While this spunding valve may look a little clunky compared to the more common brass one with the poppet valve on the end after a lot of testing we believe this to be a superior design.
The diaphragm valve is much more accurate and allows for extremely precise adjustments of the outlet pressure.
Aspundingvalve is an adjustable pressure relief valve, they are most commonly used to do keg to keg transfers of carbonated liquid under pressure.
To do this attach your regulator to the full vessels gas inlet post (snub nosefor instance) then join the 2 liquid post together with 2 liquid disconnects and a length of beer line.
Attach thespundingvalve with a gas disconnect to the empty vessel (mini keg for example).
Set the pressure on the regulator to 12-15psi and then unwind thespundingvalve until gas begins to vent. Set pressure to 8-10psi on it and the liquid will transfer across under pressure without losing any carbonation.
It can also be used to set a release point for pressure in a pressure fermenter, this is very useful as you can set it to the correct psi (depending on fermentation temperature and beer style - see this page for more details) and once finished the beer will already be carbonated (you will need to either chill the fermenter to allow the liquid to hold carbonation while you bottle or use the method outlined above totransferunder pressure to stop it losing the carbonation while warm though.
Good item though it doesn't have the pressure gauge which is crucial to effective use of a sounding valve. Photos of reviewers show this valve as does the review request though the product does not include. I've spent extra money elsewhere to get a tee and pressure gauge to use effectively.
The image on the product page you purchased from doesn't have a pressure gauge and the price has been discounted by 25% to reflect this. There is also a link to a video where I show you how to set the pressure release without the gauge at the top of the page. We stopped including the gauge as they are not needed and likely to get damaged by people not reading instructions or information before using...
Spundle Value Essential
Definitely a must in home brewing. Very useful tool to set at many times during the whole process. Thanks for recommending exactly what we needed.