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BENDIX PP-DC PARK CONTROL VALVE Manual

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®
®
Bendix
PP-DC
Park Control Valve
EXHAUST
SUPPLY 11
SUPPLY 12
DELIVERY
21
SUPPLY 11
EXHAUST
COVER
BUTTON
BUTTON
FIGURE 1 - PP-DC
PARK CONTROL VALVE
OPERATION
DESCRIPTION
GENERAL
The Bendix
®
PP-DC
park control valve is a push-pull,
The PP-DC
valve receives its supply of air from the primary
manually operable on/off valve. It is dash board-mounted
service reservoir or the secondary service reservoir, whichever
and provides in-cab control of truck or bus parking brakes.
is at the higher pressure. When the button is pushed in, the
The valve is pressure sensitive – it automatically moves from
valve delivers air to the spring brake chambers (usually
®
the applied to the exhaust position if total system pressure
through a spring brake valve such as the Bendix
SR-1
valve and a relay or quick release valve). The air releases
drops below 20 to 30 psi. Also, manually pulling the button
the spring brakes for normal vehicle operation.
will apply the parking brakes.
To apply the parking brakes, the button is pulled out, which
The PP-DC
valve body is made of non-metallic, non-
exhausts the PP-DC
valve delivery and releases air from
corrosive material, and the cover is available in two mounting
the spring brake chambers.
variations (see Figure 1). The valve is designed to accept
1/4" P.T. fittings or push-to-connect fittings that use SAE
If total system pressure drops below 20 to 30 psi, the valve
J844D non-metallic air brake tubing.
will automatically "pop out," which removes the hold-off air
in the chambers and applies the spring brakes.
Ports:
PARKING BRAKES RELEASED
Port
Embossed I.D.
Primary Reservoir Supply
Supply 11
To release the parking brakes, the push-pull button is pushed
Secondary Reservoir Supply
Supply 12
in. The PP-DC
valve plunger moves, closing the exhaust
Delivery
Delivery 21
port with the exhaust seal and allowing the plunger o-ring to
move past the guide spool. Supply air then travels out the
Exhaust
Exhaust 3
delivery port to release the brakes.
Operating pressure: 150 psi max.
Note that Figure 3 shows the primary service reservoir
Operating temperature: -40° to 200°F
supplying the PP-DC
valve. The double check valve
Basic valve weight: Approximately .8 lbs.
diaphragm has sealed the secondary reservoir supply port
and allows air to pass from the primary reservoir into the
PP-DC
valve.
1

   Summary of Contents for BENDIX PP-DC PARK CONTROL VALVE

  • Page 1

    ® ™ the applied to the exhaust position if total system pressure through a spring brake valve such as the Bendix SR-1 valve and a relay or quick release valve). The air releases drops below 20 to 30 psi. Also, manually pulling the button the spring brakes for normal vehicle operation.

  • Page 2

    1. Park the vehicle on a level surface, apply the system pressure has been depleted. parking brakes, and always block the wheels. ® 8. Use only genuine Bendix replacement parts, Always wear safety glasses. components and kits. Replacement hardware, 2. Stop the engine and remove ignition key when tubing, hose, fittings, etc.

  • Page 3

    BUTTON PLUNGER O-RING PLUNGER GUIDE SPOOL SECONDARY SERVICE RESERVOIR DELIVERY SUPPLY EXHAUST SEAL PRIMARY SERVICE EXHAUST RESERVOIR FIGURE 3 - SPRING BRAKES RELEASED (PRIMARY RESERVOIR SUPPLY) BUTTON PLUNGER O-RING PLUNGER GUIDE SPOOL SECONDARY SERVICE RESERVOIR DELIVERY SUPPLY EXHAUST SEAL PRIMARY SERVICE EXHAUST RESERVOIR FIGURE 4 - SPRING BRAKES RELEASED (SECONDARY RESERVOIR SUPPLY)

  • Page 4

    PREVENTIVE MAINTENANCE means to control supply line pressure. Connect a small Important: Review the Bendix Warranty Policy before volume with a gauge to the delivery port. performing any intrusive maintenance procedures. A warranty...

  • Page 5

    BUTTON SCREW COVER CHECK VALVE SEAT GUIDE SPOOL BODY PLUNGER STEM PLUNGER INDEX TABS FIGURE 6 - EXPLODED VIEW...

  • Page 6

    NOTE: BEFORE PLACING THE VEHICLE BACK INTO 4. Remove plunger spring(6) and discard. SERVICE, PERFORM THE “LEAKAGE AND OPERATIONAL TESTS” IN THIS MANUAL. BW1739 © 2007 Bendix Commercial Vehicle Systems LLC. All rights reserved. 6/2007 Printed in U.S.A.

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