Variable Pressure Relief Valve (VPRV / PRV) / Spunding Valve

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Variable Pressure Relief Valve (VPRV / PRV) / Spunding Valve

A spunding valve is an adjustable pressure relief valve with a gauge attached to show internal vessel pressure.

Perfect for pressure brewing / pressure fermenting in your current systems or with the Fermentasaurus

Note: This requires a gas MFL disconnect to be used

This Adjustable/Variable Pressure Relief Valve (VPRV / PRV) or Spunding Valve with gauge allows you to relieve pressure while filtering your beer from one keg to another while keeping a closed system. Fits onto a MFL ball lock disconnect or other custom threads by taking off the FFL fitting or 3/8 fitting.

Use this to help set CO2 pressure in Kegs. Great for those who want to naturally condition or also great for keeping pressure when running beer through filters

You can also use the VPRV to naturally carbonate beer in a keg by setting the desired pressure and leaving it to carbonate. No issues with over carbonation anymore!

Adjust the pressure by turning the end of the PRV. Simply turn until the desired pressure is maintained.

Gauge face reads 0-15 psi.

Has a FFL fitting to attache to an MFL Ball lock fitting.

Keg transfers of carbonated or un-carbonated liquid under pressure:
First, pressurise an empty keg to the same pressure as your full vessel you want to transfer from. (around 12-15psi)

Then attach your regulator to the full vessels gas inlet post (fermentasaurus or full keg for instance) then join the 2 liquid post together with 2 liquid disconnects and a length of beer line.

Attach the spunding valve with a gas disconnect to the empty vessel (mini keg for example). 

Set the pressure on the regulator to 12-15psi and then unwind the spunding valve until gas begins to vent. Set pressure to 8-10psi on the spunding valve 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 the fermentasaurus, this is very useful as you can set it to approx 12-15 psi (depending on fermentation temperature) and once finished the beer will already be mostly 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 to transfer under pressure to stop it losing the carbonation if it is warm however.


Note: This does not include the gas MFL disconnect unless specified in the drop down menu. Additional disconnects can be purchase on the following pages:

You can purchase the gas/grey MFL disconnect here >>

Or the Stainless gas MFL disconnect then click here >>

Or the Check Valve gas MFL disconnect then click here >>


NOTE: Be wary of any liquid transferring into the guage. If pressure brewing (depending on the recipe) there is a chance of krausen bubbling up into the gauge. Also when transferring from keg to keg, if you over fill the receiving keg then liquid could also get into the gauge as well. An inline check valve or check valve disconnect will help stop this. Only use this guage if you are confident in your ability. We cannot take any responsibility for faulty gauges due to user issues as above.


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