Speed Regulated Pipeline Pig,申请号US20080167664-传众专利搜索

Speed Regulated Pipeline Pig

申请公布号：US2010000037(A1)

申请号：US20080167664

申请日期：2008.07.03

申请公布日期：2010.01.07

申请人：

TDW DELAWARE, INC.

发明人：PRUETT RICK D.;STRONG ROBERT F.;FREEMAN ERIC N.;COOPER CHARLES CULVER GIDDEN;NELSON SCOTT DOUGLAS;HENAULT MARK RUSSELL

分类号：B08B9/04

主分类号：B08B9/04

摘要：A pipeline pig includes a venturi and a modulating valve located rearward of the inlet side of the venturi. When the valve is in the open position, a predetermined maximum bypass flow is allowed through the venturi. The closed position allows a predetermined minimum bypass flow. The valve may be a poppet-style valve or a frusto-conical shaped stopper. The stopper has sufficient mass and/or aerodynamic drag to overcome the spring force holding the valve in the open position. When the pig stalls, the valve closes and the stopper chokes bypass flow through the venturi. When the pig starts running again, the valve opens as inertia forces the stopper away from the inlet side of the venturi. Also, as friction of the pig increases due to changes in the internal diameter of the pipeline or accumulation of debris ahead of the pig, increased airflow across the valve creates drag sufficient to partially overcome the spring force, thus keeping the pig moving at a desirable rate of travel.