| 摘要 |
A valve comprising a valve body (10) having inlet (14) and outlet (18) passages communicating with a valve chamber (15). A valve element (90) is movable through the valve chamber adjacent a valve seat (92) and a flow deflector ring (104) having a central opening which has discontinuous deflector surfaces (106) around a central opening separated by spaced grooves (108) arranger to disrupt flow a stream of fluid flowing between the valve element and the valve seat to prevent the formation of a vena contracta downstream from the valve seat. A plurality of sleeves (34,36) having cylindrical walls divide the valve chamber to form an entrance section (15a) and an outlet section 15b). An array of inlet bores (38) is formed in an outer sleeve (34) and an array of exit bores (40) is formed in an inner sleeve (36), each of the bores having a receiving end and a discharge end, receiving ends of bores in the array of outlet bores being spaced axially of the valve chamber relative to discharge ends of bores in the array of inlet bores. Bores in the array of inlet bores are inclined relative to bores of the array of exit bores to form a tortuous flow path from the inlet section through a plurality of axially spaced plenums (44,46,48) to the outlet section 15b) of the valve chamber (15) to minimize noise and cavitation as pressure is reduced in the valve chamber.
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