MIL-PRF-23256C
3.4.1.1 Fitting valve seal. The valve seal fitting shall conform to figure 2 to ensure proper
interface with the seal valve assembly. One fitting assembly shall be supplied and assembled in
each seal valve port. The seal valve shall be repairable. The poppet "O" ring and mechanical
filter if used shall be replaceable using hand tools. The dimensions of the O ring shall be in
accordance with figure 4.
3.4.2 Filter cartridge assembly. The filter cartridge assembly shall consist of one barrel
assembly inserted into the fitting assembly to ensure proper interface with the seal valve.
3.4.2.1 Barrel filter. The barrel filter shall conform to figure 3 to ensure proper interface
with the filter cartridge assembly and the seal valve. The filter shall have 10 micron filtration
capacity or equivalent which shall filter all gas passing through the barrel filter assembly.
3.4.3 Threads. All threads shall be in accordance with FED-STD-H28.
3.5 Performance. The seal valve shall meet all the inspection requirements specified in tables
I and II.
3.5.1 Visual examination and dimensional inspection.
3.5.1.1 Visual examination. The seal valve assembly shall conform to the requirements of
this specification when visually examined as specified in 4.5.1.1.
3.5.1.2 Dimensional inspection. The dimension of the seal valve assembly shall be in
accordance with 3.4.1 when dimensionally inspected as specified in 4.5.1.2.
3.5.2 Proof pressure. The seal valve assembly shall not show any evidence of material
failure, when tested as specified in 4.5.2.
3.5.3 Leakage. The seal valve assembly leakage shall be not greater than 0.2cc per minute at
any pressure between 200 and 3,800 psig, when tested as specified in 4.5.3.
3.5.4 Operating pressure. When the control valve is actuated to open, the seal valve
assembly shall allow a burst of gas through the control valve, when tested as specified in 4.5.4.
3.5.5 Pressure drop. The seal valve assembly shall have a pressure drop not greater than 50
psig at a flow of 1cubic foot per minute (cfm) [{28.3 liter per minute (lpm)}], when tested as
specified in 4.5.5.
3.5.6 High temperature. The seal valve assembly shall not show any evidence of mechanical
or material failure and shall meet the leakage and operating pressure requirements (see 3.5.3 and
3.5.4), when tested as specified in 4.5.6.
4
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business