Control valves for waterjet systems and related devices, systems, and methods

A waterjet cutting system, comprising:

• a fluid conveyance having an internal volume, the fluid conveyance being configured to convey a fluid within the system;
• a fluid-pressurizing device operably connected to the fluid conveyance;
• a control valve operably connected to the fluid conveyance downstream from the fluid-pressurizing device, the control valve including—
• a seat having a passage and a tapered inner surface within the passage, and
• a pin operably associated with the seat, the pin having an outer surface complementary to the tapered inner surface;
• a controller operably associated with the control valve;
• and
• a cutting head including a jet outlet,
• wherein the control valve is configured to move the pin, in response to one or more first signals from the controller, between a shutoff position and two or more open throttling positions to throttle the fluid between the tapered inner surface of the seat and the outer surface of the pin to vary one or more flow characteristics of fluid passing through the control valve.