EVALUATION OF IMPROVED EXHALATION VALVE FOR HGU-8/P FLYING HELMET.

Abstract

The report records the results of a component improvement program on an exhalation valve for the HGU-8/P 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)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1966
Accession Number
AD0633952

Entities

People

  • Donald R. Good

Tags

DTIC Thesaurus Topics

  • Altitude
  • Friction
  • High Altitude
  • Internal Friction
  • Low Temperature
  • Partial Pressure
  • Pressure Suits
  • Reliability
  • Sensitivity
  • Test And Evaluation

Readers

  • Combustion and Flow Dynamics.
  • Systems Analysis and Design
  • Underwater engineering and Marine Technology.