Evaluation of the Preproduction Sample of U. S. Divers Co. Revised Two Stage Aqua-Lung Regulator ('Aqua-Master') and Improved Scuba Cylinders,

摘要

The equipment evaluated consists of U. S. Divers Co's new two stage regulator,the 'Aqua-Master',and a pair of revised type 3000psi aluminum cylinders,as specified by BUSHIPS,with straight thread O-ring sealing arrangement. The overall apparatus did not meet acceptance criteria;having an unacceptably high exhalation resistance as a consequence of a new design exhaust flapper valve. Substitution of the old style upper cover-exhaust valve assembly brought the resistance characteristics within specifications. The O-ring cylinder seal is basically satisfactory but not in accordance with military standards. Numerous minor mechanical deficiencies are noted for change. (Modified author abstract)