Patent attributes
A dual purpose recirculation valve system for a cryogenic vessel includes a fill line, a delivery line assembly, a recirculation line and a recirculation valve. The cryogenic vessel defines a storage space and includes a pressure monitoring device structured to monitor the pressure in the storage space, as well as an electronic control system structured to receive input from the pressure monitoring device. The fill line is structured to be coupled to a bulk tank, whereby the storage space is filled with a cryogenic fluid. The delivery line assembly has a delivery coupling assembly and the delivery line assembly structured to remove the cryogenic fluid from the storage space and deliver the cryogenic fluid to the delivery coupling assembly. The recirculation line extends between, and is in fluid communication with both, the fill line and the delivery line assembly. The recirculation valve is disposed on the fill line at a location between the recirculation line and the storage space, the recirculation valve structured to close when the cryogenic vessel pressure exceeds a set limit. In this configuration, the recirculation valve acts as both a recirculation valve and as a valve to avert over-pressurization during a fill.
