How to install a spunding valve in a brewing set up.

Monday, February 13, 2023
A spunding valve is a pressure relief valve used in beer brewing to control and release excess pressure during fermentation. 

It is attached to a fermentation vessel and set to a specific pressure level, allowing excess gas to escape when the pressure exceeds the set level. 

This process is important for preventing over carbonation and potential explosions. 

Additionally, spunding valves can be used for carbonation of beer in the keg by attaching it to the gas-in port and setting the desired carbonation level.

spunding valve

Here is a step-by-step guide on how to use a spunding valve when brewing beer:

Materials and Tools Needed:

  • A fermentation vessel, such as a keg or fermenter
  • A spunding valve
  • A gas disconnect with a barb or flare fitting
  • A pressure gauge
  • Teflon tape or other thread sealant (optional)
  • A wrench or adjustable pliers (optional)


  1. After primary fermentation has completed and the beer has reached the desired gravity, prepare the fermentation vessel for spunding by ensuring it is clean and sanitized.
  2. Attach the spunding valve to the gas-in port of the fermentation vessel using the gas disconnect with a barb or flare fitting. You may need to use a wrench or adjustable pliers to tighten the connection, but be careful not to overtighten and damage the valve or vessel.
  3. Set the pressure gauge on the spunding valve to the desired pressure level. This will depend on the type of beer you are brewing and the carbonation level you are aiming for. Typically, pressure levels range from 5-30 PSI.
  4. Open the valve on the spunding valve to allow gas to flow into the fermentation vessel. This will pressurize the vessel and begin the spunding process.
  5. Monitor the pressure gauge and adjust the spunding valve as necessary to maintain the desired pressure level. This may involve opening or closing the valve slightly or adjusting the pressure gauge.
  6. As fermentation continues, excess gas will be released through the spunding valve. Make sure that the spunding valve is positioned in a safe location and that the released gas is not causing any hazards or unwanted effects.
  7. When the fermentation is complete and the desired carbonation level has been reached, you can remove the spunding valve and transfer the beer to a serving vessel, such as a keg or bottle.

Challenges and Troubleshooting:

  • Be sure to properly clean and sanitize all equipment before use to avoid contamination.
  • Use caution when tightening connections to avoid damaging the valve or vessel.
  • If the spunding valve is not releasing excess pressure, it may be clogged or not set at the correct pressure level. Check the valve for obstructions and adjust the pressure gauge as necessary.

Safety Precautions:

  • Always wear appropriate protective gear, such as gloves and eye protection, when handling equipment or working with pressurized vessels.
  • Make sure the fermentation vessel is properly vented to avoid overpressure and potential explosions.
  • Never exceed the recommended pressure level for your equipment and always follow manufacturer instructions.

Instructional video for sounding installation

Additional Resources:


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