| 摘要 |
<p>An orifice meter wherein a disc carrier plate (14) has two openings, one being a receptacle (56) for an orifice disc and the other a through flow port (68). When the carrier is raised for replacement of the disc, the flow port is aligned with the flow passages (22, 24). Seals (70) around the flow port seal off the flow passages so that pipeline flow may be resumed during the orifice disc replacement.</p> |
