Patent ID: 7404416

Claim:
An apparatus for creating a pulsating fluid flow, comprising: an inlet into which fluid flows, a chamber having an upstream end and a downstream end, wherein the chamber is defined by a pair of outwardly-projecting sidewalls and wherein the inlet is disposed at the upstream end of the chamber, at least two feedback passages having opposed entrances at the downstream end of the chamber and opposed exits at the upstream end of the chamber near where the chamber joins the inlet, a feedback cavity disposed at the downstream end of the chamber, and at least one exit flowline leaving each of the feedback passages, wherein the at least one exit flowline has an exit port; wherein a pulsating fluid flow is generated through the exit port; and wherein the inlet, the chamber, the at least two feedback passages, the feedback cavity and the at least one exit flowline leaving each of the two feedback passages are disposed on a half mandrel.