Carl M. Cummings Manufacturing Company

Carl M. Cummings Manufacturing Company (CMC) is a machining and valve manufacturing business and a division of Maven Engineering Corporation. Tracing its roots to the 1920s (including a connection to TRW), CMC continued manufacturing valves after TRW spun off its valve product line in 1960, using the same technology. CMC valves and related products are used in locomotive, marine, and industrial engines worldwide, with a focus on ensuring optimum engine performance through quality and reliability. The company’s manufacturing process includes flash welding the valve head and stem using a computer-controlled flash welder and fiber optics to measure heating temperature, and it forges pre-forms to refine grain structure and improve metal properties. CMC supplies a full range of valve and related components for ALCO®, EMD®, and GE® engines, including engine valves, valve seats and guides, and multiple related parts such as push rods, springs, and lash adjuster components. Based in Rockville, Maryland, CMC serves Class 1 railroads, major North American engine rebuilders, and many locomotive operators worldwide.

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