03:17 GMT, 21 July 2008 Last Updated on 2008-01-09

Glossary

Terms and technology explained

Air Relief Valve A valve, automatic in operation, used to release pressure when filling or emptying a pipeline or tank. Also used for automatic air release from hot water heating systems. Sometimes called air eliminator. Air Relief Valve Purgeur d'Air Entlüftungsventil Purgador The above is a sample page from the "Valve & Actuator Drawings Handbook with Full Glossary". For details of how to purchase this or other BVAA publications click here

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