| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve operability and durability by preventing the clattering due to the wear of sliding parts, the generation of noise, etc. SOLUTION: Shaft parts 3A, 3B disposed at both ends of a rotor 3 are respectively freely rotatably and pivotally supported by means of radial ball bearings 30. The outer races 35 of these radial ball bearings 30 fit to the inner periphery of a valve casing 2 and the outside diameter thereof is set larger by about 300μm than the outside diameter of the rotor 3. A pressing member presses the rotor 3 in an axial line direction via the radial ball bearings 30. A turn table 13 is fixed to the bottom end face of the shaft part 3B and the switching path of the rotor 3 is switched by tuning this turn table 13 by means of a lever 4.</p> |
