Abstract: Embodiments of a flow system are provided. The flow system includes a flow source device configured to receive fluid from a first flow line and output fluid on a second flow line. An output is in fluid communication with the flow source device on the second flow line. An actuation system is in fluid communication with the second flow line through a third flow line. A flow meter measures a flow rate in the second flow line without bypassing any fluid to the first flow line. A controller is in communication with the flow source device and the flow meter. The controller adjusts the flow source device to achieve a desired flow rate at the output based on a condition of the flow source device and the flow rate measured by the flow meter.

Abstract: The subject matter of this specification can be embodied in, among other things, a method that includes providing a fluid at a fluid inlet fluidically connected to an input fluid path, providing a fluid outlet fluidically connected to an outlet fluid path, fluidically connecting the inlet fluid path to the outlet fluid path through a valve, fluidically connecting the inlet fluid and the outlet fluid through a bypass fluid path in parallel with the valve, flowing the fluid from the inlet fluid path to the outlet fluid path through the valve and the bypass fluid path at a regulated fluid flow rate, restricting fluid flow in the bypass fluid path with a first orifice, restricting fluid flow in one of the fluid inlet path or the fluid outlet path with a second orifice, and providing the fluid at the fluid outlet at an outlet fluid flow rate.

Abstract: The subject matter of this specification can be embodied in, among other things, a method that includes providing a fluid at a fluid inlet fluidically connected to an input fluid path, providing a fluid outlet fluidically connected to an outlet fluid path, fluidically connecting the inlet fluid path to the outlet fluid path through a valve, fluidically connecting the inlet fluid and the outlet fluid through a bypass fluid path in parallel with the valve, flowing the fluid from the inlet fluid path to the outlet fluid path through the valve and the bypass fluid path at a regulated fluid flow rate, restricting fluid flow in the bypass fluid path with a first orifice, restricting fluid flow in one of the fluid inlet path or the fluid outlet path with a second orifice, and providing the fluid at the fluid outlet at an outlet fluid flow rate.

Abstract: The subject matter of this specification can be embodied in, among other things, a fuel pressure regulator system for regulating pressure through a fuel delivery path that includes a fuel pressure regulator valve in the fuel delivery path operable to selectively provide a restriction in the fuel delivery path in response to a reference fluid pressure, a reference fluid path comprising a first orifice, a second orifice and an outlet downstream of the first orifice, the reference fluid path coupled to the fuel pressure regulator valve intermediate the first and second orifices to supply the reference fluid pressure to the fuel pressure regulator valve, and a reference fluid valve upstream of the first orifice operable to selectively provide a restriction into the reference fluid path.