Bonnets: The interior elements of a gate valve are protected by a bonnet. It is screwed or fastened into place on the valve body, forming a leak-proof seal. As a result, it may be removed for repairs or maintenance. Gate valves can have screw-in, union, fastened, or pressure seal bonnets, depending on the application.
Screw-in Bonnets: Screw-in bonnets are the most straightforward to make. They're commonly found in tiny valves and create a long-lasting leak-proof seal.
Union Bonnets: A union nut holds union bonnets in place. The union nut screws into the threads of the valve body and rests on the lower edge of the bonnet. This design prevents the leak-proof seal produced by the nut from deteriorating due to repeated bonnet removal. As a result, union bonnets are frequently used in applications that need routine inspection or repair.
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