| 摘要 |
A flow controller 1 for fluid flow has an inlet 5 for connection to a source 2 of pressurised fluid, an outlet 6 for connection to a device 3to be supplied with fluid, and a flow restrictor 4 between the inlet and the outlet. A first pressure-responsive valve 7 controls fluid flow between the inlet 5 and the flow restrictor 4 and a second pressure-responsive valve 9 controls flow between the restrictor 4 and the outlet 6. The valves 7,9 operate in response to inlet or outlet pressure and opposing control pressure, which may be supplied from a different source 10 from the fluid whose flow is being controlled. As the valves 7,9 control the pressure on both sides of the flow restrictor, flow through it can be controlled precisely.
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