MIL-DTL-27166F
4.6.1.2.3
Type III cracking and reseal.
The valve shall be subjected to the test detailed in 4.6.1.2.1 for both pressure and vacuum relief
directions.
4.6.1.2.4
Flow rate.
For each flow direction, the valve shall be subjected to a pressure differential of 1.5 psi (10.3
kPa) greater than the specified reseal pressure which tends to produce flow in that respective
flow direction. The flow rate through the valve shall be measured in each respective flow
direction. For valves using filters, the filters shall be installed during the flow rate test.
4.6.1.2.4.1
Types I and II flow rate.
The valve shall be subjected to the test described in 4.6.1.2.4 in the specified relief direction.
4.6.1.2.4.2
Type III flow rate.
The valve shall be subjected to the test described in 4.6.1.2.4 for both pressure and vacuum
relief directions.
4.6.2 Operating life.
The valve shall be subjected to 2500 cycles, at room temperature, as specified in 4.6.1.1.1 or
4.6.1.1.2. After completion of the test, the valve shall be tested as specified in 4.6.1.2 and
applicable sub-paragraphs.
4.6.3 Environmental tests.
The valve shall be subjected to the following tests in accordance with applicable procedures of
MIL-STD-810 and ASTM D999. The valve shall be mounted in a test cell that permits operation
of the valve during those tests that require valve operation. The valve shall be mounted in a
manner that exposes those surfaces to the test environment that would normally be exposed
when the valve is installed in a shipping container. For type II and type III valves a vacuum shall
be applied to the test cell to produce vacuum relief operation. Surfaces of the valve normally
protected by the shipping container internal environment may be protected by the test cell
internal environment.
4.6.3.1 High temperature.
MIL-STD-810, Method 501.4, Procedure II Operation, shall be used, except that during the
+160 °F (+71 °C) exposure period, the valve shall be operated through 1000 cycles as specified
in 4.6.1.1.1 or 4.6.1.1.2. The duration of the test shall be 72 hours. After completion of the test,
the valve shall be tested as specified in 4.6.1.2 and applicable sub-paragraphs.
4.6.3.2 Low temperature.
MIL-STD-810, Method 502.4, Procedure II (Operation), shall be used, except that during the -80
°F (-62 °C) exposure period the valve shall be operated through 1000 cycles as specified in
4.6.1.1.1 or 4.6.1.1.2. The duration of the test shall be 72 hours. After completion of the test,
the valve shall be tested as specified in 4.6.1.2 and applicable sub-paragraphs.
4.6.3.3 Humidity.
MIL-STD-810, Method 507.4, Procedure II, Induced Hot Humid Condition for 10 diurnal periods
shall be used. Cycling shall be performed periodically during the test. At least two (2) complete
cycles as specified i n 4.6.1.1.1 or 4.6.1.1.2 shall be accomplished each hour. After completion
of the test, the valve shall be tested as specified in 4.6.1.2 and applicable sub-paragraphs.
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