The diameter of the cap is higher than that of the

The diameter of the cap is higher than that of the head  

Pipe cap, also known as plug, cap, pipe cap, head, installed on the pipe end of the external thread to cover the pipe fitting.  Used to seal the pipe, the function is the same as the pipe plug, but the pipe cap can be directly screwed on the pipe, no other pipe fittings are required.  It is generally used for sampling port at the end of the pipe. After sampling is completed, it is necessary to screw the pipe cap. Secondly, in special circumstances, after screwing off the pipe cap, the wire mouth can be connected to the pipe, and temporary continuous feeding or pumping.  The tube cap is generally used in the case of low pressure, which is easy to disassemble and repair. In the case of high pressure, the tube cap is generally not needed.  The pipe cap includes convex pipe cap, cone shell, reducer section, flat cover and the design of tightening mouth.  

The pipe cap and the head shape is similar, the material is stainless steel, the pipe cap size is relatively small, can be forged;  The head size is larger, and it is generally pressed with steel plate. The pipe cap is generally used for the end of the pipe. The head is used for the upper and lower parts of the container equipment (vertical equipment) or the left and right ends (horizontal equipment).  Convex pipe cap includes: hemispherical pipe cap, oval pipe cap, disc pipe cap and dome pipe cap.  From the point of view of force, convex pipe cap is gradually bad from the hemispherical pipe cap, but from the point of view of manufacturing difficulty, gradually good manufacturing.  

Casing) cap, also known as head, plug, cover, pipe cover, head, fitting welded to the end of the pipe or fitted to the external thread of the end to cover the casing.  Used to seal the pipeline, the function is the same as pipe blocking.  

Cap is higher than head, head no neck, the cap has a neck, see the head the radian that he is, out in the diameter is the head, but the pipe cap, pipe cap need radian, the out diameter on to a piece, a piece of neck, this is the pipe cap, pipe cap more expensive than head, but the cap is better than the head, this is the difference between head and pipe cap,  I believe to tell you these, you can judge what is the head, what is the tube cap, I hope to help you. &n