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|  MIL-V-24694(SH)
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 Recovered materials. Unless otherwise specified herein, all
equipment, material, and articles incorporated in the products covered by this
specification shall be new and may be fabricated using materials produced from
recovered materials to the maximum extent practicable without jeopardizing the
intended use. The term "recovered materials" means materials which have been
collected or recovered from solid waste and reprocessed to become a source of
raw materials, as opposed to virgin raw materials, None of the above shall be
interpreted to mean that the use of used or rebuilt products is allowed under
this specification unless otherwise specifically specified.
The following materials shall not be used:
3.3.2 Prohibited materials.
(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)
3.3.2.1 Beryllium. 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 quailifying activity,
alloys for use in pressure-containing parts of valves shall be limited to the
following:
(a) Aluminum alloy: QQ-A-225 and QQ-A-225/8, 6061-T6.
(b) Nickel-copper alloy: QQ-N-281, class A.
(c) CRES: AISI type 302, 304, 304L, 316L in accordance with
QQ-S-763, or type 303 in accordance with ASTM A 582.
3.3.4 Compatibility. The valve shall be constructed of materials which are
compatible with fluids as specified in MIL-H-83282, MIL-H-19457, MIL-H-6083,
MIL-H-22072, and MIL-H-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.
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