MIL-PRF-8622C
shall pass the requirements specified in 3.5.6.
TABLE IV. Classification of defects for visual examination of valves.
Critical
Minor
1. Material imperfections - foreign matter
1 Marking missing, insufficient,
embedded
incorrect, illegible, or not permanent.
2. Surface - unclean, rough, realigned, or contains
cracks, nicks, or flaws
3. Any component missing, malformed,
fractured, or damaged
4. Any component loose or not securely restrained
5. Incorrect assembling or improper positioning
of components
6. Any functioning part that works with difficulty
7. Faulty workmanship or other irregularities
4.5.8 Endurance. The valve shall be connected to a 2,000 psig source of pressure. The coupling
nut of the valve shall then be connected and disconnected to and from the valve. This shall
constitute one cycle. During the cycling, the initial valve inlet pressure shall be 1,800 psig that
shall be permitted to decay to a minimum of 300 psig. Flow rate through the valve during cycling
shall be 50 liters per minute for 10 seconds minimum. There shall be a minimum of 5 seconds
between each cycle. The valve shall be subjected to 250 cycles and shall pass the requirements
specified in 3.5.7. At the conclusion of the test, the valve shall be subjected to and pass the
leakage and pressure drop tests.
4.5.9 Torque.
4.5.9.1 Opening. A pressure of 1,800 psig shall be applied to the valve inlet. While maintaining
this pressure, a torque of 35 inch-pounds maximum shall be applied to the valve coupling nut in
the opening direction. During these conditions, the valve shall pass the requirements specified in
3.5.8.1.
4.5.9.2 Sealing. A pressure of 1,800 psig shall be applied to the valve inlet. While maintaining
this pressure, a torque of 150 inch-pounds maximum shall be applied to the valve coupling nut.
During these conditions, the valve shall pass the requirements specified in 3.5.8.2.
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