MIL-PRF-8622C
4.5. l.1 Valves. Every valve shall be examined visually for critical defects. Every valve selected
as a sample unit from the lot shall be visually examined for defects to determine conformance to
this specification. The classification of defects is specified in table IV.
4.5.1.1.1 Dimensions. Every valve selected as a sample unit from the lot shall be checked
dimensionally to determine conformance to the dimensions specified in figure 1 through figure 4.
4.5.1.1.2 Identification of product. Every valve selected from a sample lot shall be examined for
defects listed in table III to determine the identification of product or marking shall conform to
3.8.
4.5.2 Leakage. With the nose adapter of the valve uncoupled, a gauge pressure of 15 psig shall
be applied to the valve inlet for a period of 2 minutes. This procedure shall than be repeated
utilizing a pressure of 2,000 psig. During these periods the valve shall meet the requirements
specified in 3.5.1. The nose adapter shall then be coupled to the valve and the adapter outlet
plugged. A pressure of 2,000 psig shall be applied to the coupled assembly for a period of 2
minutes. During this period, the coupled assembly shall meet the requirements specified in 3.5.1.
4.5.3 Pressure drop. A constant pressure shall be applied to the inlet and a flow of 55 liters per
minute maintained at the outlet. Under these conditions, the pressure drop across the valve shall
be measured. The valve shall pass the requirements specified in 3.5.2.
4.5.4 Proof pressure. The nose adapter shall be uncoupled from the valve. Removed the valve
outlet cap and the frangible disk if used, and the outlet port shall be replaced with a solid plug. A
hydraulic pressure of 3,000 psig shall then be applied to the inlet of the valve for 5 minutes.
During this period, the valve shall pass the requirements specified in 3.5.3.
4.5.5 High temperature operation. The valve shall be installed in the test chamber and the
temperature shall be raised to 160 + 5 oF ( 71.1 + 2.8 oC ) and maintained for 3 hours. After the
3-hours stabilization period and while at this temperature, the valve shall be subjected to and pass
the leakage and pressure drop tests (see 4.5.2 and 4.5.3). The valve shall pass the requirements
specified in 3.5.4.
4.5.6 Low temperature operation. The valve shall be installed in a test chamber and the
temperature shall be lowered down to -65 + 5 0F (-53.9 + 2.8 0C ) and maintained for 3 hours.
After the 3 hour stabilization period and while at this temperature, the valve shall be subjected to
and pass the leakage and pressure drop tests. The valve shall pass the requirements specified in
3.5.5.
4.5.7 Vibration. The nose adapter shall be coupled to the valve, the adapter outlet shall be
plugged, and the frangible disk shall be placed with a solid plug. A pressure of 2,000 psig shall be
applied to the outlet end of the valve. The valve shall then be continuously vibrated for a period
of 6 hours using a double amplitude of 0.018 to 0.023 inch at a varying frequency of 300 to
3,000 cpm. Every 2 hour during the vibration period and upon completion of the vibration
period, the valve shall be subjected to and pass the leakage and pressure drop tests. The valve
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