air-valve carburetor

air-valve carburetor
A type in which a spring-closed or weight-closed air valve opens in response to engine demand. This valve, through suitable linkage, varies the fuel-orifice opening to secure the desired mixture ratio throughout the range of operation. SU and Stromberg CD carburetors operate on this principle, referred to also as constant-vacuum, constant-depression, or variable-venturi.
Also see
constant-vacuum carburetor

Dictionary of automotive terms. 2015.

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