MIL-DTL-24694A(SH)
3.5.4.1 Reseat. For any pressure settling throughout the applicable operating range, the valve shall reseat at not
less than the minimum reseat pressure shown on figure 1. The valve is considered to be reseated when leakage does
not exceed that specified in the applicable specification sheet (see 3.1).
3.5.4.2 Leakage. As pressure is decreased after reseating, the leakage shall not exceed 1 milliliter
(0.061 cubic inch) per minute at a pressure equivalent to 75 percent of the set pressure. With pressure increased
from zero to the minimum reseat pressure, the leakage shall not exceed 1 milliliter (0.061 cubic inch) per minute.
3.5.5 Endurance. The valve shall show no sign of damage to the seating surface, instability, or leakage in
excess of twice the amount specified in the applicable specification sheet (see 4.6.7).
3.5.6 Vibration. The relief valves shall operate as specified herein after being subjected to exploratory,
variable frequency, and resonance dwell sinusoidal vibration tests in each of three mutually perpendicular axes
(see 4.6.5). Any of the following conditions resulting from vibration are considered unacceptable:
a.
Damage to parts.
b.
Loosening of parts.
c.
Degradation of operational performance (including leakage) below specification requirements.
3.5.7 Shock. The valve shall meet the shock requirements as specified in MIL-S-901 for Grade A, Class I
equipment (see 4.6.6).
3.5.8 Reseat pressure. The reseat pressure for any nominal set pressure shall be as shown on figure 1
(see 4.6.3.2).
3.5.9 Burst pressure. Unless otherwise specified (see 3.1), the valve shall withstand a burst pressure of
140 bars (2030 lb/in).
3.5.10 Operating temperature. Unless otherwise specified (see 3.1), the valves shall operate throughout a
temperature range of -29 to 135 °C (-20 to 275 °F) when used with fluids suitable for the operating temperature.
3.6 Identification marking. Each valve shall be clearly and permanently identified by steel stamping,
electrochemical etch, or equivalent means with the following information and symbol:
a.
Manufacturer's name, trademark, or logo.
b.
Specification sheet part number.
c.
Manufacturer's part number.
d.
Assembly date (by quarter and year).
3.7 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts are
also interchangeable or reversible with regard to function, performance, and strength.
3.8 Drawings. When specified (see 6.2), drawings shall display component assembly with parts
identification/specification and provide pressure setting adjustment instructions.
3.9 Workmanship. The valve body and internal parts shall be free of burrs, sharp edges, or any other damage
or defects that could prevent the part from performing its intended purpose. Valve shall be free of all metal chips,
grit, dirt, and other foreign matter.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
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