GAS FLOW CONTROL DEVICE FOR USE IN AEROSPACE THERMAL AND ATMOSPHERE CONTROL SYSTEMS

reportActive / Technical Report | Accession Number: AD0708160 | Open PDF

Abstract:

The purpose of the work was to develop a small, lightweight oxygen flow control device able to deliver 2.65 0.05, -0.00 lbhr oxygen at a nominal outlet pressure of 200 psig when supplied by an upstream pressure regulator and operated in ambient temperatures from -40F to 200F. The flow controller meters the oxygen through a variable area choked flow orifice. The orifice assembly consists of a rod, spring-loaded against a diaphragm and allowed to move axially inside a sharp edged hole. The variable orifice is formed by the gap between the edge of the hole and a flat machined on the periphery of the rod and inclined to the rod axis. Axial motion of the rod varies the gap, and therefore the orifice area. One side of the diaphragm is exposed to the upstream pressure of the orifice, and the opposite side is exposed to a trapped constant volume of gas having a pressure proportional to the gas temperature. The diaphragm deflection and the orifice area are linearly related to the pressure and temperature of the gas at the device inlet. Proper selection of the critical design values enables the variation of orifice area to compensate for changing inlet conditions.

Author(s):
Goldstein, Seth R. ; Harvey, Andrew C. ; Meyer, Clemens M.
Author Organization(s):
FOSTER-MILLER INC WALTHAM MA
Descriptive Note:
Final rept. 15 Jun-30 Nov 1969
Supplementary Note:
DOI: 10.21236/AD0708160
Pagination:
0044

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AMRL-TR-70-22
Contract/Grant Number(s):
F33615-69-C-1686
Task Number(s):
716411
Project Number(s):
AF-7164
Monitor Series:
TR-70-22, AMRL
 Subject Terms
Joint Capability Areas:
JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_1.2_Force Preparation; JCA_1.2.6_Concepts; JCA_4.3_Maintain; JCA_5_Command and Control
Communities of Interest:
Space
Descriptor(s):
*PNEUMATIC SERVOMECHANISMS, CONTROL SYSTEMS, OXYGEN, TEMPERATURE CONTROL, EXTRAVEHICULAR ACTIVITY, GAS FLOW, ORIFICES
Field(s)/Group(s):
Hydraulic and Pneumatic Equipment, Life Support Systems
Keyword(s):
*CONTROL, *FLUID FLOW
Report Date:
1970 Mar 01