Elbow is a common connection pipe fitting in plumbing installation, used for the connection of the pipe bend, used to change the direction of the pipe.
Tee is mainly used to change the direction of the fluid, used in the main pipe to branch pipe.
The flange is the part connected between the pipe and the pipe, used for the connection between the pipe end and the import and export of the equipment. The flange is a detachable connection of a group of sealing structure. The difference in flange pressure will also cause the thickness and use of bolts will be different.
The valve is a control component in the pipeline fluid delivery system. It is used to change the channel section and the direction of the medium flow. It has the functions of diversion, cut-off, throttling, check, shunt or overflow pressure relief.