MS28882G
TABLE I. Valve classification.
Class |
Low temperature fuel and ambient |
High temperature |
||||
Fuel |
Ambient |
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A |
-55°C |
(-67°F) |
57°C |
(135°F) |
71°C |
(160°F) |
B |
-55°C |
(-67°F) |
94°C |
(200°F) |
177°C |
(350°F) |
C |
-55°C |
(-67°F) |
150°C |
(300°F) |
315°C |
(600°F) |
REQUIREMENTS
Intended use. These low pressure check valves are suitable for use with hydrocarbon fuels, fuel vapors, and air.
Materials. Materials shall comply to requirements listed in the procurement specification, MIL-V-7899. Finish. Finish shall comply to requirements listed in the procurement specification, MIL-V-7899. Qualification. Check valves furnished under this specification sheet shall be products which are qualified
for listing on Qualified Products List, QPL-7899. An online listing of products qualified to this specification
may be found in the Qualified Products Database (QPD) at https://assist.daps.dla.mil/quicksearch/ or
Locking of parts. Threaded parts shall be locked or safe-tied in accordance with National Aerospace Standard NASM 33540, "Safety Wiring, Safety Cabling, Cotter Pinning, General Practices for". Safety cable is allowed as an alternate to safety wire. Self-locking nuts shall not be used where loosening or disengagement could result in the nut or other parts entering the fuel system. The use of lockwashers or staking is prohibited.
Marking. The valve assembly shall be marked in accordance with MIL-STD-130, "Identification Marking of U.S. Military Property". The information should contain at least the following:
(1) Valve, Check.
(2) MS part number.
(3) Manufacturer's part number.
(4) Manufacturer's name or trade mark. Valve characteristic: See figure 1.
Valve classification: See table I.
Part or Identifying Number (PIN). The PIN is as follows:
MS28882 A - 24
Dash number Class letter Specification
3
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