A pipe fitting is a part that joins a pipe into a pipe.  According to the connection method, it can be divided into four types: socket pipe fitting, threaded pipe fitting, flanged pipe fitting and welded pipe fitting.  Mostly made of the same material as the pipe.  There are elbow (elbow pipe), flange, three-way pipe, four-way pipe (crosshead) and reduced pipe (size head), etc.  A bend used for turning a pipe;  The flange is used to make the pipe and the pipe connected with each other, connected to the pipe end, the three-way pipe is used for the place where the three pipes are collected;  The four-way pipe is used for the place where the four pipes converge;  A reduced pipe is used where two pipes of different diameters are joined.  

Varieties of water supply pipe fittings  

In the past, the pipes used for water supply were mainly cast iron pipes.  The main outdoor sand cast iron pipe, indoor use is galvanized cast iron pipe, can be divided into cold (electric) galvanized and hot galvanized two kinds.  There are three main categories of pipelines in use.  The first type is metal pipe, such as hot - plated cast iron pipe lined with plastic, steel pipe, stainless steel pipe, etc.  The second type is plastic complex metal pipe, such as plastic complex steel pipe, aluminum composite pipe and so on.  The third type is plastic pipe, such as PP - R(crosslinked polypropylene high density mesh engineering plastic).  

Comprehensive performance requirements of water supply pipeline: as a water supply pipeline, sanitation, safety, energy saving and convenience are required.  Therefore, to examine a pipeline, we should start from four aspects.  Sanitation: Pipes and fittings shall be free from any damage to human body.  Safety: sufficient strength and excellent mechanical properties, aging resistance, heat resistance and other properties.  Energy saving: smooth inner wall, corrosion resistance, low resistance to fluid, good insulation performance.  Convenience: convenient connection and construction, reliable, with the possibility of popularization and use.