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MIL-V-24694(SH)
4.5.2 Ambient temperature.  Unless otherwise specified herein, the tests
shall be conducted at a room temperature of 15 to 35C, measured within 0.3 meter
of the test sample.
4.6 Test methods.  Cartridge-type relief valves shall be tested in a
housing designed to accept the valve and having inlet and outlet ports. The
valves shall be free of chatter, surging or squeal under any condition or
combination of conditions in this specification.
4.7 Tests and examination.
4.7.1 Visual and dimensional examination.  Valves shall be visually and
dimensionally examined to determine conformance to the applicable specification
sheet and any other applicable requirements of this specification.
Proof pressure.  A proof pressure of 69 bars (1000
or 200
4.7.2
the maximum possible pressure setting, whichever is greater, shall be
percent of
applied to
the inlet port of the valve with the return port blocked and held for
2 minutes.
There shall be no external leakage or evidence of permanent deforma-
quality conformance, proof pressure shall be applied for a minimum of
tion.  For
30 seconds
to assure that no leakage is present.
4.7.3 Performance tests (minimum setting).  The following tests shall be
conducted with the valve adjusted to the minimum nominal set pressure specified
for its class as identified in the applicable specification sheet.  Valves
adjustable to a range of more than one class need only be tested at the minimum
setting of the range.  Any evidence of chatter, surging, or squeal under any test
condition shall be cause for rejection.  Leakage measurements shall be taken in
the third minute of a 3-minute period.  For quality conformance, test time may
be reduced to 1 minute.
4.7.3.1 Rated flow differential pressure-  The pressure shall be increased
until rated flow as identified in the applicable specification sheet is passed
through the valve.  The pressure at which this flow occurs shall be recorded as
the rated flow pressure and its value shall be not greater than that identified
on figure 1 for a given nominal set pressure.  Fluid temperature shall not exceed
40C for this test.
4.7.3.2 Reseat.  With rated flow through the valve, the inlet pressure
shall gradually be reduced until leakage not greater than the reseat leakage
specified in the applicable specification sheet can be determined.  The pressure
at which this leakage rate occurs shall be recorded as the reseat pressure and
its value shall be not less than that identified on figure 1.
4.7.3.3 Internal leakage.
4.7.3.3.1 Decreasing pressure leakage.  The reduction of pressure shall be
continued, and the leakage rate observed et a pressure equivalent to 75 percent
of the set pressure.  Unless otherwise specified (see 3.1), leakage at this
pressure shall not exceed 1 cubic centimeter
per minute.
9

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