The Double Female Ball Valve in aluminium compressed air pipelines is a specially designed valve that is mainly used to control the flow of compressed air in pipelines. Its distinctive feature is that both connecting ports of the valve (usually the inlet and outlet) are designed with internal threads (female filaments) to allow for connection to piping or connections with corresponding external threads. This double female thread design makes installation and maintenance much easier as there is no need for welding, flanging or other complicated connections. Simply rotate the pipe or connection with the external thread to the internal thread of the ball valve. Aluminium alloy as the material of choice gives the double female ball valve a range of advantages, such as lightweight, corrosion resistance and good thermal conductivity. These features make the aluminium alloy double female ball valve very popular in compressed air piping systems, especially where frequent operation or maintenance is required.