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The bonnet is the cover of the opening in the valve body and is the second most important valve component in the pressure valve. Like the valve body, the bonnet is designed in different shapes and sizes. The valve cover is of the same casting material as the valve body and serves as the cover on the valve body. It is usually attached to the body by threaded, bolted or welded joints. During valve manufacturing, internal components such as the stem, disc, etc. are loaded into the valve body, and then the bonnet is installed to hol... more