1963, The PCV Valve, a "Green" Breakthrough

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Date

ca. 1966

Location

Not Applicable

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GM researchers identified engine blow-by gas as a major source of hydrocarbon emissions and developed the Positive Crankcase Ventilation valve, commonly known as the PCV valve, to cap the leak. Made standard on all GM cars sold in the U.S. beginning in 1963, it was the industry’s first vehicle emissions control device.

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