MIL-DTL-24630A(SH)
3.5.2 Rated flow capacity. Rated flow capacity shall be in accordance with the values shown on the applicable
specification sheet (see 4.6.1).
3.5.3 Pressure drop. The differential pressure at rated flow shall be not greater than the values shown on the
applicable specification sheet (see 4.6.1).
3.5.4 Proof pressure. The valve shall withstand a proof pressure of 4,500 lb/in² without external leakage,
failure, or permanent set (see 4.6.2).
3.5.5 Leakage. Leakage through the valve shall not exceed the values shown in table I when tested at the
TABLE I. Leakage.
Maximum internal leakage
Pressure
After endurance test
(lb/in²)
New (conformance)
(qualification only)
5
As indicated on specification sheet
150 percent of leakage on specification sheet
500
As indicated on specification sheet
150 percent of leakage on specification sheet
3,000
As indicated on specification sheet
150 percent of leakage on specification sheet
3.5.6 Operation.
3.5.6.1 Checking time. The valve shall be completely closed within 1½ seconds after the closing mechanism is
released (see 4.6.4.1).
3.5.6.2 Cracking pressure. The cracking pressure (see 6.5.1) shall be not less than 2 lb/in² nor greater than
8 lb/in² (see 4.6.4.2).
3.5.6.3 Valve chatter. The valve shall operate without surging or chattering on the seat at flow velocities up to
40 feet per second and with the valve axis in any position.
3.5.7 Temperature extremes. The valve shall operate throughout the temperature range of -22 to +194 °F
3.5.8 Endurance. The valve shall operate during and at the conclusion of 50,000 cycles of operation at not less
than one half of the rated flow capacity in test fluid contaminated to Class 10 of SAE-AS4059 (see 4.6.6).
3.5.9 Fatigue rating. The valve assembly shall have a fatigue rated pressure of 3,000 lb/in² in accordance with
NFPA-T2.6.1 based upon a 90 percent assurance level and a 90 percent confidence level. The cyclic test pressure to
be used shall be determined by applicable test duration and variability factors identified in NFPA-T2.6.1 (see 4.6.7).
3.5.10 Salt spray. There shall be no evidence of surface corrosion of metal parts following the salt spray test
(see 4.6.8). The valve shall be subjected to a salt spray test if materials other than specified herein are used for the
valve external body.
3.5.11 Vibration. The valve shall meet the vibration requirements as specified in MIL-STD-167-1 for Type I
equipment. If the valve is symmetrical about a principal axis, vibration testing shall only be accomplished along
two orthogonal axes, one of which must be the principal axis of symmetry (see 4.6.9).
3.5.12 Shock. The valve shall meet the shock requirements as specified in MIL-S-901 for Grade A, Class I
equipment (see 4.6.10).
3.5.13 Structureborne noise. The valves shall meet the structureborne noise requirements of figure 1 when
tested in accordance with MIL-STD-740-2 (see 4.6.11).
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