PROTECTION DEVICE OF CONNECTING PIPE COUPLING Russian patent published in 2013 - IPC F16L47/06 F16L15/00 

FIELD: machine building.

SUBSTANCE: protection device of a connecting pipe coupling includes a stepped bushing having a middle section with increased diameter and two side ones with smaller outer diameters, which is installed between end faces of pipes with a conical thread and connected by means of a coupling. Device is equipped with an additional stepped bushing; at that, the first stepped bushing has constant outer diameter and two sections with small and large inner diameters, and the second stepped bushing has constant inner diameter and two sections with small and large diameters; at that, small inner diameter of the first bushing and inner diameter of the second bushing are equal to inner diameter of connected pipes, and outer diameter of the first bushing and larger outer diameter of the second bushing are equal to inner diameter of connecting coupling. The first bushing in the section of larger inner diameter is connected to section of smaller outer diameter of the second bushing with pre-load, and value of possible movement of bushings relative to each other exceeds movement of pipe end faces at tightening of a threaded connection.

EFFECT: invention improves the connection reliability.

6 cl, 1 dwg