| 摘要 |
<p>TITLE: TURBINE Nozzles, which direct working fluid into the blades of a rotor, are divided into a plurality of groups with the nozzles in each group communicating with a respective radial port in a tubular valve seat. A cylindrical valve member is movable axially of the valve seat to open or close the ports in succession, thereby achieving nozzle-governed operation of the turbine. The valve seat is removably mounted between a casing cover and a pressure vessel and can be replaced by other valve seats having ports different in shape, size, disposition and/or number, thereby enabling the operating characteristics of the turbine to be altered.</p> |
