Patent ID: 8205508

Claim:
A motorless mass flowmeter having an inlet and an outlet for flow of fluid therethrough, the mass flowmeter comprising: a turbine subassembly; a drum rigidly connected to the turbine subassembly such that the drum rotates in accompaniment to rotation of the turbine subassembly; and an impeller rotationally coupled to the drum by way of a spring that allows relative rotation against the bias of the spring; wherein the turbine subassembly has a first set of jets causing a first torque to be applied about a rotational axis of the turbine subassembly as fluid flows therethrough, the first torque tending to cause the turbine subassembly to rotate in a first direction; the turbine subassembly has a second set of jets causing a second torque to be applied about the rotational axis of the turbine subassembly as fluid flows therethrough; and a first set of one or more bypass valves causing an increasing amount of fluid to be diverted from the first set of jets to the second set of jets with increasing flow of fluid through the mass flowmeter.