A covered port may be incorporated into the valve assembly to allow inhalatory medicines to be injected into the airflow, which may be particularly effective in treating patients in respiratory arrest from severe asthma.
22.
The workers were killed at a plant near Houston on Dec . 22, when pressurized nitrogen escaped its containers and caused an explosion so powerful it threw a 3, 000-pound valve assembly more than 200 yards, leaving a 5-foot deep crater in the earth.
23.
A National Fire Protection Association report attributed the ignition of the fire to human error by a worker who had identified faulty valve assembly on gas cylinder in a ground-floor buffet; while attempting to shut off the valve, the worker inadvertently increased the flow of gas and caused an explosion.
