| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve seat structure of a valve capable of securing high sealability with an energizing force by the elasticity of a valve seat in which plastic deformation is suppressed, capable of securing high sealability by energizing the valve seat by a sealing fluid pressure in closing a valve element, and suitable for valves such as a rotary valve of internally sealed structure and a ball valve of an externally sealed structure. SOLUTION: The base part 28 of the bellows type valve seat 27 formed of a metal excellent in heat resistance/wear resistance is fitted to the tip part 21b of a valve box sleeve 21 or the outlet 20b of the valve box sleeve 21. The bellows type valve seat 27 is so formed that multiple portions of the bottom parts 27a and the crest parts 27b are continued with each other in the axial direction. A valve box side seat part 30 in contact with and apart from a recessed spherical surface-like valve element seat part 23 on the rear surface of a rotary valve element 24 is formed at the tip part. Then, a relation between a mounting radius R from the axis C of the bellows type valve seat 27 to the outer end of the base part 28 and a seal radius R1 is set to R≤R1 or desirably to R < R1. COPYRIGHT: (C)2006,JPO&NCIPI
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