Threaded Actuated Ball Valve Connections
Male threads of various forms may be used for special purposes, but as a rule threaded end valves have female pipe threads, either tapered for assembly to taper threaded pipe or parallel for assembly to taper or parallel threaded pipe. In the case of taper to taper and taper to parallel connections, the pressure-tight joint is made on the threads. For parallel to parallel connections, the pressure tight joint is made by compressing a grummet or gasket against the end face of a valve. Threaded ends, usually confined to pipe sizes 150 mm and smaller, are widely used for bronze valves and to a lesser extent for iron and steel valves. They are not recommended for severely corrosive conditions.