See under exhaust-gas recirculation.
Definition for egr valve (2 of 2)
[ ig-zawst-gas ]
/ ɪgˈzɔstˌgæs /
a method of returning part of the exhaust gases to an engine by means of a valve (EGR valve) in order to reduce the combustion temperature, which leads to a reduction in the formation of pollutants. Abbreviation: EGR
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019