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Precision CNC Milling & Turning of a Steel Throttle Bonnet Valve for Steam Turbines

Throttle Bonnet Valve

Since 1966, Westboro Machine has provided complex manufactured components to customers throughout the United States. We operate state-of-the-art CNC turning, milling, and inspection equipment that produce the highest quality parts possible. Our machinists provide precise turning and milling operations for a variety of materials including steel, brass, bronze, aluminum, copper, plastics, and others.

In this project, our customer required a throttle bonnet valve for steam turbines machined from 1117HR carbon steel. Careful machining and tap sizing were necessary in order to prepare the parts for nickel plating. Inspection and verification took place throughout the entire process before setup, after operation, and after plating. Each valve was made using an Okuma Cadet CNC turning center and HAAS 3-axis Mini-Mill. It was then nickel plated and delivered to our customer on time.

The customer was extremely pleased with our work and continues to do business with us today. As a full-service CNC machine shop, we provide an array of services that include prototyping and specialty manufacturing. We can also provide secondary services such as heat treating, grinding, anodizing, painting, and coating. For 49 years, our family-owned company has offered high quality, specialty, and made-to-order parts to a variety of industries. Our loyal customer base always depends on our team to field superior service and produce quality products regardless of their complexity. To learn more about our ability to CNC machine intricate components for high-value assemblies, please contact us or refer to the table below.


Steel Throttle Bonnet Valve Project Highlights

Project Name & Description
Throttle Bonnet Valve
Capabilities Applied/ Processes
CNC Lathe & Milling

Electroless Nickel Plating
Equipment Used to Manufacture Part
Okuma Cadet Lathe, HAAS Mini Mill
Overall Part Dimensions
4-1/4’’ diameter x 1-1/2’’ thick
Tightest Tolerances
+/- .0005
Material Used
Material Finish
Electroless Nickel Plate
In Process Testing/ Inspection Performed
Check parts at each setup / Post machining / Post plating
Delivery/ Turnaround Time
On time

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