| 摘要 |
<p>A pipe tapping device which includes a valve conduit having a longitudinal axis, a fluid inlet portion and a fluid outlet portion, wherein the fluid inlet portion has associated therewith, a cutting edge; mounting apparatus for mounting the valve conduit onto a pipe to be tapped; and compression apparatus for bringing the cutting edge into compressive contact with an outer surface of the pipe prior to tapping of the pipe; wherein the valve conduit is selectably rotatable about the longitudinal axis, such that upon bringing the cutting edge into the compressive contact with an outer surface of the pipe, rotation of the valve conduit is operative to transfer a turning force to the cutting edge so as to cause the cutting edge to cut a preselected portion of the pipe wall, thereby to form a coupon.</p> |
