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|  MIL-V-29592(AS)
expelled from the outlet port during one cycle, within the specified limit on
the applicable military specification sheet. There shall be no structural
failure permanent deformation.
4.7.4 Functional.
4.7.4.1 Opening and air venting. (Class I only). Perform the functional
test with the automatic air vent valve installed in a test circuit similar to
Figure 1. The selector valve shall be set to the air side of the reservoir.
Slowly increase the air pressure until air bubbles are observed in the air
trap. The automatic air vent valve shall open and vent air as indicated by
bubbles in the water beaker prior to reaching the minimum reservoir pressure,
as indicated in the applicable military specification sheet. With the
pressure adjusted to the minimum reservoir pressure, the minimum air flow rate
shall be as specified in the applicable military specification sheet.
Continue increasing the air pressure until the maximum reservoir pressure, as
specified on the applicable military specification sheet, plus 5 psi is
reached. Air shall continue to flow without interruption as indicated by air
bubbles in the water beaker.
4.7.4.2 Closing and oil shut off.
(Class I only). At the completion of
4.7.4.1, the air pressure shall be adjusted to the minimum reservoir pressure
(on the applicable military specification sheet) minus 10 psi. The selector
valve shall be set to the oil side of the reservoir and oil introduced into
the air vent valve as the residual air in the test apparatus is vented through
the automatic air vent valve. The automatic air vent valve shall close and
prevent hydraulic fluid expulsion within the prescribed rate (see applicable
military specification sheet for the maximum oil expulsion rate). The
selector valve and vent valve shall be adjusted to drain the oil from the
automatic air vent valve and tubing leading to it. The air pressure shall be
readjusted to the maximum hydraulic pressure plus 5 psi. The procedure shall
be repeated at this pressure and the automatic air vent valve shall vent air
and close, preventing oil from being expelled above the prescribed limit.
4.7.4.3 Adverse attitude. (Class I only). The automatic air vent valve
shall be mounted at an angle of 80 degrees from the vertical. The opening and
air venting test (4.7.4.1) and the closing and oil shut-off test (4.7.4.2)
shall be repeated with no failure.
4.7.5 Rapid rate of pressure rise. (Class I only). With the automatic
air vent valve mounted in a test circuit similar to Figure 1, and the initial
air pressure at O psig, set the selector valve to the air side of the
reservoir. Increase the air pressure rapidly at a rate of rise between 100
and 200 psi per second until the maximum reservoir pressure (on the applicable
military specification sheet) plus 5 psi is reached. Manual or automatic
pressure control may be used providing the required rate of rise is maintained
and verified by an electronic recording device. The automatic air vent valve
shall continue to vent air without interruption or premature shut off. This
test shall be repeated 10 times without failure.
4.7.6 Reverse air flow. A hose shall be connected to the inlet to the
automatic air vent valve and the opposite end of the hose placed in a beaker of
water open to the atmosphere. A suitable source of clean, dry air or nitrogen
shall be connected to the air vent port. The air pressure shall be adjusted
t 7 2 psi. There shall be no reverse air flow through the valve as indica-
ted by bubbles in the beaker of water.
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