Threaded connection is mainly suitable for small diameter pipes. When connecting, it is generally necessary to wrap a fluorine plastic sealing tape on the threaded connection part, or apply a thick paint, wind hemp and other sealing materials to prevent leakage. When the pressure is above 1.6 MPa, the end of the pipe is generally sealed with a gasket. This connection method is simple and can be disassembled and reassembled, but the union must be installed in the appropriate place of the pipeline to facilitate disassembly and assembly.
