| 摘要 |
In a valve stem connection structure of a pressure reducing valve, an insertion recess portion (72) opened toward a valve mechanism is coaxially provided in a diaphragm rod (68); a reduced diameter stem portion (30a) and a pair of enlarged diameter stem portions (30b, 30c) provided respectively on opposite sides in an axial direction of the reduced diameter stem portion (30a) and each having a diameter larger than that of the reduced diameter stem portion (30a) are provided in one end portion of the valve stem (30); a holding plate (74) formed to have a substantially U-shaped cross section while having an engaging recess portion (73) open to one side is inserted into the insertion recess portion (72) while the reduced diameter stem portion (30a) is loosely inserted into the engaging recess portion (73); and an engaging ring (78) expandable and contractable in a radial direction of the valve stem (30) is engaged with an arc-shaped first engaging groove (76) provided in an outer periphery of the holding plate (74) and an annular second engaging groove (77) provided in an inner periphery of the insertion recess portion (72). Accordingly, it is possible to connect a valve stem to a diaphragm rod with a simple structure low in manufacturing cost while allowing inclination of a diaphragm with respect to a surface orthogonal to a valve stem direction and displacement of an axis of a diaphragm side and an axis of a valve body side.
|
