The common species and introduced threaded fittings

　　Generally speaking, the screw thread pipe fittings has two, one is pipe screw thread pipe fittings, pipe faucet, pipe outside the wire, pipe single head wire, tubing thread leather pipe joint and the thickness and length can be according to customer demand for tailor-made, the surface is polished disposal; another is casting screw thread pipe fittings, commonly known as the albino fittings, internal thread elbow, hexagonal wire, hexagonal leather pipe joint, internal thread three-way, inner thread woggle joint, internal thread plug, screw hat, complement core, different diameter tee, different diameter size number one cohesion is threaded connection.

　　Screw thread pipe fittings according to the use can be divided into the following categories:

　　1, for the pipe connected fittings: flange, union, Guan Gu, card sets, hoop drawing three.

　　2, to change the direction of the tube pipe fittings: elbow, elbow.

　　3, change the diameter of the pipe fittings: reducer （reducer）， reducing elbow, pipe, reinforcing pipe.

　　4, increase the pipe branch pipe fittings: three links, four links.

　　5, for sealed pipeline fittings: gasket, PTFE tape, hemp, blind flange, pipe blockage, blind plate, head, welding plug.

　　6, the pipeline fittings for fixed clasp, hook, rings, bracket, bracket, pipe etc