| 摘要 |
PURPOSE:To facilitate the adaptation to the change of the sort of gas by providing an orifice plate shaped in accordance with the sort of gas to be exchangeable in a cock body and mounting the plate on the cock body via concave and convex parts to be mutually fitted. CONSTITUTION:On a closing element 24 furnished to be rotatable in a closing element hole of a cock body 8 with a gas inlet hole 22, a large and a medium flow pass-hole 33 and 34 are bored, while in the central part, a hollow 36 is shaped to be connected to small flow pass-holes 28. On the upper face of the body 8, pass holes 25 and 27 are bored to correspond to the pass holes 33 and 34, while on the upper face of this hole-bored part, an orifice plate 13 with orifices 13a and 13b to be determined by the sort of gas is provided. This plate 13 is fast fixed via an orifice holder 12 and a packing 14 by fastening a pilot body 9. At this stage, members 12 and 13 are mounted by fitting concave parts (a) provided on their sides to projections (b) of the body 8. |
