MIL-DTL-5500G
4.3.2 Burst pressure. The caps, when seated in a body conforming to MIL-PRF-6164
shall withstand a burst pressure up to 20,000 psi, without failure, distortion, or evidence of
leakage in any manner.
4.3.3 Pull-up. Three new caps and the 3 caps aged in air and hydraulic oil, shall be
assembled and disassembled on an MIL-PRF-6164 valve, reference MIL-PRF-6164 at least 30
times at a wrench torque of 50 inch-pounds minimum. Each assembly and disassembly shall
consist of a complete tightening to the specified torque and then loosened until the seat has
ceased making contact with the valve body.
4.3.3.1 Cold-soak pull-up. At least 10 of these pull-ups shall be made at a temperature
not warmer than -65°F (-54°C) after the caps have been exposed to this temperature for a
minimum of 72 hours. During this cold-soaking period, the caps shall not be tightened on the
bodies.
4.3.4 Impulse. The same caps as used in the pull-up test shall be installed on an MIL-
PRF-6164 valve and impulse cycled from 0 to 1,500 psi pressure at the pace of 25 ±10 cycles per
minute for 50,000 impulses minimum. The impulse medium shall be hydraulic oil conforming to
MIL-PRF-83282. At least 5,000 of these impulses shall be made with the impulse medium and
the caps at a temperature not warmer than -65°F (-54° C). The caps shall be held at this
temperature for 72 hours prior to the start of the -65°F (-54° C) impulse cycles. Leakage shall
not exceed the values specified (see 3.6).
4.3.5 Leakage. The caps used on the impulse test specified (see 4.3.4) shall be loosened
and retightened on MIL-PRF-6164 valves with 15 to 20 inch-pound torque. The caps shall be
tested for 1 hour at 10 psi and for 1 hour at 5,000 psi. No leakage shall occur during the 1 hour
test periods.
4.3.5.1 Caps. The caps, still on the bodies at the same torque, shall be chilled to at least
-65°F (-54°C) for 24 hours while maintaining air pressure of not less than 1,000 psi in the inside
of the caps. No leakage shall occur.
4.3.5.2 Leakage check. Leakage may be checked by immersion under water or other
transparent liquid or by securely fastening a deflated rubber bag on the valve body in such a
manner that all leakage from the cap would be trapped in the bag.
4.4 Examination after test. After completion of the tests enumerated herein, all the caps
shall be examined for deterioration and failure. There shall be no separation of the seat from the
swivel seat plate, and the swivel shall not be tightly jammed into the housing. There shall be no
evidence of excessive wear or deterioration, such as flaking, cracking, or cutting of the seat
material. A compression set of the seat in the form of a circular groove at the contact point of
the seat on the MIL-PRF-6164 stem and a slight roughening of the seat material, shall not be
interpreted as excessive wear or deterioration.
4.5 Conformance inspections. The conformance inspections shall consist of individual
tests and sampling tests.
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