Abstract: A press-fitting includes a body, a jacket, a seal ring and a plastic check ring. The plastic check ring has an annular convex portion, one end of the jacket has an inward wall for clamping with the inner hook, the body has a seal groove and a serrated groove with fillets on its core portion. The seal ring is disposed in the seal groove with the outer diameter of the seal ring being smaller than or equal to the outer diameter of the core portion. The press-fitting according to the present invention is of simple structure, and is convenient and quick to be assembled, and can be inspected, and is safe on seal coupling.

Abstract: A press fitting includes a pipe connector, a nipple, a check ring, a sealing ring, a pressure sleeve. The pressure sleeve is locked within the check ring, which has an inlet groove, a positioning annular groove connected with the inlet groove, and the positioning annular groove has larger internal diameter than that of the inlet groove. The pressure sleeve has an extension section on its end, and the dimension of the external diameter of the larger-diameter end of the extension section is between the dimension of the internal diameter of the inlet groove of the check ring and that of the internal diameter of the positioning annular groove of the check ring. The press fitting involves good coaxiality between the pressure sleeve and the check ring, good fixity of the pressure sleeve, and can be operated easily and utilized widely in industrial applications.