MIL-DTL-23450D
4.4.7.2 R-22 valve seat (types I and II). The valve seat for types I and II R-22 valves shall meet the
requirements specified in 3.5.5. The following details shall apply:
a. The test is to be performed using the fixture described on figure 1.
b. With 125 ±2 psig (8.62 ±0.14 bar) applied to the inlet of the fixture and with the expansion valve
set at the bulb reference temperature specified in MS17982.
c. Close the outlet valve "A" and allow the pressure to rise.
d. The seat leakage shall be measured by the rise in outlet gage pressure in a given amount of
elapsed time after closing of hand valve "A".
e. The maximum allowable pressure rise shall not exceed the values shown below.
MS17982 dash
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
number
Seat leak pressure
12
12
12
12
12
12
12
12
12
12
25
25
rise rate
(0.83) (0.83) (0.83) (0.83) (0.83) (0.83) (0.83) (0.83) (0.83) (0.83) (1.72) (1.72)
psig/min (bar)
f. Any nonconformance with the above pressure rise rate shall constitute failure of this test.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Controls Point's packaging
activities within the Military Service or Defense Agency, or within the Military Service's System
Commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. The thermostatic expansion valves covered by this specification are intended for
use with military standard refrigeration and air-conditioning equipment. Such applications are as follows:
Navy ship board applications, aircraft ground support equipment and weapon system testing equipment.
This reliability is obtained by first article testing. The first article testing assures through stringent testing
that these valves will operate for long periods at sea and in harsh environment conditions. The selection
of a particular valve for a specific application can be determined as specified in MS17982, as applicable
(see table III).
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