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Fuel resistance and extreme temperature |
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|  MIL-V-25023B
4.5.2 Test fluid.- Unless otherwise specified, fuel in accordance with
MIL-G-5572, grade 100/130 or grade 115/145; MIL-T-5624, grade JP-4; or TT-S-735,
ether fluid acceptable to the procuring activity ) may be used as a substitute
for the test fuel for all tests except wherein a specific fluid is specified.
4.6 Inspection methods.-
4.6.1 Examination of product.- Each valve shall be e xamined to determine
conformance with all requirements of this specification for which there are no
specific tests.
4.6.2 Calibration.- The calibration test shall include the following tests.
4,6.2.1 Functional.- This test shall demonstrate the ability of the valve
to meet the design requirements specified in 3.3.1.1, 3.3.1.2, 3.3.1.5,and 3.3.1.6.
4.6.2.2.1 Flow,- The valve shall be installed in a container conforming to
figures 1, 2, or 3, as applicable. The Container shall be filled with type I,
TT-S-735 fluid to the capacity shown, The valve shall be placed in the open
position and the time started. Recording of the time shall stop when the flow
breaks from continuous stream to drops. The time shall not exceed that shown
on the table of the applicable figure.
4.6.2.1.2 Leakage.-
4.6.2.1.2.1 The fuel leakage test shall be conducted at pressures of 4
inches of fuel, 1 psi, 5 psi, and in increments of 5 psi up to 60 psi. When
the pressure is applied to the drain inlet with the valve in the closed position,
there shall be no leakage from any portion of the valve.
4.6.2.1.2.2 With the unit installed in a suitable setup such that the valve
inlet port is submerged in fuel or ether suitable liquid, air pressure varying
from 0- to 5-psi gage shall be applied to the valve outlet and exterior body
of the valve with the valve in the closed position. There shall be no leakage
ac any time from any portion of the valve. The test shall be repeated with the
valve open and the outlet port plugged. There shall be no leakage from any part
of the valve.
4.6.3 Fuel resistance and extreme temperature.- The fuel resistance and
extreme temperature tests shall be conducted in accordance with table I.
4.6.4 Vibration.- The valve, in the closed position, shall be adequately
mounted on the vibration device with fluid pressure applied to the inlet port
and with the outlet port open, and subjected to the three vibration scanning
cycle tests listed in table II. The test shall be conducted at room temperature.
fluid pressure and 5-psi air suction
This test shall be repeated, using
in lieu of 60-psi fluid-pressure. There shall be no fluid leakage during the
positive pressure tests, and air leakage shall not exceed 10 cc per minute of
free air during the 5-psi air suction test. There shall be no evidence of
damage to the valve or loosening of parts as a result of the test. After this
test, the valve shall meet the requirements if the leakage test (4.6.2.1.2).
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