Patent ID: 8820712

Claim:
An apparatus, comprising: an opening and closing valve configured to communicate high-pressure hydrogen gas that opens and closes a passageway by causing a valve body and a valve seat, which are coaxially disposed, to come into contact with or separate from each other, wherein the valve body includes a conical first contact surface and is biased by a biasing member, and the valve seat includes an annular second contact surface of which an initial contact portion with respect to the conical first contact surface has a circular-arc cross-section, wherein one of the conical first contact surface and the annular second contact surface is formed of polyamide-imide, and the other thereof is formed of metal, wherein the passageway comprises a diameter ranging from 3 to 8 millimeters, wherein the conical first contact surface comprises a conical angle ranging from 60° to 120°, and wherein the circular-arc cross-section comprises a curvature radius ranging from 0.1 to 0.5 millimeters.