweet spot.”
One reason for starting with a lower pressure is to avoid overcarbonating the beer. If the pressure is set too high from the beginning, it can lead to excessive carbonation and potentially cause the bottles or kegs to explode. This is definitely something you want to avoid!
Another consideration when setting the spunding valve pressure is the yeast's ability to handle the pressure. Some brewers believe that higher pressures can stress the yeast, potentially affecting the flavor and overall quality of the beer. While there isn't a definitive answer on this, it's something to keep in mind.
Personally, I have found that 10 PSI is a good starting point for most styles of beer. It provides enough pressure to carbonate the beer adequately without risking overcarbonation. However, I've also experimented with higher pressures, up to 15 PSI, without any negative effects on the beer or the yeast.
It's important to note that different spunding valves may have slightly different pressure ranges and accuracy. So, it's a good idea to check the manufacturer's instructions and recommendations for your specific valve to ensure you are using it correctly and safely.
I suggest starting with a pressure of around 10 PSI when using a spunding valve. However, you can certainly start lower and gradually increase the pressure over time to find your preferred carbonation level. Just be mindful of the yeast's ability to handle the pressure and avoid setting it too high to prevent any potential issues. Happy brewing!