IAS NGV 4.4/CSA 12.54:1999 (R2014)

This standard applies to newly produced compressed Natural Gas Vehicle (NGV) dispenser shear valves and fueling hose emergency breakaway shutoff devices, which are intended to minimize the escape of natural gas by automatically shutting off the flow of gas from the dispenser and control the depressurization of the hose, minimize damage to the vehicle and dispenser when a vehicle is driven off with the nozzle attached to the vehicle's fueling receptacle and automatically shut off the flow of gas in the event of a vehicular collision with a fuel dispenser that results in the displacement of the dispenser from its gas supply connection.