Anti-dropping steel ring used in press-fitting type pipe fitting and fixing sealing device

An anti-dropping steel ring used in a press-fitting type pipe fitting, the anti-dropping steel ring comprising:

• first snapping parts and second snapping parts distributed in a circumferential direction,
• the first snapping part being configured to extend from an inner circumferential wall of the anti-dropping steel ring in a radial direction, and
• the second snapping part being configured to extend from a circumferential edge of the anti-dropping steel ring in an axial direction and lean inwards;
• wherein the anti-dropping steel ring is provided with a first interface part and a second interface part,
• the first interface part is a convex part,
• the second interface part is a concave part that can accommodate the convex part, and
• the first interface part and the second interface part are configured to implement closing of the anti-dropping steel ring by means of cooperation of the concave part and the convex part;
• wherein both the first interface part and the second interface part are configured to be V-shaped to prevent the anti-dropping steel ring from being dislocated.