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A calibrated oxygen metering orifice for a portable oxygen supply kit is made by first forming a cylindrical hole in a valve body, then progressively pressing into the hole a plug of conforming cross section having in its surface a scored slot of progressively decreasing cross-sectional area which d

A calibrated oxygen metering orifice for a portable oxygen supply kit is made by first forming a cylindrical hole in a valve body, then progressively pressing into the hole a plug of conforming cross section having in its surface a scored slot of progressively decreasing cross-sectional area which defines with the wall of the hole an orifice of a size depending on the depth to which the plug is inserted in the hole, monitoring the gas flow rate through such orifice as the plug is pressed into the hole, and stopping the plug at a position which gives the desired calibrated gas flow rate.

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A calibrated gas metering valve, comprising a valve body having a gas inlet and a gas outlet and a dividing wall formed with a hole therein defining a passage for gas flow from the inlet to the outlet, a plug press-fitted in the hole so as to be solely positioned therein by the fitting engagement of

A calibrated gas metering valve, comprising a valve body having a gas inlet and a gas outlet and a dividing wall formed with a hole therein defining a passage for gas flow from the inlet to the outlet, a plug press-fitted in the hole so as to be solely positioned therein by the fitting engagement of its peripheral surface with the wall of the hole, one of the interface surfaces between the plug and the wall of the hole having therein a groove or the like of progressively decreasing cross section so as to define therebetween an opening of a size that depends on the depth to which the plug is inserted in the hole, the plug being positioned in the hole at a determined depth which produces an opening size giving a desired flow rate.