Abstract: A structure for a high-pressure vessel is provided to inhibit a gap between a plastic liner and a plastic sealing member due to the plastic sealing member being combined with the plastic liner by thermal bonding, thereby preventing the leakage of high-pressure gas to the gap between the plastic liner and the plastic sealing member. In addition, as the plastic liner and the plastic sealing member made of the same materials are combined with each other by the thermal bonding, use of the conventional lower fastening member is unnecessary, and further, use of a rubber sealing member for maintaining airtightness is unnecessary. Thus productivity via reduction in the number of components, a weight, a cost, and man-hours is improved.

Abstract: A noiseproof vent valve for a fuel tank is provided. A damping member installed in the vent valve has at least two elastic pieces, preferably the four elastic pieces. The movement of the float is absorbed by elastic deformation of the elastic pieces, and thus the float is prevented from coming into contact with a lower end forming the bottom of a valve body. However excessively the float fluctuates, no “clicking” contact noise occurs at the vent valve. As a result, the merchantability of a hybrid vehicle sensitive to low noise can be greatly increased.