| 摘要 |
The apparatus described herein is for use in a valve including a hollow valve body having inlet and outlet passageways extending into the body and a valve member positioned in the body for movement between open and closed positions. A plurality of orifice members are disposed between the inlet and outlet so that fluid flowing through the valve must pass therethrough. The orifice members are arranged to restrict fluid flow and thus reduce the pressure as the fluid flows through the valve. The orifice members are also arranged so that the inlet to each series of members is through an annular space that is narrower than the smallest of the orifices so that any particle passing through the annular space will pass through the valve. Each inlet is provided with a cleaning member that projects therein and the orifice members are rotatable in the valve body so that the cleaning members pass through each inlet.
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