Stainless Steel Casting of Valve Bonnet

Valve bonnet is the the cover for the opening in the body, and it is the second most important valve component of a pressure valve. Like valve bodies, bonnets are also designed in different shapes and dimensions.

A bonnet, which has the same casting material as the body, acts as a cover on the valve body. It is commonly connected to the body by a threaded, bolted, or welded joint. During manufacture of the valve, the internal components, such as stem, disk etc., are put into the body and then the bonnet is attached to hold all parts together inside.

In all cases, the attachment of the bonnet to the body is considered a pressure boundary. This means that the weld joint or bolts that connect the bonnet to the body are pressure-retaining parts. Valve bonnets, although a necessity for most valves, represent a cause for concern. Bonnets can complicate the manufacture of valves, increase valve size, represent a significant cost portion of valve cost, and are a source for potential leakage.

Stainless Steel Investment Casting of Valve Bonnet

Stainless steel casting of valve bonnet

Stainless steel casting is an investment casting process that can have many benefits when it is used to produce precision components such as valve bonnet. The stainless steel investment casting process can help to save costs while getting valve bonnets with OEM service. Here are a few of the benefits you can expect to receive when manufacturing valve bonnet by stainless steel casting method.


One of the biggest benefits that stainless steel valve bonnet have over valve bonnets made of other types of metal is the fact that they are incredibly durable and robust. Cast tainless steel valve bonnet can be used in any type of temperature and do not have any problems when used in extremely hot or extremely cold temperatures. When a company chooses to purchase high quality cast stainless steel valve bonnets, they can count on them functioning and remaining in excellent condition for a long time. Considering how durable and long-lasting stainless steel valve bonnets are, they are a very good investment that are affordable in the long run.

Free From Corrosion

Cast stainless steel bonnets are not prone to rust or corrosion. This makes the use of cast stainless steel valve bonnets the top choice for industrial applications where the conditions may cause metal to rust or corrode quickly. While cast iron valve bonnets are also not prone to rust or corrosion, they do not have the strength, durability, or resistance to high pressure that cast stainless steel valve bonnets have.

Design Flexibility

At CFS, we have an infinite choice of stainless steel grades, which gives you the flexibility to configure your cast the way you need it. This even includes very complex shapes or hollow section parts, helping configure it in a sturdy and repeatable way. This flexibility also comes with the ability to make changes more quickly with a shorter time from the design time to seeing a finished product. Moreover, stainless steel investment casting is a repetitive process, which can produce valve bonnets efficiently. This is because a mold is created, making the process more repeatable and efficient when creating multiple casts.

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