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|  MIL-V-24694(SH)
4.3.1 Qualification sampling Qualification inspection shall be conducted
on one sample valve representative of pressure classes as specified on the appli-
cable specification sheets.
4.3.2 Extension of qualification. Qualification may be extended on the
basis of similarity if the following criteria are met:
(a) Qualification of a valve corresponding to a specific pressure
range may be extended to all ranges by similarity if only the
springs are changed to alter the pressure range,
(b) For the pressure range selected for qualification testing, the
inspections shown in table I for qualification shall be
accomplished.
(c) For additional pressure ranges of the same configuration valve,
only the rated flow differential pressure, reseat pressure,
and leakage qualification tests shall be required,
4.3.3 Data submittal. Prior to test authorization (preferably together
with application for qualification) the manufacturer shall submit two sets of
assembly drawings for each relief valve assembly for which approval to conduct
qualification tests is requested. Assembly drawings shall show a cutaway section
of details in their normal assembly positions and shall carry part numbers of
details and subassemblies. The following data shall be furnished on, or together
with, the assembly drawings:
(a) Outline dimensions of the complete assembly.
(b) Cross-sectional views showing internal flow paths.
(c) Bill of material, listing specifications, grade, and condition,
or other data needed to identify the material proposed.
(d) Complete disassembly procedure and description of tools needed
including handling of internal parts that are subject to
reverse installation.
(e) Data on spring and spring rate.
(f) pressure setting adjustment instructions.
4.4 Quality conformance inspection. Quality conformance inspection shall
consist of the examination of 4.7.1 and the tests of 4.7.2 and 4.7.3.3. Each
valve shall be subjected to quality conformance inspection.
4.4.1 Certificate of compliance. When specified in the contract or pur-
chase order, a certificate of compliance shall be prepared (see 6.2.2).
4.5 Teat conditions.
4.5.1 Test fluid. Unless otherwise specified herein, the hydraulic fluid
used for all qualification tests shall conform to MIL-H-17672, 2135TH at a mini-
mum temperature of 40C. For quality conformance, any of the fluids specified
in 3.3.4 may be used as the test fluid, provided that the fluid temperature is
adjusted to maintain a fluid viscosity of less than 75 centistokes. Increased
leakage for quality conformance testing with lower viscosity fluids shall be
justified in the qualification test report and approved by the qualifying
activity.
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