| 摘要 |
<p>A valve shaft connection structure for a pressure reducing valve is such that an insertion recess (72) which opens toward a valve mechanism is provided coaxially with a diaphragm rod (68); that at one end of a valve shaft (30), there are provided a reduced diameter shaft section (30a) and a pair of expanded diameter sections (30b, 30c), the diameters of the pair of expanded diameter sections (30b, 30c) being larger than that of the reduced diameter shaft section (30a), and each of the pair of expanded diameter sections (30b, 30c) being located at one of the two shaft longitudinal ends of the reduced diameter shaft section (30a); that a holding plate (74) which has an engagement recess (73) that opens toward one side and which is formed in such a way as to have an approximately U-shaped cross section, is inserted into the insertion recess (72), with the reduced diameter shaft section (30a) loosely inserted into the engagement recess (73); and that there is engaged an engagement ring (78) witha first engagement groove (76) which is arc-shaped and is provided around the outer circumference of the holding plate (74) and with a second engagement groove (77) which is annular and is provided around the inner circumference of the insertion recess (72), the aforementioned engagement ring (78) being permitted to expand and shrink along the radial direction of the valve shaft (30). Due to the above, it is possible to connect the valve shaft (30) to the diaphragm rod (68) under a simple configuration with low production cost, while permitting inclination of a diaphragm with respect to a plane perpendicular to the valve shaft direction, as well as mispositioning of the diaphragm center and the valve body shaft center.</p> |
