Abstract: An apparatus and process for preventive maintenance for nozzle elements of a fuel dispenser or recharging station can include a nozzle preventive maintenance apparatus (e.g. fuel dispenser nozzle preventive maintenance apparatus or vehicle recharging nozzle preventive maintenance apparatus). The nozzle preventive maintenance apparatus can be configured to communicate with a sensor element of a nozzle to evaluate the operational status of that sensor element. In the event the testing determines that the sensor element is malfunctioning or broken, the apparatus can respond by scheduling or ordering maintenance to repair the component so the failure can be identified quickly and resolved to try and avoid the chance that a user may attempt to utilize a nozzle with a non-functioning element and have a negative experience in use of a dispenser (e.g. fuel dispenser or electricity dispenser that can be considered a recharging station).

Abstract: A dispensing system for dispensing compressed gas into a receiving vessel, comprising: a supply of compressed gas; a fill line for connecting the supply of compressed gas to the receiving vessel; a fill valve to vary the flow of compressed gas through the fill line; a controller to control the fill valve; a vent line for venting the fill line downstream of the fill valve; a vent line restriction to restrict flow of the compressed gas through the vent line; and a vent pressure sensor to sense a vent pressure representative of an instantaneous pressure of the compressed gas in the vent line upstream of the vent line restriction and to generate a vent pressure signal based on the sensed vent pressure.