EVALUATION OF IMPROVED EXHALATION VALVE FOR HGU-8/P FLYING HELMET.
Final rept. Aug 63-Dec 65,
SYSTEMS ENGINEERING GROUP RESEARCH AND TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The report records the results of a component improvement program on an exhalation valve for the HGU-8P partial pressure suit helmet. The program was intended primarily to eliminate the tendency for sudden pressure loss within the helmet caused by improper and erratic closing characteristics of the exhalation valve and to meet additional design objectives of greater opening sensitivity, lower pressure drops during flow conditions, and an overall increase in reliability. The valve and its function are described. Internal friction of moving parts was reduced. The opening or cracking pressure was reduced and the differential pressure under flow conditions was improved significantly. Test procedures and results obtained during low temperature tests and room temperature tests at high altitude are presented. It is concluded that the improved design meets the initial objectives of the program. Author
- Protective Equipment