公开(公告)号：US10514098B2

公开(公告)日：2019-12-24

申请号：US15351666

申请日：2016-11-15

Applicant: PETROLEO BRASILEIRO S.A.—PETROBRAS

Inventor： Paulo Koji Usuda

IPC: F16J15/08 ,  F16L25/00 ,  F16J15/12 ,  F16L23/18

Abstract: The present invention is for sealing gaskets applicable to pipes, valves and boiler equipment. In this context, the present invention provides a sealing gasket for piping systems comprising (i) a core (10) formed by a plurality of concentric metal rings (10a), each ring (10a) comprising a substantially rectangular cross-section, wherein the height of the rectangular cross-section is the same for all the rings (10a), and (ii) surface coating (12) of flexible material applied to the upper and lower surfaces of the core (10). The present invention also provides the manufacturing process of said sealing gasket. Thus, the present invention provides a sealing gasket (i) that eliminates the need for an external rigid ring, (ii) that is easy to conform for reduced-diameter sealing gaskets and (iii) can be easily formed into different shapes, such as an oval shape, which is particularly useful for sealing between the body and the gate valve bonnet.