公开(公告)号：US11414956B1

公开(公告)日：2022-08-16

申请号：US17191159

申请日：2021-03-03

申请人： John Burris ,  James Sloan ,  Ronald Garr

发明人： John Burris ,  James Sloan ,  Ronald Garr

IPC分类号： E21B34/08 ,  E21B43/12

摘要： An injection valve including a primary valve having a flapper, a flapper seat configured to seat the flapper, and a flow tube disposed to move relative to the flapper and thereby cause the flapper to be unseated from the flapper seat, a secondary valve disposed within the flow tube, the secondary valve including a secondary housing, and an openable and closable flow port through the secondary housing, and an annular pressure-drop ring disposed between the secondary housing and the flow tube.