Pipe Union is a type of fitting equipment designed in such a way to unite two pipes which can be detached without causing any deformation to the pipes. In other words, the pipe unions can disjoint two pipes very easily. They are widely demanded in the pipe fitting market.Click to see full answer. Moreover, what is the use of union in plumbing?Generally speaking, unions are used at a fixture or appliance where removal or maintenance is expected. The union facilitates disconnection of the fixture/appliance without cutting, soldering or unthreading pipe.One may also ask, what is the difference between a coupling and a union? The basic difference between a coupling and a union is that a coupling is for joining pipe to pipe or pipe to a swedge. A union is made for joining and disassemble of a part of a piping system (a steam trap or control valve, etc) for maintenance or replacement. Likewise, what is a coupling in plumbing? A coupling (or coupler) (used in piping or plumbing) is a very short length of pipe or tube, with a socket at one or both ends that allows two pipes or tubes to be joined, welded (steel), brazed or soldered (copper, brass etc.) together.What is a union joint?Union Joint. a detachable joint, formed by means of a union, that is used to connect the parts of a piping system to various tanks or machines. Besides a union, a union joint consists of a gasket, a locknut, and a reducer, such as an elbow or a coupling (Figure 1). The pipe to be connected is screwed into the reducer.

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