US Patent 7510171 Fuel conditioning apparatus

A fuel conditioning system has a housing defining a chamber and provided with an inlet upstream of the chamber and an outlet downstream of the chamber. A hemispherical seat has a first end in communication with the inlet, and a second end in communication with the chamber. A valve body is moveable between a closed position and an open position where the valve body is spaced from the inlet to allow air to flow into the chamber. A biasing device biases the valve body toward the closed position.