MIL-PRF-8622C
applicable FED-STD-H28 (see figures 1, 3, and 4).
3.4.10 Dimensioning and tolerancing. Dimensioning and tolerancing of the valve shall be in
accordance with ASME - Y14.5.
3.5 Performance.
3.5.1 Leakage. The valve shall not leak more than 2 milliliters (ml) per minute when tested as
specified in 4.5.2.
3.5.2 Pressure drop. The pressure drop across the valve shall be not greater than 5 psig when
tested as specified in 4.5.3.
3.5.3 Proof pressure. The proof pressure of the valve shall not leak more than 2 ml per minute
when tested as specified in 4.5.4.
3.5.4 High temperature operation. The valve shall not show any evidence of mechanical or
material failure after being stabilized and tested as specified in 4.5.5.
3.5.5 Low temperature operation. The valve shall not show any evidence of mechanical or
material failure after being stabilized and tested as specified in 4.5.6.
3.5.6 Vibration. The valve shall not show any evidence of mechanical or material failure after
tested as specified in 4.5.7.
3.5.7 Endurance. The valve shall not show any evidence of mechanical or material failure after
tested as specified in 4.5.8.
3.5.8 Torque.
3.5.8.1 Opening. The valve shall open fully when tested as specified in 4.5.9.1. The flow rate of
valve at fully open position is 50-65 liters per minute.
3.5.8.2 Sealing. The valve shall not leak in excess of 2 ml per minute when tested as specified in
4.5.9.2.
3.5.9 Check valve. The check valve shall not leak in excess of 2 ml per minute when tested as
specified in 4.5.10.
3.5.10 Safety disk rupture. The safety disk shall rupture between 2,700 and 3,000 psig when
tested as specified in 4.5.11.
3.5.11 Ozone resistance. The elastomer components used shall be resistant to ozone. The
elastomer components shall not show any evidence of cracking or damage when tested as
specified in 4.5.12.
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