A.

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MIL-PRF-25961H

4.6.12 Orientation. The valve shall be subjected to tests in 4.6.3 through 4.6.5, and 4.6.7

through 4.6.9 while the valve is in each of the following orientations: major axis vertical with the

fill inlet port at the bottom, major axis horizontal with the fill outlet port up, and major axis

horizontal with the fill outlet port down.

4.6.13 Functional test.

4.6.13.1 Functional test setup. The CRU-50/A valve shall be set up to simulate

installation on a LOX converter and be capable of being filled with LOX from a 30 psig source

through a CRU-59/E valve. The setup shall be also capable of holding and flowing LOX from

the fill outlet to the gas port, and of supplying gaseous oxygen to the fill outlet, gas, and buildup

ports at 350 psig. In addition, when gaseous oxygen is applied to the setup, liquid oxygen shall

be forced toward the fill outlet port.

4.6.13.2 Functional test process. Filling shall be simulated by performing the filling cycle

as specified in 4.6.13.3. When the fill process is complete, pressurize the CRU-50/A valve again

to 350 psig and then connect another CRU-59/E valve to the CRU-50/A valve. The CRU-50/A

valve shall vent and there shall be no visible LOX leakage through the CRU-59/E valve. Remove

the CRU59/E valve, repeat 4.6.13.3, and then perform the test in 4.6.6 during LOX transfer.

After the final LOX transfer and the temperature is stabilized between -65� and 32�F, the valve

shall be subjected to the test in 4.6.4. There shall be no malfunction preventing the repetition of

normal filling cycles or resulting in liquid oxygen leakage.

4.6.13.3 Filling cycle. The CRU-50/A valve shall be pressurized to 350 psig through the

fill outlet, gas, and buildup ports of the valve. With the flow off, the CRU-59/E valve in 4.6.13.1

shall be connected. This will cause the CRU-50/A valve to actuate from the buildup to the fill-

vent position. Venting shall occur from the CRU-50/A vent port. The flow shall be turned on and

the LOX shall flow through the valves until LOX emerges from the vent port. The CRU-59/E

valve then shall be disconnected.

4.6.14 Opening force. The valve shall be connected in the setup as specified in 4.6.13.1

and pressurized to 350 psig. A push scale, or any other suitable device that can interface with the

poppet assembly, shall be used to apply and measure the level of a gradually increasing force

that is required to actuate the valve to the fill-vent position. The force required to actuate the

valve and initiate venting shall not exceed 50 pounds.

4.6.15 Proof pressure. With the gas port plugged, a pressure of 500 psig shall be applied

to the fill outlet and buildup ports for a minimum of 2 minutes. The valve then shall be inspected

for permanent deformation and material damage and subjected to the tests in 4.6.3 through 4.6.5.