At this point they are considered incertae sedis;in other words, we know that they are theropods; and probably coelurosaurs; but we don't know who they are related to or how they fit into the big picture of theropod phylogeny.
Idle speed is adjusted by means of the idle control valve, which is a solenoid-operated valve that is generally automatically adjusted by a computer. One problem that can occur with this component is a loss of power (from a severed line or a short) but a more common problem is simply dirt and grime.
Control Valves. A combination of a valve and an actuator is usually referred to as a control valve. The system which provides automatic control of flow consists of a valve, a valve actuator, and a sensing device. Two types of controllers and actuators commonly used in irrigation are electric and hydraulic. Globe and angle valves are commonly adapted for automatic control due to the tight shutoff of these valves.