BENDIX PP-1 Service Data

Bendix PP-1 , PP-2
® ®
Bendix
®
PP-1 Valve
®
Figure 1 – Push-Pull Type Control Valves
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
™
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.
, PP-5 , PP-8 , & RD-3
™ ™ ™
Bendix
®
PP-2 Valve
™
PP-1 valves which
® ®
Push-Pull Type Control Valves
™
Bendix
®
PP-5 Valve
™
PP-8
The Bendix PP-2
®
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.
PURPOSE OF THIS MANUAL
®
This document is intended to act as a source of maintenance
information to those involved in servicing Bendix
type control valves.
ADDITIONAL SUPPORT
For additional service information, contact the Bendix
Tech Team online at techteam@bendix.com, or by calling
1-800-AIR-BRAKE (1-800-247-2725), option 2. Tech
Team members are available Monday through Thursday,
8:00 a.m. to 6:00 p.m. and Friday, 8:00 a.m. to 5:00 p.m. ET.
Bendix
RD-3
Bendix
®
Valve
™
valve has an auxiliary port which
™
®
Valve
™
push-pull
®
1