Bendix-commercial-vehicle-systems PP-DC PARK CONTROL VALVE 6/07 User Manual download pdf

SD-03-3619

Bendix

PP-DC

Park Control Valve

FIGURE 1 - BENDIX

PP-DC

PARK CONTROL VALVE

SUPPLY

BUTTON

EXHAUST

SUPPLY

BUTTON

COVER

EXHAUST

SUPPLY

DELIVERY

DESCRIPTION

The Bendix

PP-DC

park control valve is a push-pull,

manually operable on/off valve. It is dash board-mounted

and provides in-cab control of truck or bus parking brakes.

The valve is pressure sensitive—it automatically

moves from the applied to the exhaust position when

total system pressure drops below 20 to 40 psi. (Note

that this is a Bendix

product specification and not a

mandated requirement. Refer to Bendix Technical

Bulletin TCH-003-051). Also, manually pulling the

button will apply the parking brakes.

The PP-DC valve body is made of non-metallic, non-

corrosive material, and the cover is available in several

variations (see Figure 1). The valve is designed to accept

pipe thread ﬁ ttings or push-to-connect ﬁ ttings that use SAE

J844 non-metallic air brake tubing.

Ports:

Port Embossed I.D.

Primary Reservoir Supply SUP 11

Secondary Reservoir Supply SUP 12

Delivery DEL 21

Exhaust EXH 3

OPERATION

GENERAL

The PP-DC valve receives its supply of air from the primary

service reservoir or the secondary service reservoir,

whichever is at the higher pressure. When the button

is pushed in, the valve delivers air to the spring brake

chambers (usually through a spring brake valve such as

the Bendix

SR-7

valve and a relay, or quick release,

valve). The air releases the spring brakes for normal vehicle

operation.

To apply the parking brakes, the button is pulled out, which

exhausts the PP-DC valve delivery and releases air from

the spring brake chambers.

When total system pressure drops below 20 to 40 psi,

the valve will automatically “pop out,” which removes the

hold-off air in the chambers and applies the spring brakes.

PARKING BRAKES RELEASED

To release the parking brakes, the push-pull button is

pushed in. The PP-DC valve plunger moves, closing the

exhaust port with the exhaust seal and allowing the plunger

o-ring to move past the guide spool. Supply air then travels

out the delivery port to release the brakes.

1 2 3 4 5 6

Summary of Contents

Page 1 - Park Control Valve

1® SD-03-3619Bendix® PP-DC® Park Control ValveFIGURE 1 - BENDIX® PP-DC® PARK CONTROL VALVESUPPLY 12BUTTONEXHAUST 3SUPPLY 12BUTTONCOVEREXHAUST 3EXHAUST

Page 2 - SERVICE CHECKS

2FIGURE 2 - TYPICAL 4 X 2 TRUCK SCHEMATIC WITH BENDIX® PP-DC® PARK CONTROL VALVENote that Figure 3 shows the primary service reservoir supplying the B

Page 3

3FIGURE 4 - PARK BRAKE RELEASED (Secondary Reservoir Supply)FIGURE 3 - PARK BRAKE RELEASED (Primary Reservoir Supply)PRIMARY SUPPLYSECONDARY SUPPLYEX

Page 4 - ASSEMBLY

4LEAKAGE AND OPERATIONAL TESTSTo perform the tests that follow, connect two separate 120 psi air sources to the Bendix® PP-DC® valve supply ports. Tee

Page 5

5FIGURE 7 - EXPLODED VIEWBODYINDEX TABSGUIDE SPOOLPLUNGER STEMCOVERCHECK VALVE SEATBUTTONSCREW142783956PLUNGER

Page 6

65. Install o-ring(1) onto the guide spool. Then install the guide spool over the plunger and into the body. Press the guide spool into place ﬁ rmly

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Bendix-commercial-vehicle-systems PP-DC PARK CONTROL VALVE 6/07 User Manual

Browse online or download User Manual for Equipment Bendix-commercial-vehicle-systems PP-DC PARK CONTROL VALVE 6/07. Bendix Commercial Vehicle Systems PP-DC PARK CONTROL VALVE 6/07 User Manual

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