MIL-PRF-23256C
4.5.2 Proof pressure. The seal valve assembly shall be subjected to the following conditions:
a. Inlet port pressurized to 5,500 ±100 psig for a minimum of three minutes with the
seal valve not mated to the control valve.
b. Inlet port pressurized to 5,500 ±100 psig for a minimum of three minutes with the
seal valve mated to the closed control valve.
The seal valve assembly shall meet the proof pressure requirements specified in 3.5.2.
4.5.3 Leakage. The seal valve assembly shall be checked for leakage with its inlet port
pressurized to each of the following pressures for a minimum of three minutes. The outlet port
shall not be mated to the control valve.
a. 200 psig
b. 1,000 psig
c. 2,200 psig
d. 3,000 psig
e. 3,800 psig
The test shall be repeated with the seal valve mated to the closed control valve. The seal valve
shall meet the leakage requirements specified in 3.5.3.
4.5.4 Operating pressure. The inlet of the seal valve assembly shall be pressurized to
3,800 ±100 psig. The seal valve shall then be mated to a functional control valve (see 4.4.4). The
control valve shall be actuated electrically from closed to open and back to close. The seal valve
assembly shall meet the operating pressure requirements specified in 3.5.4.
4.5.5 Pressure drop. The seal valve assembly shall be mated to the test fixture (see 4.4.4).
With the inlet maintained at a pressure of 3,000 ±100 psig and a flow of 28.3 lpm (1 cfm) the total
pressure drop shall be determined. The system test pressure drop shall be determined and
subtracted from the total pressure drop. The resultant differential pressure shall meet the pressure
drop requirements specified in 3.5.5.
4.5.6 High temperature. The seal valve shall be subjected to the high temperature test in
accordance with MIL-STD-810, Method 501.3, Procedure I, except the temperature shall be
250°F (121°C). The seal valve assembly shall be mated to the test fixtures (see 4.4.4). While at
test temperature conditions, the inlet shall be pressurized to and maintained at 3,600 to 3,800
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