Patent ID: 6308753
Filing Date: 2001-10-30
Classification: B67D,F16L,Y10T

Abstract:
In apparatus for transferring a hazardous fluid product through a flexible hose assembly having opposed upstream and downstream ends detachably coupled between a tank of a roadway vehicle and a fixed storage tank, one of said tanks having a gas operated product supply valve maintained in an open position for downstream product flow to the other tank by pressurized gas from a pressurized gas source during a normal product transfer operation; a gas control assembly for controlling the supply of pressurized gas to said gas operated product supply valve; said gas control assembly comprising:a gas control valve mounted between said pressurized gas source and said gas operated product supply valve to control the supply of gas to said product supply valve; anda fluid sensing line for said flexible hose assembly for sensing the fluid pressure therein of product flowing between said tanks during normal transfer operation; said fluid sensing line having an internal portion extending downstream in said flexible hose assembly from said upstream end along at least a majority of a length of said flexible hose assembly between said upstream and downstream ends;said gas control valve having a valve member therein movable between a normal product transfer position to permit fluid flow to said product supply valve to maintain said product supply valve open, and an emergency position for exhausting gas from said gas operated product supply valve for closing of said product supply valve and stopping product flow from said tank being unloaded; said valve member responsive to said fluid sensing line and moving to said emergency position upon a reduction in fluid pressure in said fluid sensing line below a predetermined minimal fluid pressure.