MIL-DTL-23953D(SH)
4.3.1 Components. Visual inspection shall be performed in accordance with MIL-STD-1308 on the following
valve components:
a.
Body
b.
Cap
c.
Nut
d.
Deflector
e.
Needle Seat
f.
Cap
g.
Needle
h.
Guide
i.
Poppet
j.
Housing
4.3.2 Production valves. Each production valve shall be examined for conformance inspection as specified in
table IV.
4.4 Test methods.
4.4.1 Safety. Some of the tests outlined in this section require the use of very high-pressures and low
temperatures. Personnel performing such tests shall take adequate preventative measures to prevent personal injury.
4.4.2 Dimensions and visual. The sample valve shall be disassembled and visually and dimensionally
examined to determine conformance with the requirements of this specification and the valve drawings. On
reassembly a new poppet insert shall be installed, selected randomly from those provided with the test valve. Any
difficulty in assembly or disassembly shall be noted.
4.4.3 Disassembly and examination after test. The valve shall be disassembled and visually and dimensionally
examined for damage, wear, and operation of parts.
4.4.4 Nondestructive test. Nondestructive tests shall be conducted in accordance with S9074-AR-GIB-010/278
and T9074-AS-GIB-010/271. Failure of the valve or component to meet the acceptance criteria of
S9074-AR-GIB-010/278 shall be cause for rejection.
4.4.4.1 Cast valve bodies. Cast valve bodies shall be radiographed in accordance with S9074-AR-GIB-010/278.
Complete coverage of the casting is required. Failure of the valve body to meet the acceptance criteria for
nonferrous castings in S9074-AR-GIB-010/278 shall be cause for rejection. Radiographed components shall be
marked in accordance with 3.7.4.
4.4.5 Proof test. With the outlet port capped off, 6,750 psig of water shall be applied to the inlet port for a
minimum of 5 minutes. There shall be no external leakage, permanent distortion, or structural failure. Needle valve
may be closed to perform test. At completion, the pressure shall be vented before examining the valve as specified
in 4.4.3.
4.4.6 Needle assembly test. Test fittings shall be installed on inlet and outlet of valve body. Water pressure
shall be applied to the test fitting and water shall be allowed to flow through needle seat before closing the needle
assembly to remove any contamination. The needle assembly shall be closed and the pressure shall be increased to
6,750 psig and held for 5 minutes. No leakage shall be allowed.
4.4.7 Poppet vent assembly test. Test fittings shall be installed on inlet and outlet of valve body. Pressure
(nitrogen or air) shall be applied to test fitting and pressurized to 50 psig for 3 minutes. Leakage from the needle
assembly port located in the housing shall be monitored/measured. Leakage shall not exceed 0.05 lbm/sec
(39.6 scfm). The test shall be repeated at 4,500 psig for 3 minutes and leakage shall not exceed 0.05 lbm/sec
(39.6 scfm).
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