Patent ID: 7293804

Claim:
A press fitting, comprising a pipe connector, a nipple, a check ring and a sealing ring, a pressure sleeve, wherein said check ring is sleeved into an end groove at the end section of said nipple of said pipe connector, said sealing ring is fit to a sealing groove of said nipple, said pressure sleeve is locked within said check ring, said check ring has an inlet groove and a positioning annular groove which is connected with said inlet groove, said positioning annular groove has a larger internal diameter than that of said inlet groove; said pressure sleeve has an extension section on its end, the dimension of the external diameter of the larger-diameter end of said extension section is between the dimension of the internal diameter of said inlet groove of said check ring and that of the internal diameter of said positioning annular groove of said check ring, said extension section is trumpet-shaped, the section from the first sealing groove to the free end of said nipple is ripple-shaped, and the remaining section of said nipple is serrate-shaped.