Final answer:
The throttle valve in a float-type carburetor is located between the venturi and the engine intake manifold. It regulates the airflow entering the engine.
Step-by-step explanation:
In a float-type carburetor, the throttle valve is located between the venturi and the engine intake manifold. It is a pivoting plate or a circular disc that regulates the airflow entering the engine. The throttle valve is directly connected to the accelerator pedal, allowing the driver to control the engine's speed and power output.