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MIL-V-29592(AS)
3.3 Materials.  Materials shall be as specified herein and in referenced
specifications and standards. Materials shall be free of defects which
adversely affect performance of the finished product.
The automatic air vent valve shall be constructed of
3.3.1 Compatibility.
materials that will not adversely affect or be affected by hydraulic fluid
conforming to MIL-H-83282 and MIL-H-46170.
3.3.2 Metals.  Metals shall be of a corrosion resistant type or shall be
treated to resist corrosion when exposed to climatic and environmental con-
ditions encountered during the service life of the equipment. The use of any
protective coating that will crack, chip, Or scale with age or extremes of
climate and environmental conditions shall be avoided.
3.3.3 Aluminum alloy parts.  Aluminum alloy parts exposed to the environ-
ment shall be anodized in accordance with MIL-A-8892.
3.3.4 Steel parts.  Steel parts shall have a minimum chrome content of 12
percent to prevent corrosion. Corrosion resistant steel parts shall be passi-
vated in accordance with QQ-P-35.
3.3.5 Fungus-proof materials.  Materials which are not nutrients for
fungus shall be used to the greatest extent. In cases where materials that
are nutrients for fungus must be used, such materials shall be treated with a
fungicidal agent as approved by the procuring activity.
3.3.6 Dissimilar metals.  Combinations of all automatic air vent valve
parts and hydraulic tubing as specified in MIL-H-5440 shall be compatible as
specified in MIL-STD-889.
3.4 Design.  Automatic air vent valves specified under this specification
shall be capable of releasing undissolved air from hydraulic system while at
the same time preventing oil from leaking out of the system. The valve shall
be capable of operating with the air vent valve outlet in the range of
positions from vertical to 80 degrees from the vertical position in any
direction. Venting of air may be continuous upon system pressurization or
intermittent based upon system pressurization and depressurization. Detailed
operating requirements and pressure levels shall be is listed in the
applicable military specification sheet.
3.4.1 Joints.  The automatic air vent valve design shall incorporate the
minimum number of external joints. Consideration shall be given to bonding
any valve housing joints by permanent methods. Screw threads shall conform to
MIL-S-8879.
3.4.2 Lockwire.  Lockwire holes shall be provided as specified in the
military specification sheet. All threaded screws and joints shall be locked
as specified in MIL-H-8775.
3.4.3 Temperature.  The automatic air vent valve shall be capable of
0
operating at temperatures from -40 to 275 F as specified in the applicable
military specification sheet.
4

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