MIL-DTL-24694A(SH)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between
the text of this document and the references cited herein (except for related specification sheets), the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless
a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with
the applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 Qualification. Valves furnished under this specification shall be products that are authorized by the
qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3).
3.3 Materials. Materials shall be limited to those specified herein and on applicable specification sheets.
Metals shall be compatible with the fluid, temperature, service, and performance requirements specified herein.
3.3.1 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.
3.3.2 Prohibited and restricted use materials.
3.3.2.1 Prohibited materials. The following materials shall not be used:
a.
Toxic materials
b.
Zinc or zinc plated materials (see 3.3.4.1)
c.
Mercury
d.
Magnesium or magnesium base alloys
e.
Radioactive materials
f.
Asbestos
g.
Cadmium (see 3.3.4.1)
3.3.2.2 Restricted use material. Beryllium is acceptable as a small percentage alloying material in parts that are
not subjected to welding.
3.3.3 Metal alloys. Unless otherwise approved by the qualifying activity, alloys for use in pressure-containing
parts of valves shall be limited to the following:
a. Aluminum alloy: Alloy 6061- Tempers T6, T651, or T6511 in accordance with ASTM B211 or
ASTM B221, as applicable.
b.
Nickel-copper alloy: QQ-N-281, Class A.
c. Corrosion Resistant (CRES): Class 302, 304, 304L, 316L, or 440C in accordance with SAE-AMS-QQ-A-
763, or Type 303 in accordance with ASTM A582, or Type 1 or 2 in accordance with SAE-AMS5610.
3.3.4 Compatibility. The valve shall be constructed of materials which are compatible with fluids as specified
in MIL-PRF-83282, MIL-H-19457, MIL-PRF-6083, MIL-H-22072, MIL-PRF-17331, and MIL-PRF-17672.
3.3.4.1 Cadmium and zinc plating. Cadmium and zinc plating shall not be used for internal parts or on internal
surfaces in contact with hydraulic fluid. This restriction does not prohibit the use of zinc or cadmium-plated parts
such as nuts, bolts, and screws in locations that are external to the system where there is no danger of fluid
contamination.
3.4 Construction. Cartridge-type relief valve construction shall be as specified herein and on the applicable
specification sheet. Overall dimensions shall be as specified on the applicable specification sheet.
3.4.1 Preformed packing (o-rings). O-rings shall be fluorocarbon rubber in accordance with SAE-AS3209.
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