The valve cover is the cover plate of the opening in the valve body, and is the second most important valve part in the pressure valve. Like valve bodies, bonnets are also designed in different shapes and sizes.
The bonnet is of the same cast material as the body as the cap on the body. It is usually attached to the body with threads, bolts or welded joints. During the manufacture of the valve, internal components such as the stem, valve plate, etc., are placed into the valve body, and then the bonnet is attached to hold everything inside.
In all cases, the connection of the bonnet to the body is considered a pressure boundary. This means that the welded joints or bolts connecting the bonnet to the valve body are the pressure maintaining components. The bonnet, while a must for most valves, is still a concern. Bonnets complicate valve manufacturing, increase valve size, represent a significant portion of valve cost, and are a source of potential leakage.

Bonnet stainless steel investment casting
Stainless steel casting is an investment casting process that offers many benefits when used to produce precision components such as valve covers. The stainless steel investment casting process can help save costs while obtaining bonnets with OEM service. Here are some of the benefits you can get when manufacturing bonnets through the stainless steel casting method.

durability

One of the greatest advantages of stainless steel bonnets over bonnets made of other types of metals is that they are extremely durable and strong. The cast stainless steel bonnet can be used in any type of temperature and will not have any problem in extreme hot or cold temperatures. When a company chooses to purchase high-quality cast stainless steel bonnets, they can count on them to perform well and stay in great condition for a long time. Considering how durable and long-lasting stainless steel bonnets are, they are a very good investment and will be affordable in the long run.

no corrosion

Cast stainless steel bonnet is not prone to rust or corrosion. This makes cast stainless steel bonnets the first choice for industrial applications where rapid rust or corrosion of the metal may occur. While cast iron bonnets are also less prone to rust or corrosion, they do not have the strength, durability, or high pressure resistance of cast stainless steel bonnets.

design flexibility

At JC Casting, we have an unlimited selection of stainless steel grades, giving you the flexibility to configure your castings to your needs. This includes even very complex shapes or hollow section parts, helping to configure it in a robust and repeatable way. This flexibility also comes with the ability to make changes more quickly from design time to seeing the finished product in less time. Also, stainless steel investment casting is an iterative process that efficiently produces valve covers. This is because a single mold is created, making the process more repeatable and efficient when creating multiple castings.