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LECO Corporation, founded in 1936 by Carl Schultz and George Krasl, operates its analytical instrumentation research and development, and manufacturing from its headquarters located in St. Joseph, Michigan. [3]
See also priming. Check valve Clack valve Clack from the noise it makes. A non-return valve where the feedwater enters the boiler drum. They are usually mounted halfway along the boiler drum, or else as a top feed, but away from the firebox, so as to avoid stressing it with the shock of cold water.