| 摘要 |
<p>A meter calibration apparatus includes a fluid intake conduit, a fluid discharge conduit, and a calibration cylinder connected in fluid communication with the intake and discharge conduits, the calibration cylinder defining a chamber. The apparatus further includes a piston slidable within the cylinder and defining first and second chamber portions on opposite sides of the piston, and at least one valve having an intake port in fluid communication with the intake conduit, a first flow port with a first flow conduit extending therefrom and connected to the first chamber portion for providing fluid communication therebetween, and a second flow port with a second flow conduit extending therefrom and connected to the second chamber portion for providing fluid communication therebetween. The valve is adjustable to selectively direct flow along one of two chamber filling flow paths, the first chamber filling flow path extending from the intake conduit, through the first flow conduit, and terminating in the first chamber portion; the second chamber filling flow path extending from the intake conduit, through the second flow conduit, and terminating in the second chamber portion; the first and second chamber filling flow paths being in fluid isolation from the discharge conduit.</p> |
