Patent ID: 7028489

Claim:
A dual purpose recirculation valve system for a cryogenic vessel, said cryogenic vessel defining a storage space, with a pressure monitoring device structured to monitor the pressure in said storage space, an electronic control system structured to receive input from said pressure monitoring device, said dual purpose recirculation system comprising: a fill line, structured to be coupled to a bulk tank, whereby said storage space is filled with a cryogenic fluid; a delivery line assembly having a delivery coupling assembly, said delivery line assembly structured to remove said cryogenic fluid from said storage space and deliver said cryogenic fluid to said delivery coupling assembly; a recirculation line extending between, and in fluid communication with both, said fill line and said delivery line assembly; and a recirculation valve disposed on said fill line at a location between said recirculation line and said storage space, said recirculation valve structured to close when said cryogenic vessel pressure exceeds a set limit.