One of the mysteries of the English language finally explained.
1A valve consisting of a disk rotating on an axis across the diameter of a pipe to regulate the flow, as in the throttles of many engines.
- ‘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.’
- ‘The most expensive single component was a large butterfly valve, which cost $7,000.’
- ‘The exhaust has a butterfly valve, which cuts in between 1,500 rpm and 3,000 rpm.’
- ‘A good thing to remember is that the operation of either of these systems uses a butterfly valve that closes off the normal induction system.’
2A valve consisting of a pair of semicircular plates that are attached to a spindle across a pipe and hinged to allow flow only one way.
- ‘This stabilizing feature is possible via Watertronics patented electronic butterfly valve technology, which also provides Lou with backup pressure regulation in the event of a VFD fault.’
butterfly valve/ˈbədərˌflī valv/
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