Apparatus and method for controlling fluid flow using pneumatically operated valve

摘要

A flow control device includes an inlet (9) for passing fluid into the device, an outlet (7) for passing fluid from the device, a pneumatic pressure controlling portion (5), a fluid flow control valve (2) actuated by pneumatic pressure supplied via the pneumatic pressure controlling portion, a flow meter (3) configured to measure flow rate of the fluid, and a controller (4) configured to control the pneumatic pressure controlling portion at least according to the flow rate measured by the flow meter. Actuation of the fluid flow control valve may cause adjustment of the flow rate.