The Design of an Adjustable Breathing Bag Exhaust Valve for Closed and Semi-Closed Circuit Scuba.

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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

Author(s):
Fischer, W. F. ; Leyden, C. J. ; Searle, W. F., Jr
Author Organization(s):
NAVY EXPERIMENTAL DIVING UNIT WASHINGTON D C
Descriptive Note:
Research rept.,
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NEDU-RR-4-58
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*DIVER EQUIPMENT, *BREATHING APPARATUS, *EXHAUST VALVES, RELIABILITY, SAFETY VALVES, PRESSURE BREATHING, ENGINEERING DRAWINGS, HOSE FITTINGS, SCUBA DIVING
Field(s)/Group(s):
Life Support Systems
Report Date:
1958 Mar 05