ADJUSTABLE PRESSURE RELIEF VALVE from Brew HardwareMore Info
From the product description, check product page for current description, price and availability:
1/4″ NPT threads. 100% stainless with a buna seat.
0-30psi give or take. Spring-based relief valves are not exactly precision so expect a plus or minus of a couple PSI.
Uses? Measuring carbonation level in a keg already carbonated (measure temp, measure constant pressure over an hour, refer to carbonation chart), Vent a keg that is naturally carbonating with priming sugar to avoid overcarbonation, pressure ferment in a corny (the true meaning of spunding).
We include this item in our complete spunding units.
Warning: Be extremely careful with pressurized vessels. This item is not suitable as the only means of pressure relief in a completely sealed tank because the flow rate is relatively low and it may be clogged easily such as in the case of fermentation will inadequate head space. Please consider using a secondary pressure relief method at a slightly higher pressure setting for added safety. In the case of a corny keg for example, the lid has a pressure relief that will blow before the safe pressure rating of the keg.
Note: some customers have expressed confusion or disappointment in how this unit behaves. To be very clear to avoid confusion, this unit does not have reliable visual indicators to help set the unit to vent at a specific pressure. In other words, there is no detent or marking that says “vent at 10 psi”. Spring-based vents are relatively crude devices and as such the exact venting pressure at any given knob position is only reliably gauged by pressurizing with an external source such as compressed air or CO2 and observing the vent pressure with an installed pressure gauge such as how we build our spunding valves.
Another way to say it as a practical example, if you want to set it to vent at 10 psi, you would tighten up the knob, apply about 20 psi into the system and then rotate the knob counterclockwise until it begins to vent. Watch the gauge and see where it stops venting. That is now the current vent pressure setting. If it’s higher than desired, rotate the knob a little more counterclockwise until venting starts and then stops at the correct pressure. Once you think you have it right, add more pressure to the system and make sure it vents down to the pressure once again.
Make sure the components you use are compatible and rated for your intended application. Contact manufacturer with questions about suitability or a specific application. Always read and follow manufacturer directions.
This could be used as part of a Spuding Valve assembly. A Spunding Valve [See: Spunding Valve Resource Post] allows you to ferment under pressure, naturally and precisely carbonate in the keg, fix over-carbonated beers and lots more.
- Brew Hardware has this for just $11.99.
- This is an item that has had consistent availability problems. If it’s sold out… Connect with HBF and we’ll let you know when it’s available again
Alternative: Adjustable Stainless Gas Pressure Relief – 1/4 in. MPT via MoreBeer << also generally has availability issues
Homebrew Finds is Spunding Central! Build a Spunding Valve! – How and Why << a top resource on the subject
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