Bendix Commercial Vehicle Systems RV-3 PRESSURE REDUCING VALVE 3/04 - Manual

1
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SD-03-3515
GENERAL DESCRIPTION
The Bendix ® RV-3 ™ pressure reducing valve is a normally-
open pressure control device. The function of the RV-3
valve is to reduce system air pressure and maintain a
constant specifi ed pre-set pressure below that of system
pressure. Various pressure settings can be obtained
through the use of springs and shims in combination.
The Bendix RV-3 valve has one supply port and one
delivery port. A single pipe plug is installed in the control
port and should remain in place for most applications of
the RV-3 valve. A rubber exhaust diaphragm is installed
in the end of the valve opposite the supply port. Two .28”
(7.1mm) mounting holes are cast into the valve body.
MOUNTING LOCATION
Care should be given to assure proper mounting location.
The valve should be mounted with the exhaust pointed
downward (toward the road surface), and mounted high
on the frame rail. It should be away from road spray and
debris. Unprotected or exposed exhaust ports can allow
migration of road contaminants into the valve, which may
cause accelerated wear or unintended operation.
OPERATION
The spring force exerted on the piston determines the
delivery pressure of the valve. With no air pressure present
at the supply port, the inlet valve is unseated and open while
the exhaust passage through the center of the piston is
sealed by the exhaust valve. Compressed air entering the
supply port fl ows out the delivery port. Air simultaneously
fl ows between the piston stem and valve body to the
FIGURE 1 - BENDIX ® RV-3 ™ INVERSION VALVE
Bendix ® RV-3 ™ Pressure Reducing Valve
PLUGGED
PORT
MOUNTING
HOLES
SUPPLY
PORT
DELIVERY
PORT
RETAINER
PISTON
SUPPLY CAP
NUT O-RING
EXHAUST
DIAPHRAGM
EXHAUST NUT
OUTER AND/OR
INNER SPRING
SHIMS
PISTON O-RING
VALVE BODY
INLET/EXHAUST
VALVE
SUPPLY
CAP NUT
VALVE STOP
INLET VALVE SPRING