Patent ID: 6619273
Filing Date: 2003-09-16
Classification: F02B,F02D,F02M,F17C,Y02E,Y02T,Y10T

Abstract:
A system for delivering a liquified gas to an engine, the system comprising:a holding tank configured to receive and retain liquified gas at saturated conditions; a valve device in fluid communication with the tank, the valve device comprising: a housing defining a first chamber and a second chamber, the first chamber configured to receive liquified gas from the tank and the second chamber configured to receive liquified gas vapor from the tank; a proportioning spool disposed between the first and second chambers, the spool including a head portion disposed in the second chamber and a stem portion that extends into the first chamber; a shunt port in the stem portion, the port communicating with a shunt channel that passes through the head portion; a shunt check valve in the shunt channel for regulating the flow of liquified gas through the shunt channel; and means for positioning the spool within the first and second chambers; and a vaporizer in fluid communication with the valve device and adapted to direct liquified gas vapor to an engine; wherein the valve device is adapted to proportion fluid flow toward the engine between an all gas phase fluid comprising liquified gas vapor and an all liquid phase fluid comprising liquified gas, while directing available excess liquid phase fluid back to the tank for maintaining an operating pressure therein.