MIL-PRF-25961H
3.7.6.1 Fill cycle flow rate. When the valve is in the fill-vent position and there is a gas
flow of 40 SLPM, the pressure drop shall not exceed 2.4 psig.
3.7.6.2 Vent cycle flow rate. The gaseous oxygen flow from the vent port shall be a
minimum of 70 SLPM when a CRU-59/E valve is connected to the fill inlet port and a pressure
of 34 inches of water is applied to the gas port.
3.7.6.3 Buildup cycle flow rate. The gaseous oxygen flow from the gas port shall be a
minimum of 40 SLPM with a pressure of 21 inches of water applied to the buildup port.
3.7.7 Pressure.
3.7.7.1 Proof pressure. The valve shall withstand a proof pressure of 500 psig.
3.7.7.2 Actuation pressure. The valve shall actuate with a maximum internal pressure of
350 psig.
3.7.8 Orientation. The valve shall operate in any orientation.
3.7.9 Opening force. When the valve is pressurized to 350 psig, the force applied to the
valve stem to actuate the valve from the buildup to the fill-vent position shall not exceed 50
pounds.
3.7.10 Weight. The valve weight shall not exceed 1.25 pounds.
3.7.11 Reliability. The valve shall have a mean cycle between failures (MCBF) of 200
cycles.
3.7.12 Venting endurance. The valve shall withstand 200 vent cap (see 6.10) installation
and removal cycles with a minimum system pressure of 50 psig without leakage.
3.8 Item identification. The valve shall be marked with the following information:
e. CRU-50/A
f. MIL-PRF-25961
3.8.1 Port identification. The port locations shall be marked (see Figure 2).
f
3.9 Interchangeability
unctionally and dimensionally interchangeable.
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