Originally a division of TRW, CMC is now a subsidiary of Maven Engineering Corporation. We use a unique process to manufacture our valves, whereby the valve head and stem are flash welded. This reduces the possibility of cracking or breaking – distinguishing our valves from those of our competitors. We use a computer-controlled flash welder to accurately control every phase of the heating and upset/forging phase of the welding operation. We also use Fiber Optics to accurately measure the temperature of the tip during heating, which ensures optimum quality in the manufacturing process.

At CMC, we understand that superior grain flow provides the strongest valve heads available. Our steel is heated by electrical resistance between two contacts and forced through the contacts by a hydraulic ram until enough volume is “upset” to make the pre-form. The pre-form is then passed immediately to the forge. Forging refines the grain structure and improves physical properties of the metal (strength, ductility and toughness).

As part of our ISO 9001:2008 Quality Management System, CMC stamps all of its valves on its stem with identification that enables us to trace the material and heat treat certifications, process and inspections reports for each valve.

Click here for a copy of our standard warranty.

Originally a division of TRW, CMC is now a subsidiary of Maven Engineering Corporation. We use a unique process to manufacture our valves, whereby the valve head and stem are flash welded. This reduces the possibility of cracking or breaking – distinguishing our valves from those of our competitors. We use a computer-controlled flash welder to accurately control every phase of the heating and upset/forging phase of the welding operation. We also use Fiber Optics to accurately measure the temperature of the tip during heating, which ensures optimum quality in the manufacturing process.

At CMC, we understand that superior grain flow provides the strongest valve heads available. Our steel is heated by electrical resistance between two contacts and forced through the contacts by a hydraulic ram until enough volume is “upset” to make the pre-form. The pre-form is then passed immediately to the forge. Forging refines the grain structure and improves physical properties of the metal (strength, ductility and toughness).

As part of our ISO 9001:2008 Quality Management System, CMC stamps all of its valves on its stem with identification that enables us to trace the material and heat treat certifications, process and inspections reports for each valve.

Click here for a copy of our standard warranty.

Originally a division of TRW, CMC is now a subsidiary of Maven Engineering Corporation. We use a unique process to manufacture our valves, whereby the valve head and stem are flash welded. This reduces the possibility of cracking or breaking – distinguishing our valves from those of our competitors. We use a computer-controlled flash welder to accurately control every phase of the heating and upset/forging phase of the welding operation. We also use Fiber Optics to accurately measure the temperature of the tip during heating, which ensures optimum quality in the manufacturing process.

At CMC, we understand that superior grain flow provides the strongest valve heads available. Our steel is heated by electrical resistance between two contacts and forced through the contacts by a hydraulic ram until enough volume is “upset” to make the pre-form. The pre-form is then passed immediately to the forge. Forging refines the grain structure and improves physical properties of the metal (strength, ductility and toughness).

As part of our ISO 9001:2008 Quality Management System, CMC stamps all of its valves on its stem with identification that enables us to trace the material and heat treat certifications, process and inspections reports for each valve.

Click here for a copy of our standard warranty.

Products

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About

History

Welcome to the Carl M. Cummings Manufacturing Company (CMC). Our roots go back to the 1920s, when we were part of TRW. In 1960, TRW spun off its valve manufacturing division, and CMC continued manufacturing valves with the same technology in Southern California. A subsidiary of Maven Engineering, CMC is dedicated to quality and reliability. Our valves are used in locomotive, marine and industrial engines around the world.

Manufacturing Process

To ensure the highest reliability and life span of its valves, CMC uses a unique process whereby the valve head and stem are flash welded. This reduces the possibility of cracking or breaking, and separates our valves from those of our competitors. By using a computer controlled flash welder, we can accurately control every phase of the heating and upset/forging phase of the welding operation. In addition, we use Fiber Optics to accurately measure the temperature of the tip during the heating process, ensuring optimum quality in the manufacturing process.