This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Face Seal Gland Design, Static, O-ring and Other Seals for Aerospace Hydraulic and Pneumatic Applications
- Aerospace Standard
- AS6235A
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Aerospace Standard (AS) specifies standardized gland design criteria and dimensions for static face seals for internal pressure and external pressure applications for aerospace hydraulic and pneumatic applications using the same size range as AS4716 and AS5857 where applicable. Some small diameter sizes are excluded because they are not practical.
The glands have been specifically designed for applications using AS568 size elastomeric O-rings with related Class 2 tolerances at nominal system operating pressures up to 3,000 psi (20,680 kPa) utilizing no anti-extrusion (backup) rings.
While the gland dimensions herein have been designed for pressures up to 3,000 psi (20,680 kPa) these glands may be used for higher pressures, but extra precautions need to be taken and testing should be performed to ensure integrity of performance.
This specification covers the basic design criteria and recommendations for use with standard size elastomeric O-rings, however, these glands are also suitable for use with other elastomeric and polytetrafluoroethylene (PTFE) based seal geometries.
Rationale
At Revision A, the following changes have been made:
-
Minor technical and editorial comments, minor dimensional changes
-
An analytical tool has been provided that details the calculations used to determine gland dimensions
-
Annex E has been added which provides supporting information
Recommended Content
Topic
Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Table 1 | Maximum and minimum squeeze levels at various temperature limits | |
Table 2 | 000 series range of gland occupancies by varying component tolerances | |
Table 3 | Groove cross section details for internal pressure applications | |
Table 4 | Groove cross section details for external pressure applications | |
Table 5 | Groove break edge details | |
Table 6 | Groove standard corner radius dimensions | |
Table 7 | Surface roughness requirements | |
Table 8 | Standard groove diameters for internal and external pressure applications | |
Table B1A | Comparison of groove diameters, AS6235, ARP1234, AS4873 (inches) | |
Table B1B | Comparison of groove diameters, AS6235, ARP1234, AS4873 (millimeters) | |
Table 3 | Gland cross section details for internal pressure applications | |
Table 4 | Gland cross section details for external pressure applications | |
Table C1A | Maximum and minimum groove depths for AS4716 and AS5857 piston seal hardware (inches) | |
Table C1B | Maximum and minimum groove depths for AS4716 and AS5857 piston seal hardware (millimeters) | |
Table D1 | Entries and results for standard O-ring and gland dimensions | |
Table D2 | Entries for standard O-ring dimensions with custom elastomer material properties, and resulting gland dimensions, tolerances, O-ring squeeze and gland occupancies | |
Table D3 | Entries for non-standard O-ring dimensions with custom elastomer material properties, and resulting gland dimensions and tolerances, O-ring squeeze and gland occupancies | |
Table E1 | Elastomer material properties | |
Table E2 | Summary of critical elastomer materials | |
Tables E3A through E3G | Squeeze dependent on groove depth and O-ring cross section | |
Tables E3A through E3G | Squeeze dependent on groove depth and O-ring cross section | |
Tables E3A through E3G | Squeeze dependent on groove depth and O-ring cross section | |
Tables E3A through E3G | Squeeze dependent on groove depth and O-ring cross section | |
Unnamed Dataset 28 | ||
Table E4 | Summary of gland occupancy for -008 size for each selected elastomer material |
Issuing Committee
A6C2 is responsible for the development of standards, processes, and practices related to Seals, Scrapers and Bearings used in actuation systems for Commercial and Military air vehicles. The panel provides a forum for government engineers, prime contractors, OEMs and suppliers to exchange technical information, regulatory updates, recent technology developments, issues related to system development and in service operation and lessons learned.
Reference
* Redlines comparisons are available for those standards
listed in the Revision History that contain a radio button. A
redline comparison of the current version against a revision is
accomplished by selecting the radio button next to the standard and
then selecting 'compare'. At this time, Redline versions only exist
for some AMS standards. SAE will continue to add redline versioning
with ongoing updates to SAE MOBILUS.