Valve Train : An assembly of valves, pressure control devices, and other fittings that form an integrated system for flow or pressure control and safe operation of a burner
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}