Understanding Pressure Release Valves (PRVs)
Pressure release valves are a safety mechanism that will release pressure above a certain threshold. This prevents unwanted and potentially dangerous build-up of pressure. Their mechanism is simple: a main shaft with an O ring at the end which is held down by a spring. Depending on the spring force, the PRV will contain the desired pressure in the vessel, releasing any unwanted pressure by compressing the spring, and breaking the seal. Once the pressure in the vessel drops down low enough the spring force once again seals the vessel, preventing the escape of any further pressure. This is a bit of it of a simplistic overview, as we don’t want to make this too confusing.
Our Improved Design
By changing the ‘cap’ of the PRV, we have managed to increase the maximum gas release rate significantly! What does this mean? This means a safer design that will help reduce over pressurisation risks. Particularly during forced carbonation, and gas transfer processes.
Our current PRV colour coding is as follows:
| Colour | Pressure Rating | Application | Compatibility |
| BLUE | 10 PSI | Spunding for Lagers, Ales, IPAs, Stouts and Wheat beers | Keg King Pressure Fermenters Keg King PET Kegs |
| PURPLE | 15 PSI | Spunding for Ales, IPAs, Stouts and Wheat beers | Keg King Pressure Fermenters Keg King PET Kegs |
| WHITE | 25 PSI (new design, faster gas release rate) |
Ideal for carbonating and oxygen free transfers | Keg King Pressure Fermenters Keg King PET Kegs |
| RED | 35 PSI | Obsolete, replaced by the improved design of the white PRV |
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| GREEN | 65 PSI | Regulator uses only | Keg King Regulators |
| GREY | 80 PSI | Stainless steel kegs use only | Keg King Stainless Steel Kegs |