Bracket - on the valve bonnet or valve body, used to support the valve stem nut or parts of the drive device.
Upper seal - a sealing structure that prevents medium from leaking from the stuffing box when the valve is fully open. Not all types of valves have upper sealing structures, such as ball valves, plug valves, butterfly valves and some automatic valves. When the valve requires an upper sealing structure, a sealing seat is usually installed on the valve bonnet or a sealing surface is processed on the valve bonnet, which together with the sealing surface on the valve stem form a sealing pair.
In addition to the common valve parts and structures mentioned above, there are also handwheels, handles or other driving devices, gaskets, screw plugs, pins, springs and other valve parts or components.
