GVU (gas valve unit) is a unit installed before dual fuel engine. Its main task is to regulate the air pressure before the engine air inlet according to the load of the engine. Further, whether GVU is responsible for inerting, electrostatic discharge and purging procedures of gas supply pipeline, it is related to dual fuel engine. GVU-ED™ is delivered as a airtight sealed enclosure to meet the requirements for installation in non hazardous areas.