Axial flow regulator improvements including restrictor

An apparatus including a restrictor for installation on the downstream side of an axial flow regulator which flow regulator includes a central plug diverting fluid flow into an annular space thereabout, said regulator having an annular housing having inlet and outlet body elements received therein, said body elements each defining a plurality of integral spaced ribs forming opposed cage elements for retention of said central plug therebetween, said body elements defining cylindrical inlet and outlet openings, locking opening means being defined in the downstream one of said body elements, the restrictor comprising:

• a surrounding cylindrical sleeve defining a solid circumferential wall forming a close fit within said outlet opening of said downstream body element a plurality of fluid flow openings being formed in said cylindrical wall to thereby define a maximum throughput capacity, said restrictor further including a generally conical central closure member being integral with said cylindrical wall and extending across and within said cylindrical wall to close off an axial flow path there through an annular seal groove being formed in the outer peripheral portion of said restrictor and opening toward said plug, seal means received in said seal groove and establishing a seal between said restrictor and plug, locking means extending through said cylindrical wall and into said locking opening and securing said restrictor in assembly with said downstream body element.