MIL-STD-2193C(SH)
5.2.2 Reverse installation. When internal parts can be reversed or rotated and, as a consequence, the component is subject to malfunction, a method of verifying proper assembly shall be provided. This shall consist of a functional test which shall be identified on the component assembly drawing specified in the component specification, or by keying, directional arrow, indexing, or other method of identifying direction of installation.
5.2.3 Structural strength. Components shall withstand, without damage, the following types of loads or combinations of loads resulting from:
a. hydraulic pressure, b. vibration,
c. shock,
d. temperature variations, e. actuation,
f. operation,
g. fastener installation, or
h. torque loads for connection of tube fittings in accordance with MS21344
5.2.4 Weight. System components shall be designed for minimum weight consistent with the requirements of this standard.
5.2.5 Surface roughness. Surface roughness finishes for all moving and mating parts shall be identified in accordance with ASME B46.1. The determination of surface finishes shall be made with a profilometer, comparator brush analyzer, or other comparison equipment with an accuracy of ±15 percent at the level being measured. If surface defects are unacceptable, either all imperfections shall be within stated limits or special inspection
procedures shall be identified. Where a surface of 16-microinch Ra or finer is specified, the process description shall be in addition to required surface measurement. When necessary for assembly or proper operation, waviness and lay shall be specified.
5.2.6 Alignment. Plungers, poppets, balls, pistons and so forth, shall be accurately guided to prevent misalignment or chattering.
5.2.7 0rifices. Where orifices less than 500 micrometers in diameter are used internally in the component, the orifice shall be removable for system flushing and shall be protected by a strainer-type element. 0rifices and strainers shall withstand 110 percent of operating pressure, including no-flow conditions, without rupture. Strainers protecting the orifices shall have openings no larger than 40 percent of the orifice diameter.
5.2.8 Seals.
5.2.8.1 Gland design and related requirements. Components shall be designed so that no damage to the seals would be incurred from assembly of the component or from installation of the seals passing over threads or other sharp corners (see 6.1.3). The glands for 0-rings or other elastomeric seals for radial, face, or boss applications shall be in accordance with an established technical standard or specification that conforms to the standard sized seals. See table II for guidance on 0-ring gland design options based on established technical standards or specifications. Radial seal gland designs other than those specified in table II may be used for 0-rings and other elastomeric seals when use of alternate gland designs (a) supports performance, installation, or other requirements, (b) permits the use of standard sized seals and (c) is also allowed by the component acquisition specification. Similarly, for existing Navy designs at the assembly or part level, the existing seal glands and associated backup rings are acceptable if they perform satisfactorily when standard size seals are utilized.
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