MIL-DTL-24694A(SH)
4.2 Qualification inspection. Qualification inspection shall be performed on valves when qualification is
required (see 3.2). Qualification inspection shall be conducted at a laboratory satisfactory to NAVSEA. This
inspection shall consist of the examinations and tests shown in table I. Tests shall be conducted in the sequence
listed in table I unless otherwise approved by the qualifying activity.
TABLE I. Qualification inspection.
Examination or test
Requirement
Examination or text
paragraph
paragraph
Visual examination
Proof pressure
Shock
Vibration
Performance testing
Rated flow differential pressure
Reseat pressure
Internal leakage
Operating temperature performance
Endurance
Burst pressure
4.2.1 Qualification sampling. Qualification inspection shall be conducted on one sample valve representative
of pressure classes as specified on the applicable specification sheets.
4.2.2 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 Conformance inspection. Conformance inspection shall include the examination of 4.6.1 and the tests of
4.4 Test conditions.
4.4.1 Test fluid. Unless otherwise specified herein, the hydraulic fluid used for all qualification tests shall
conform to MIL-H-17672, 2135TH at a minimum temperature of 40 °C (104 °F). For 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 conformance testing with lower viscosity fluids
shall be justified in the qualification test report and approved by the qualifying activity.
4.4.2 Ambient temperature. Unless otherwise specified herein, the tests shall be conducted at a room
temperature of 15 to 35 °C (59 to 95 °F), measured within 0.3 meter (1 foot) of the test sample.
4.5 Test methods. Cartridge-type relief valves shall be tested in a housing designed to accept the valve and
having inlet and outlet ports. The valves shall be free of chatter, surging, or squeal under any condition or
combination of conditions in this specification.
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