Bendix Commercial Vehicle Systems RD-3 PUSH-PULL VALVES - Manual

1
BENDIX ® PP-1 ®
VALVE
BENDIX ® PP-5 ™
VALVE BENDIX ® RD-3 ™
VALVE
SD-03-361
1
Bendix ® PP-1 ® , PP-2 ™ , PP-5 ™ , PP-8 ™ , & RD-3 ™ Push-Pull Type
Control Valves
FIGURE 1 - PUSH-PULL TYPE CONTROL VALVES
BENDIX ® PP-2 ™
VALVE
DESCRIPTION
The PP valves are push-pull manually operable on-off air
control valves with an exhaust function. Most are pressure
sensitive, so that they will automatically move from the
applied to the exhaust position as supply pressure is
reduced to a certain minimum, depending on the
spring installed. The exception to this is the Bendix
®
PP-8 ™ valve and some Bendix ® PP-1 ® valves which
do not contain a spring. The PP-8 ™ valve also has a
larger diameter shaft for button mounting so that when
installed on the same panel with other PP valves the
buttons cannot be inadvertently mixed. The PP-8
™ valve is
normally used to operate tractor spring brakes independently
from the trailer.
The Bendix ® PP-5 ™ valve is unique in having an auxiliary
piston in the lower cover which, upon receiving a pneumatic
signal of 18 psi or more, will cause the valve to move
from the applied to the exhaust position from a 100 psi
application.
The Bendix ® RD-3 ™ valve differs slightly in that it normally
remains in the exhaust position and requires a constant
manual force to hold it in the applied position.
The PP-2 ™ valve has an auxiliary port which may be
plumbed into a service brake line to release the spring
brakes if a service application is made, preventing
compounding of forces on the foundation brakes.
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 PP valves should be inspected every 6 months or
1500 operating hours, whichever comes fi rst, for proper
operation. Should the PP valves not meet the elements
of the operational tests noted in this document, further
investigation and service of the valve may be required.
BENDIX ® PP-8 ™
VALVE