Abstract: A pressure maintaining system for a hydrogen storage system includes a hydrogen supply feed that enables a hydrogen flow from the hydrogen storage system. A liquid phase hydrogen feed enables a liquid phase hydrogen flow to the hydrogen supply feed. A gas phase hydrogen feed enables a gas phase hydrogen flow to the hydrogen supply feed. A check valve enables fluid communication from the hydrogen supply feed to the liquid phase hydrogen feed when a pressure within the hydrogen supply feed is greater than a threshold pressure.

Abstract: LPG storing cylinder (1) has a top portion fixed to a valve block (2) provided with a through hole (4) for attaching a gas take-out nozzle (3). The gas take-out nozzle (3) is attached to the through hole (4) as it is urged with an urging spring (6) for valve closing. A gas take-out passage (7) within the gas take-out nozzle (3) communicates with the nozzle attaching through hole (4) by a window hole (8). A sealing ring (10) is fitted into a portion where the window hole (8) is formed to shut off a communication between an interior area of the gas storing cylinder (1) and the gas take-out passage (7). A guide pipe (12) to communicate the interior area of the cylinder with a valve chamber (5) projects from an inner end wall of the valve block (2) into the interior area of the LPG storing cylinder (1).