| 摘要 |
A flow control device is disclosed which comprises a flow path, a compensation chamber and a regulator assembiy which defines a first surface which is expcsed to the flow path and an opposing second surface which is exposed to the compensation chamber, wherein a drive arrangement Is provided for moving the regulator assembly to vary the flow path. in some embodiments fluid flowing through the flow path establishes a pressure which varies across the first surface of the regulator assembly, and the compensation chamber is in pressure communication with a localised region of the first surface which is selected to establish a compensation chamber pressure which acts against the second surface of the regulator assembly to bias the reguiator assembly in a desired direction. in some embodiments the first surface of the regulator assembly defines a profiie which is configured to minimise the variation in pressure applied over said first surface by action of fluid flowing through the flow path. |
