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Page Title:
Examination after first article tests |
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|  MIL-V-24642(SH)
requirements of this specification and drawings. Particular emphasis shall
be placed on the dimensions, finishes, and condition of the guiding and seatin
surfaces and latches.
4.5.1.1 Disassembly.
In lieu of disassembly for examination, valve may
be visually and dimensionally examined prior to assembly.
4.5.1.2 Examination after first article tests. Valve shall be disassemb
and visually and dimensionally examined for damage and wear after completion o
first article tests. Disassembly and reassembly shall be performed to determi
the practicability of maintaining a valve of this design (see 3.4.4).
4.5.2
Quality conformance.
4.5.2.1 Visual examination. Each valve shall be visually examined to
verify compliance with the requirements of the specification and drawings.
4.5.2.2 Nondestructive tests.
Nondestructive tests shall be performed a
required by MIL-STD-278.
4.6 Tests.
4.6.1 Operational. The valve shall be assembled and subjected to
operating pressure and temperature. The valve gland exhaust connection shall
be connected to a vacuum system and monitored with a manometer to determine
gland leakage as specified in 3.4.11.5. Stem leakage shall not exceed that
specified in 3.4.11.5. The valve shall be manually tripped closed from its
fully open position as well as reset as specified in 3.4.12.2 and manually
closed . The valve response time, reset time, and the force required to
manually open and close the valve shall be recorded and they shall not exceed
the values specified herein.
4.6.2 Flow. A flow test shall be conducted in accordance with ISA
S75.02. Flow rating shall comply with the value specified in 3.5.1.
4.6.3 Shock and vibration. The valve shall successfully pass the shock
tests of MIL-S-901, grade A, class I, and the vibration tests of MIL-STD-167-1,
type I and a post shock and vibration operational test. Operation during
testing shall be as required in 3.5.5. Post shock operational tests shall be
in accordance with 4.6.1. Post shock seat leakage and hydrostatic tests shall
be in accordance with 3.5.2 and 3.5.6.
4.6.4 Life cycle. A life cycle test shall be conducted to ensure proper
valve operation throughout the required valve life. Life cycle test phases and
conditions shall be as specified in tables IV and V. At the conclusion of
phase I and phase III of the test, the valve shall be subjected to a hydro-
static pressure test and a seat leakage test. The valve shall then be
disassembled and inspected in accordance with MIL-STD-278, Cycles incurred
during other tests shall not be counted toward the life cycle test.
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