| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a valve excellent in wear resistance and easy to maintain whereas a valve for gas-tightly interrupting a flow path has been difficult to maintain owing to external leakage by wearing and presence of a plurality of working members. <P>SOLUTION: A valve element 8 has an external valve element part 9 and an internal valve element part 11. The internal valve element part can relatively move linearly to/from the external valve element part. The internal valve element part is pressed against a valve housing owing to pressure difference to a valve element when in closure settings, thereby eliminating the pressure difference for the external valve element. A valve seat 5 has a first inner face 14 radially facing inward, and the external valve element part has a first outer face 15 radially facing outward. The first outer face is positioned such that a radially sealing contact is located between the first inner face and itself when in closure settings. The external valve element part has a second inner face 16 facing radially inward, and the internal valve element part has a second outer face 17 facing radially outward. The second outer face is positioned such that a radially sealing contact is located between the second inner face and itself. <P>COPYRIGHT: (C)2013,JPO&INPIT |
