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|  MIL-V-81995(AS)
High temperature. The valve shall be soaked at
4.5.15
maximum nonoperating temperature for 8 hours. Upon completion of the
soak, the valve inlet shall be conditioned to maximum conditions where
leakage shall be measured and the valve shall be subjected to 10 continuous
cycles of 60 seconds open followed by 60 seconds closed. The valve
shall then be subjected to 10 continuous cycles at 2 minutes open followed
by 5 minutes closed. All cycles shall be conducted using maximum inlet
conditions.
4.5.16
Dielectric strength. The electrical circuit of the
valve shall be subjected to a dielectric strength test in accordance
with MIL-E-25499.
Pressure drop. Loss in static pressure from inlet
4.5.17
to outlet port of the valve shall be determined for a range of conditions
so that a plot of W T/P versus WP/P on logarithmic (log-log) graph
paper can be made where:
w = Actual weight flow, PPUI
T = Valve inlet air temperature, degrees Rankine
P = Valve upstream air pressure, psia
Pressure drop (WP) in excess of that specified in the specification
sheet shall be cause for rejection.
4.5.18
External load. The valve shall be mounted by one of
its connecting flanges and the external loads specified in the specification
sheet applied at the opposite flange. Bending moment loads shall be
applied in both directions in each of two mutually perpendicular planes
whose intersection falls on the centerline of the connecting flanges.
The test shall be repeated with the valve mounted on the opposite flange.
There shall be no evidence of damage or permanent deformation to the
valve as a result of the applied loads.
4.5.19
Burst pressure. With the valve in the closed position
and the outlet port open to atmospheric pressure, an air pressure equal
to the minimum burst pressure specified in 3.7.5 (three times the maximum
inlet air pressure specified in the specification sheet), shall be
applied to the inlet port of the valve for a period of 10 minutes. The
test shall be repeated with the valve in the open position and the
outlet port capped. The unit shall show no evidence of structural
failure upon completion of this test.
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