Pressure vessel

A pressure vessel comprising:

• a nozzle configured to be coupled to a valve;
• a liner formed on an inner peripheral surface of the nozzle and including:
• a cylinder part,
• dome parts formed at opposite ends of the cylinder part, and
• skirt parts formed between the cylinder part and the dome parts;
• and
• a composite material layer including a hoop layer and a helical layer, the hoop layer and the helical layer being wound around an outer circumference of the liner,
• wherein the valve includes:
• a first area formed on an outer peripheral surface of the valve, wherein the first area is coupled to an inner peripheral surface of the liner and includes a stepped surface, and
• a second area formed on the outer peripheral surface of the valve and extending upward from the stepped surface along a lengthwise direction of the valve,
• wherein the nozzle includes a third area formed on an inner peripheral surface of the nozzle, wherein the third area is in contact with the second area of the valve,
• wherein the liner includes a fourth area formed on the inner peripheral surface of the liner, wherein the fourth area includes a stepped surface in contact with the first area of the valve, and
• wherein a first seal part is provided between the stepped surface of the first area of the valve and the stepped surface of the fourth area of the liner.