MIL-PRF-83870C
3.5.5 Cold start. The filter element shall withstand 200 pounds per square inch (psi) differential pressure across the
element for 10 flow cycles at -65°± 5°F without permanent deformation or a bubble point decrease of greater than 10%
of the initial bubble point.
3.6 Interchangeability. All parts having the same manufacturer's part number shall be functionally and
dimensionally interchangeable.
3.7 Item identification. The filter shall be permanently and legibly marked with the following information:
a. Manufacturer's name (Optional)
b. Manufacturer's CAGE code
c. Manufacturer's part number
d. Manufacturer's serial number
e. M83870-XX
f. Collapse pressure
3.8 Filter element pressure relief valve.
3.8.1 M83870-6 pressure relief valve (see figure 5). The cracking (opening) pressure of the pressure relief valve shall
be 100 ± 10 psi. The differential pressure across the pressure relief valve shall be a maximum of 160 psi when the test
fluid flow rate through the pressure relief valve is 11 gal/min. The pressure relief valve shall reseat (close) at a minimum
pressure of 65 psi.
3.8.2 M83870-7 pressure relief valve (see figure 6). The cracking (opening) pressure of the pressure relief valve shall
be 50 ±10 psi. The differential pressure across the pressure relief valve shall be a maximum of 75 psi when the test fluid
flow rate through the pressure relief valve is 3 gal/min. The pressure relief valve shall reseat (close) at a minimum
pressure of 38 psi.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows (see 6.2).
a. Qualification inspection (see 4.2)
b. Conformance inspection (see 4.3)
4.2 Qualification inspection. If required (see 3.1 and 6.3), qualification inspection shall be performed on four filter
elements of each part number. The filter elements shall be subjected to the tests indicated in table III.
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