US Patent 7775504 Fluid flow control device

A fluid flow control device (1) comprising at least one valve, the or each valve being controlled by an electrically-operate e actuator (32), a control means (27) for controlling the actuators and a communication means (28) to provide signals for the control means (27), wherein the device (1) includes an electrical power generation means (5) to generate electricity from the flow of fluid in the control device to operate the actuators (32), the control means (27) and the communication means (28). The device does not require an external electricity supply as it generates its entire electricity requirement locally. The device (1) may also receive instructions wirelessly to control the at least one valve.