The Design of an Adjustable Breathing Bag Exhaust Valve for Closed and Semi-Closed Circuit Scuba.
Abstract
Existing closed and semi-closed circuit scuba breathing bag exhaust or relief valves were studied with the object of developing a standard U.S. Navy valve. A Canadian relief valve proposed as a substitute for the British CDBA relief valve was also studied. The latter valve (CDBA) was used as a starting point, and redesigned to provide a range of relief adjustment from approximately 0.4 to 2.85 psi. A relatively secure, manually operated dump knob which permits rapid purging of the breathing bag is provided. A hand-made, modified valve was tested and found to be superior to the available models. Detailed manufacturing drawings of the modified valve, including several design refinements such as non-magnetic materials and improved fittings, are submitted with the recommendation that prototypes be procured and field tested. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 05, 1958
- Accession Number
- AD0780664
Entities
People
- C. J. Leyden
- W. F. Fischer
- W. F. Searle Jr.
Organizations
- United States Navy Experimental Diving Unit