MIL-PRF-25675C
3.4.3 Item identification. The valve shall be permanently and legibly marked with the following information:
a.
Manufacturer's name
b.
Manufacturer's CAGE code
c.
Manufacturer's part number (PN)
d.
National Stock Number (NSN)
e.
Date of manufacture
3.5
Environmental conditions. The valve shall operate under the following conditions:
-65° to 450°F.
a.
Temperature:
b.
Vibration:
(1) a frequency between 20 and 90 Hz with a 0.05 double amplitude.
(2) a frequency between 90 and 2,000 Hz with an acceleration of ±20g.
3.6
Performance.
Proof pressure. The valve shall withstand a proof pressure of 4,500 (+150, -0) psi at 450° ± 5°F in both the
3.6.1
free-flow and reverse-flow directions.
3.6.2
Surge flow. The valve components shall withstand 25 flow cycles (see 6.5.4).
3.6.3
Leakage. When the valve is held in the horizontal or vertical position, the internal leakage rate of the valve
shall not exceed the values specified in Table I with the pressure applied in the reverse flow direction.
TABLE I. Leakage
Pressure (psi)
Maximum leakage rate
(drops per minute)
5
1
1,000 to 3,000
None
3.6.4
Checking time and cracking pressure. The checking time (see 6.5.1) of the valve shall not exceed 1.5
seconds. The cracking pressure (see 6.5.2) shall be between 2 and 8 psi.
3.6.5
Pressure drop. The pressure drop through the valve at rated flow shall not exceed 15 psi.
3.6.6
Endurance. The valve shall withstand 50,000 impulse cycles (see 6.5.5) at the rate of 30 to 100 cycles per
minute (cpm) at a temperature of 450° ± 10°F.
3.6.7
Burst pressure. The valve shall withstand a maximum pressure of 7,500 psi.
Flexural strength. The valve shall withstand flexing (see 6.5.3) at 450° ± 10°F.
3.6.8
3.6.9
Repeated assembly. The valve shall be capable of repeated assembly and disassembly without affecting the
performance or life of the valve.
3.6.10 Workmanship. The valve shall be constructed in accordance with commonly accepted industrial
workmanship standards.
3
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