Patent Number: 6,308,753

Title: System for loading and unloading fluid tanks containing hazardous fluids

Abstract: A system for transferring a hazardous fluid product from a transport tank (10) of a roadway vehicle (12) to a fixed storage tank (14). A flexible transfer hose assembly (30) has end couplings (34, 36) which are detachably connected between the transport tank (10) and storage tank (14). A gas operated product supply valve (44) is opened by pressurized gas to permit flow of the hazardous product, such as propane, from tank (10). A gas control valve (46) controls the flow of pressurized gas to gas operated product supply valve (44). Upon a separation or rupture of flexible hose (31) or couplings (34, 36), the fluid pressure of the hazardous product in hose (31) is sensed at fluid sensing chamber (94) in gas control valve (46). A reduction in sensed fluid pressure to a predetermined maximum pressure results in movement of piston (82) to the position shown in FIG. 2 in which pressurized gas from gas source (43) is vented to atmosphere to result in closing of gas operated product supply valve (44) to stop the flow of hazardous product from tank (10). FIG. 7 shows the transfer of the hazardous fluid from a storage tank (14A) to a tank (10A) of a roadway vehicle.

Inventors: Nimberger; Spencer M. (Houston, TX), Ward; Robert L. (Missouri City, TX)

Assignee: PGI International, Ltd.

International Classification: B67D 5/32 (20060101); F16L 55/10 (20060101); F16K 031/00 ()

Expiration Date: 10/30/2018