The main functionality of the Gas Valve Train is to supply 2-stroke engines with methane gas, both in the initial slow pressure build-up scenario, and in the normal supply condition. The Gas Valve Train MkIV carries the experience of its predecessor, while playing a role in the future engines that are meeting the future emissions regulations.
LNG significantly reduces or eliminates emissions of SOx and particulate matter. The reduction of NOx emissions depends on engine technology, but is typically well within the strictest International Maritime Organization NOx Tier III requirements in Emission Control Areas. The maximum achievable reduction in CO2 emissions during combustion of LNG is 25%, when compared with using heavy fuel oil.