Patent ID: 9581295
Date: 2017-02-28
CPC Classifications: F17C

Claim:
1. A cryogenic fluid delivery system, comprising: a pressure vessel containing a cryogen formed of a liquid and a vapor located above the liquid; a withdrawal line configured to deliver the cryogen to a use device that is an engine of a vehicle; a liquid tube extending into the liquid and connecting the liquid with the withdrawal line via a check valve assembly positioned between the liquid tube the and the withdrawal line, wherein a first pressure in the pressure vessel forces liquid into the withdrawal line via the liquid tube and the check valve assembly when the withdrawal line is open; a vapor line extending into the vapor and connecting the vapor with the withdrawal line; a back-pressure regulator coupled to the vapor line, wherein the back-pressure regulator opens the vapor line when a second pressure in the system exceeds a predetermined value so as to permit vapor to pass through the vapor line to the withdrawal line; a pressure relief valve coupled to the withdrawal line, wherein the pressure relief valve exerts a back pressure on the liquid tube such that a path of least resistance for cryogen out of the pressure vessel into the withdrawal line is through the vapor line whenever the back-pressure regulator is open; a check valve assembly that fluidly connects the liquid tube to the withdrawal line, the check valve assembly including: