Patent ID: 9175225
Filing Date: 2015-11-03
Classification: C10B,F16K,Y10S

Abstract:
1. A mode-shifting apparatus in a fluid jet decoking tool, said apparatus comprising: a diversion plate configured to provide selective fluid communication between a source of pressurized decoking fluid and a first nozzle and a second nozzle; a control rod coupled to said diversion plate; a shifting mechanism comprising an actuator sleeve cooperative with said diversion plate through said control rod such that a change in decoking fluid pressure imparted to said apparatus produces selective rotary movement in said diversion plate; and a biasing member comprising a first axially-biased spring and a second axially-biased spring that are each responsive to changes of said decoking fluid pressure such that said first spring maintains said diversion plate and said decoking tool in a state of axial separation during at least a portion of time that corresponds to an increase in pressure in said source of pressurized decoking fluid present at said diversion plate, while said second spring cooperates with said control rod and said shifting mechanism to rotate said diversion plate during said increase in pressure.