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Adjustable Pressure Relief Valve
Adjustable Pressure Relief Valve

Our Price: $11.99

Quantity in Stock:(Out of Stock)

Product Code: PRV

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.

Average Rating: Average Rating: 4.5 of 5 4.5 of 5 Total Reviews: 4 Click Here to Write a Review »

  3 of 4 people found the following review helpful:
3 of 5 Hmmm.... ?? June 7, 2018
Reviewer: David Basaraba from Spokane, WA United States  
I understand why you changed out the spring, in order to give greater tension and therefore more micro-adjustment ability in the smaller PSI range... but how do I know what pressure I'm leaving my tank at without standing there until the head-pressure reaches that of the external regulator?

BrewHardware Response:

Spring-based PRVs (or even diaphragm based regulators) cannot have physical indicators for cracking pressure period. It is unfortunate that manufacturer of the unit we use puts lines on a scale suggesting that it is possible but even with the stock spring, those lines can be up to 20% deviation from the actual cracking pressure. The only way to reliably set the vent pressure is to use an external source of pressure such as compressed air or CO2. If you find a unit that can somehow pull off what you expected this unit to do, please let us know and we'll sell it.

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  0 of 0 people found the following review helpful:
5 of 5 PVR March 20, 2018
Reviewer: Thomas Paffrath from Salisbury, NC United States  
Great pressure release valve for fermenting  under Controlled Pressure. (Spunding)

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  3 of 3 people found the following review helpful:
5 of 5 Does it again!! March 17, 2018
Reviewer: Jerry Olstad from Fort Bragg, CA United States  
I mean really? Bobby went and found us a better spring making a much better product for our intended use.

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  0 of 0 people found the following review helpful:
5 of 5 January 29, 2018
Reviewer: Francisco Ramos from Dulles, VA United States  

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