BENDIX DV-2 AUTO RESERVOIR DRAIN VALVE Manuel - Page 2
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NOTE: If a vehicle equipped with a DV-2
valve(s) is operated in subfreezing temperatures, it
is recommended that a heated reservoir drain valve
is installed.
OPERATION
Referring to Figure 1, with no air pressure in the system, the
inlet and exhaust valves are closed. Upon charging the
system, a slight pressure opens the inlet valve (Figure 2)
which permits air and contaminants to collect in the sump.
The inlet valve remains open when pressure is ascending in
the system until maximum (governor cutout) pressure is
reached. The spring action of the valve guide in the sump
cavity closes the inlet valve. The inlet valve and the exhaust
valve are now closed (Figure 3).
When reservoir pressure drops slightly (approximately 2 psi),
air pressure in the sump cavity opens the exhaust valve
(Figure 4) and allows moisture and contaminants to be
ejected from the sump cavity until pressure in the sump
cavity drops sufficiently to close the exhaust valve.
The length of time the exhaust valve remains open and the
amount of moisture and contaminants ejected depends upon
the sump pressure and the reservoir pressure drop that
occurs each time air is used from the system.
FIGURE 1
FIGURE 3
2
™
automatic drain
Manual draining can be accomplished as follows:
Using a tool, move the wire in the exhaust port upward,
holding it in until draining is completed.
The thermostat on the heated model DV-2
valve will activate the heating element when the valve body
reaches a temperature of approximately 45°F and will
deactivate the heating element when the valve body is
warmed to approximately 85°F.
PREVENTIVE MAINTENANCE
Important: Review the Bendix Warranty Policy before
performing any intrusive maintenance procedures. A warranty
may be voided if intrusive maintenance is performed during
the warranty period.
No two vehicles operate under identical conditions, as a
result, maintenance intervals may vary. Experience is a
valuable guide in determining the best maintenance interval
for air brake system components. At a minimum, the
automatic reservoir drain valve should be inspected every 6
months or 1500 operating hours, whichever comes first, for
proper operation. Should the automatic reservoir drain valve
not meet the elements of the operational tests noted in this
document, further investigation and service of the valve may
be required.
FIGURE 2
FIGURE 4
™
automatic drain