Abstract
Variable area cage, contoureed plug and multi-hole cage valves are tested over a range of pressure reduction from 0.1 to 5 MPa. The valve size is almost 100 in Cv value. Acceleration data at the wall are analyzed in the frequency range over 100 kHz, introducing the following representations: ( a ) Rice frequency as a center frequency to find the incipience, and ( b ) spectrum amplification to determine the critical stage. The choking is determined by the data of pressure fluctuations in the pipe. The three limits show a power law correlation between the cavitation number and the discharge coefficient. Cavitation pictures taken at a low pressure condition are also presented for the clarification of the bubble configurations.
