Sealing structure for gaseous fuel

In metal-on-metal sealing structures, the sealing criteria employed for high pressure liquid fuel does not work when sealing gaseous fuels. An improved method for sealing a gaseous fuel between gaseous fuel conduits in an internal combustion engine comprises forming a contact band between two surfaces of a sealing structure between a first conduit and a second conduit. A width of the contact band is at least equal to the larger of a minimum contact pressure width where contact pressure is at least equal to a predetermined minimum contact pressure; and a minimum yield zone width where at least one of the two surfaces have plastically deformed. 在金属-金属密封结构中，当密封气体燃料时，用于高压液体燃料的密封标准不起作用。种用于在内燃机中在气体燃料管道之间密封气体燃料的改进方法包括在第管道与第二管道之间的密封结构的两个表面之间形成接触带。所述接触带的宽度至少等于下述中的较大者：接触压力至少等于预定的最小接触压力的情况下的最小接触压力宽度；以及所述两个表面中的至少个已经塑性变形的情况下的最小屈服区宽度。