A hydrogen fuel dispenser includes a pre-cooling circuit, a hydrogen fuel storage for storing hydrogen fuel, a nozzle for dispensing hydrogen fuel to a receptacle, and a fueling line connecting the hydrogen fuel storage to the nozzle for communicating hydrogen fuel from the hydrogen fuel storage to the nozzle. The pre-cooling circuit is provided to cool hydrogen fuel in the fueling line, and includes a pre-cooling line connected to the fueling line downstream from the hydrogen fuel storage, and a flow-path selector provided at a connection between the fueling line and the pre-cooling line. The flow-path selector selectively: blocks hydrogen fuel flow between the fueling line and the pre-cooling line while opening hydrogen fuel flow between the fueling line and a nozzle line of the nozzle; and opens hydrogen fuel flow between the fueling line and the pre-cooling line.

The present invention relates to a vapor recovery system for gas station that is capable of controlling vapor emission to less than 0.38 lbs/1000 gallons fuel dispensed. The system may include at least one canister containing adsorbents such as activated carbon, zeolite, activated alumina, silica, and other adsorbents for passive removal of hydrocarbon vapors in venting air. Additionally, the system may include a means to enhance vapor-liquid equilibrium in the ullage of the fuel tank and accordingly minimize vapor emission level.

A high speed particle packaging machine comprises a weighing station, operable to weigh a cluster of particles. A densification station is positioned downstream of the weighing station and is operable to collect a cluster of particles recently released from the weighing station to densify the cluster of particles. The densification station includes an openable gate operable to instantaneously release the cluster of particles collected at the densification station. A bagging station is positioned downstream of the densification station and is operable to receive the densified cluster of particles after being released by the gate.

A high speed particle packaging machine comprises a weighing station, operable to weigh a cluster of particles. A densification station is positioned downstream of the weighing station and is operable to collect a cluster of particles recently released from the weighing station to densify the cluster of particles. The densification station includes an openable gate operable to instantaneously release the cluster of particles collected at the densification station. A bagging station is positioned downstream of the densification station and is operable to receive the densified cluster of particles after being released by the gate.