A Design Study in Steel - Crossbleed Valve for the F-5
Crossbleed Valve
Body -- Description
The
main cylinder has a 2” ID and a length of
3 ¼" and a wall thickness of 1/8".
The
actuator cup has a 1 ¾” ID and a depth of 1 ¾".
The
solid connecting shaft has a 1” diameter and a length of
1".
The
bulk envelope dimensions are 6” x 4” x 3”.
The
as-cast dimensional tolerances are ±.015”; these
tolerances are critical for fit and function.
The
surface finish is specified as 125 RMS and edges are radiused at
0.12”.
The
as-cast valve body weighs 2.2 pounds before machining.
All mating surfaces, screw holes, and
the linkage channel are
machined after heat-treatment. The
valve body must be free of internal porosity and flaws to prevent air
leakage and fatigue failure.
The
quality requirements for the valve body are defined by x-ray and penetrant
inspection against the AMS STD 2175 class 2 grade C specifications.
Copyright 2007 by
the Steel Founders' Society of America.
All rights reserved.
Address comments to: blairr@sfsa.org
Last Modified:December, 2007 by STG
