MIL-DTL-87223A (USAF)
3.2.4 Protective treatment.
Materials shall be protected from deterioration in a manner that will in no way prevent
compliance with the performance requirements of this specification. The valve shall resist
corrosion and deterioration due to fuels, salt fog, microorganisms, moisture, hydraulic fluids,
lubricating oils, grease, ozone, or atmospheric conditions likely to be encountered in storage or
normal service. Protective coatings which might crack, chip, or scale during normal service or
storage life or under extremes of environmental conditions shall not be used.
3.3
Standard parts.
Military standard parts shall be used when they suit the purpose. Use of non-standard parts
requires contracting officer approval prior to use.
3.4
Design and construction.
The valve shall be designed to pass air at a regulated pressure to aircrew member's anti-G suit
and shall contain provisions for suit exhaust. The valve shall include inlet and outlet fittings that
incorporate swivel features. The fittings shall have a diameter and finish compatible with the
aircraft inlet hose and the G-suit delivery hose. The outlet pressure shall be a function of the
acceleration force applied to the valve in the +Gz (see 6.3) direction. The design shall enable
manual operation (push-to-test) of the valve and shall provide means to simulate acceleration
forces. The valve shall be designed to perform as specified in 3.5. Moisture in the air source to
the valve shall not adversely affect operation of the valve.
3.4.1 Installation.
The valve shall be designed such that it can be properly installed in the applicable aircraft. This
includes proper alignment with the mounting brackets and connections with the inlet and outlet
hoses. The existing control panels shall also be accommodated. There shall be no interference
with aircraft structure. Minimum requirements for installation are given on figures 1 and 2.
Proper installation shall be demonstrated as specified in 4.5.1.1.1. Should there be a conflict
between the installation demonstration specified in this document and figures 1 and 2, the
instalIation demonstration shall take precedence.
3.4.2 Relief valve.
The valve design shall include a pressure relief valve that the contractor will calibrate such that
when tested on the centrifuge, the outlet pressure shall be within the range specified on figure 3.
The valve shall not allow the outlet pressure to exceed 12 psig.
3.4.3 Lubrication.
The valve shall be designed and constructed in such a manner that no maintenance lubrication
is required.
3.4.4 Inlet screen.
The valve shall contain a corrosion-resistant steel, 30 by 30 maximum mesh, 0.010 inch
minimum wire diameter inlet screen. All inlet air shall pass through the screen.
3.5
Performance.
All specified performance requirements are based on the use of air.
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