This standard covers all types of manually operated high pressure oxygen, cylinder shut off valves for use in commercial type aircraft. It is intended that the valve shall be attached to a pressure cylinder storing oxygen under pressure of 1800 to 2100 psi at 70 F. Upon opening the valve, oxygen will be permitted to discharge from the storage cylinder to the valve outlet and thence to other components of the oxygen system. It shall also be possible to recharge the cylinder through the valve.The purpose of this standard is to define general minimum standards for the design, fabrication, test and packaging of manually operated, high pressure breathing oxygen cylinder shut off valves. Applicable is AS 861, MINIMUM GENERAL STANDARDS FOR OXYGEN SYSTEMS.