MIL-DTL-3155D(SH)
4.3.1.2 Sampling for examination. A random sample of valves shall be selected from each lot for the
examination specified in 4.4 with conformance based on the sampling requirements of ANSI/ASQ Z1.4, at
inspection level III.
TABLE VI. Qualification and conformance inspections.
Characteristic
Requirement
Qualification
Conformance
Temperature-regulating valve
Thermostat
Materials
Removable parts
Shock
Dimensions and tolerances
Pressure capacity
Valve operation
Valve unit
Thermostat
Bellows
Capillary tubing
Bulbs
Manually operable element
Bulkhead stuffing box
Workmanship
4.4 Examination. Each of the temperature-regulating valves tested in accordance with 4.5 or sampled for
4.3.1.2 shall be examined and measured to verify compliance with the requirements of this specification. Materials
used in the manufacture of valves shall be examined to determine conformance to 3.3. This examination shall
encompass all visual examinations and dimensional requirements specified in table VI. Classifications of defects
are shown in table VII. Noncompliance with any specified requirements or presence of one or more defects
preventing or lessening the maximum efficiency shall constitute cause for rejection.
4.5 Test methods. Test methods shall be as listed in table VI. The requirements listed in table VI shall be
tested in accordance with the applicable tests and test paragraphs listed therein. Results of tests shall be in
accordance with the requirements paragraph listed in table VI or in the test paragraph.
4.5.1 High-impact shock test. Each type of thermostat and the largest size of each model temperature-
regulating valve shall be shock tested in accordance with MIL-S-901 for Grade A, Type A, Class I equipment. The
valve shall be tested in the open position and in the closed position. The test shall be conducted prior to the tests of
4.5.2 through 4.5.5; the correction of damage which may have occurred during shock tests shall not be performed
prior to these tests. Cause for rejection shall be evidence of fragmentation or missile effect of parts, or deformation
of parts that will cause active interference between parts.
4.5.2 Performance tests. Performance tests shall be conducted on one temperature-regulating valve of each
model, size, and type of thermostat(s) as specified in 4.5.2.1 through 4.5.2.4, inclusive, and shall be made with dry
saturated steam at a pressure of not less than 34 psig nor more than 36 psig at the valve inlet.
4.5.2.1 Valve capacity. Valve capacity shall be determined with a 25-psig back pressure at the valve outlet and
with the valve fully open.
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