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Page Title:
Disc rupture and valve closure test |
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|  MIL-V-82440(OS)
Test conditions. Unless otherwise specified, the valve shall
4.5.2
be subjected to the acceptance tests under the following conditions:
Temperature:
a.
Room ambient +32 F to +98 F
Altitude:
Normal ground atmoshperic
b.
pressure
Vibration:
c.
None
d.
Humidity:
Room ambient.
4.5.3
Test equipment and set-up.
Hydraulic supply
a.
0
to 4700 psig minimum
Pressure gage
b.
0
to 5000 psig, accuracy
1/2 percent full scale
Dry inert gas supplies
c.
0
to 470 psig, 0 to 160 psig
Test procedures.
4.5.4
Disc rupture and valve closure test. The valve shall be
4.5.4.1
assembled to the test fixture in accordance with Figure 1. A gas pressure
of 100 10 psig shall be applied to the inlet port. A second source
of pressure shall be connected to the pilot port. Apply a gas pressure
of 450 psig to the pilot port. This pilot port pressure shall cause
the piston knife to sever the disc. Remove inlet and pilot port pressures.
Apply dry inert gas at a supply pressure of 150 10 psig to the inlet
There
port for 5 minutes minimum with the valve submerged in water.
shall be no evidence of leakage. Disassemble the valve and inspect
the disc. Severing of the disc shall be evidenced by the fact that the
OD of the piston shaft at the knife end has passed through the disc. The
disc material shall remain intergral.
Pilot cylinder leak test. Assemble the valve to the fixture
4.5.4.2
Apply a hydraulic pressure of 4500 100 psig to the
without a disc.
pilot port for 5 minutes minimum. There shall be no evidence of leakage
from the inlet port or the outlet port. Reduce the pilot pressure to O
psig. Post-test servicing and maintenance shall be performed in accord-
ance with 4.5.7.
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