Cask breather
A cask breather (sometimes called a cask aspirator) is a type of demand valve used to serve draught beer. The cask breather enables the empty space created when beer is drawn from a to be filled with carbon dioxide from an external source. This prevents ambient air from being drawn into the cask, thus extending the life of the beer by preventing oxidation.[1]
To avoid carbonation of the beer, the carbon dioxide gas added by a cask breather is at low pressure, unlike the high pressure gas used to pressurize keg beer. Cask breathers are typically used in conjunction with a pressure regulator to ensure the gas pressure is sufficiently low.[citation needed]
Before 2018, the use of cask breathers was opposed by the Campaign for Real Ale (CAMRA),[2] a policy that was changed in April 2018 to allow pubs using cask breathers to be classified as real ale pubs and listed in the Good Beer Guide.[3]
References[]
- ^ Hornsey, Ian S. (Ian Spencer) (1999). Brewing. Royal Society of Chemistry (Great Britain). Cambridge, UK: Royal Society of Chemistry. p. 156. ISBN 0-85404-568-6. OCLC 42274456.
- ^ "The Oxford Companion to Beer Definition of A cask breather". Craft Beer & Brewing. Retrieved 2020-02-02.
- ^ "CAMRA looks to the future as its members call for positive change". CAMRA - Campaign for Real Ale. Retrieved 2020-02-02.
See also[]
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- Valves
- Beer vessels and serving
- Bartending equipment
- Beer and brewery stubs
- United Kingdom stubs