A valve consisting of a rotating circular plate or a pair of hinged semicircular plates, attached to a transverse spindle and mounted inside a pipe in order to regulate or prevent flow.
- The exhaust has a butterfly valve, which cuts in between 1,500 rpm and 3,000 rpm.
- So today I cleaned the Automatic Idle Control valve of my Saab, and the throttle butterfly valve.
- The carburetor-heat lever turns a butterfly valve in the air-induction systems that bypasses the normally filtered air, allowing warm air to directly enter the carburetor body.
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