MIL-STD-2193C(SH)
3. DEFINITIONS
3.1 Radial static external seal. A radial static seal that is located at the outermost pressure boundary of the component (i.e., prevents leakage outside of the component).
3.2 Radial static internal seal. A radial static seal that is not located at the outermost pressure boundary of the component (i.e., only prevents leakage inside of the component).
4. GENERAL REQUIREMENTS
4.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.
4.2 Compatibility. Components shall be compatible with system hydraulic fluids, to include:
MIL-PRF-17672, MIL-H-22072, MIL-PRF-17331, MIL-H-19457, and synthetic hydraulic fluids. Components shall also be compatible with preservation fluid in accordance with MIL-PRF-6083.
4.3 Materials. Materials used in the manufacture of hydraulic components shall be compatible with the specified fluids and temperatures. Unless otherwise specified in the component specification, materials shall conform to the applicable reference documents cited herein. Material conforming to contractor's specifications may be used provided it can be demonstrated that they are at least equivalent to the applicable military specifications and standards with respect to performance characteristics.
4.4 Environmental conditions. This standard does not anticipate all potential component operational environments; therefore, component acquisition specifications must specify those applicable operational environments that differ from those provided herein. Unless otherwise specified by the component specification, components shall operate continuously in the environments specified herein.
4.4.1 Ambient pressure. The components shall operate throughout an ambient pressure range of 0.825 to
1.25 bars [12 to 18 pounds per square inch (lb/in2)] absolute and shall operate to the requirements of this standard and the applicable component specification.
4.4.2 Ambient temperature. Unless otherwise specified in the applicable component specification, components shall operate throughout an ambient temperature range of -29 to 80 °C (-20.2 to 176 °F), except components
installed within heated spaces shall operate throughout a temperature range of 5 to 80 °C (41 to 176 °F).
5. DETAILED REQUIREMENTS
5.1 Materials.
5.1.1 Metals. Metals shall be compatible with the intended temperature, function, service, and storage conditions to which the components will be exposed. The metals shall possess corrosion-resistant characteristics or shall be protected by anodizing or the use of coatings to resist corrosion which may result from such conditions as dissimilar metal combinations, moisture, salt spray, and high temperature deterioration, as applicable. Dissimilar metals are defined in MIL-STD-889. Low ductility material or high transition temperature material shall not be used in pressure-containing boundaries of components. (Control valve slides and sleeves are exempt where suitability is proven by high-impact shock tests.) Low ductility material and high transition temperature material may be used in non-pressure boundary and non-load carrying applications where suitability is proven by
high-impact shock tests. Low ductility material is metallic material showing less than 10 percent elongation in a standard tension test. High transition temperature material is material having a Nil-Ductility Transition Temperature (NDTT) above the minimum operational temperature. The NDTT shall be measured by the drop-weight test in accordance with ASTM E208. Charpy V-notch impact values may be used as criteria when these have been correlated with drop-weight test results.
5.1.2 Plated coatings. Plated coatings and materials used in the component shall be only those suitable for the intended service and shall be in accordance with table I or provide equivalent protection as determined by the contracting activity. Where not indicated, class or type is at the option of the manufacturer.
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