Abstract: A gas dispensing assembly suitable for dispensing oxygen from a vessel pressurized to 1800 pounds per square inch, the assembly including a manually operable member to turn supply of oxygen from said vessel on and off, a regulator valve supplied with gas at the pressure inside of the vessel when the supply is turned on, a spring biased regulator operable to control the opening and closing of the regulator valve to regulate the pressure in an outlet to a desired pressure for supply of the gas to the interior of a face mask; the assembly being capable of supplying oxygen to the face mask for a period exceeding 15 minutes at a flow rate exceeding 6 liters per minute with little variation of that flow rate with variation of pressure of the supply of oxygen.

Abstract: A gas dispensing assembly suitable for dispensing oxygen from a vessel pressurized to 1800 pounds per square inch, the assembly including a manually operable eccentric member to turn supply of oxygen from said vessel on and off, a demand valve supplied with gas at the pressure inside of the vessel when the supply is turned on, a spring biased resilient diaphragm regulator operable to control the opening and closing of the demand valve to regulate the pressure in a regulator chamber to a desired pressure, an orifice through which the gas passes from the regulator chamber to an outlet valve which is opened by a demand for gas to supply the gas from the orifice to the interior of a face mask; the assembly being capable of supplying oxygen to the face mask for a period exceeding 15 minutes at a flow rate exceeding 6 liters per minute with very little variation of that flow rate with variations of pressure of the supply of oxygen.