A flapper valve includes a valve body, a valve cover pivotally coupled to the valve body at a hinge between an open and closed position, and a biasing element biasing the valve cover to the closed position. The valve cover includes an interior face comprising a sealing surface and a boss including a face surrounded by a beveled edge joining the boss with the sealing surface.
申请公布号
AU2012217979(B2)
申请公布日期
2016.03.31
申请号
AU20120217979
申请日期
2012.02.13
申请人
SCHLUMBERGER HOLDINGS LIMITED (SHL)
发明人
MACRAE, JONATHAN;FINCI, BULENT;PEDRAZA, JAIME;SCHIEL, MARK;PORTER, ROBERT CRISPIN