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
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. We
also use Deloro Stellite alloys for hardfacing of
valves used in severe wearing environments. Working
closely with laboratories at Deloro Stellite, we
employ only the latest facing materials and equipment
Most valves are made by a process of pushing material
through a die which interrupts the original grain
flow of the material. This weakens the valve head
and makes it more susceptible to surface corrosion.
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, such as strength,
ductility and toughness.
CMC stamps all of its valves on the stem with identification
that enables us to trace the material certification,
heat treat certification, process and inspection
reports for that valve. CMC also warrants all of
its valves to be free of material defects and for
workmanship for a period of three years.
Click here for a copy of our standard warranty.
We invite you to explore our website. You will find
our full line of Marine and Locomotive valves for
and GE® engines. We also
supply a full array of Industrial
parts for brands such as Caterpillar®,
Sales and Product Information please contact:
Carl M. Cummings Manufacturing Company
2818 "A" Metropolitan Place