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SD-03-1063

FIGURE 1 - CUTAWAY AND EXTERNAL VIEW

DESCRIPTION

The Bendix

R-12P

™

pilot relay valve is designed to speed

up control signal application and release on long non-towing

trailers, towing trailers, dollies, and long wheelbase tractors.

It does this without adversely affecting the control signal.

The R-12P

™

valve replaces the current R-8P

™

valve.

Unlike a standard relay valve used as a “booster,” which

typically has a 2-4 psi differential between control and

delivery, the R-12P

™

valve has zero differential. It “speeds”

up control line signal application and release in a train

of vehicles, and it delivers the same air pressure that it

receives. This provides a uniform brake signal to all trailer

and dolly brakes, even during light applications.

The unique R-12P

™

valve feature is that it uses a supply

air pressure load to quicken the valve’s response time. By

balancing the pressure signal to all trailer and dolly brakes,

the R-12P

™

valve aids in achieving overall vehicle brake

pressure balance, timing balance, and stability.

It also substantially improves brake lining wear balance

on combination vehicles by making even the most distant

brake contribute its share of braking effort.

Figure 2 shows the R-12P

™

valve in a trailer air brake

schematic. Note that additional air lines for a towing trailer

are shown as dashed lines.

The R-12P

™

valve uses the Bendix

R-1

valve family lower

body and standard Bendix mounting brackets. It can also

be reservoir-mounted.

The body and cover are die-cast aluminum, and the valve’s

weight is approximately 2.3 lbs. Porting is as follows:

Qty. Size

Supply (SUP) 2 1/2”

Delivery (DEL) 4 3/8”

Control (CON) 1 1/4”

Exhaust (EXH) 1 --

Bendix

R-12P

™

Pilot Relay Valve

3/8”

DELIVERY

1/2” SUPPLY (2)

RESERVE

SPRING

1/4” CONTROL

LOAD

PISTON

BODY

EQUALIZING

ORIFICE

EXHAUST

INLET/EXHAUST

VALVE

COVER

1/2”

SUPPLY

3/8” DELIVERY (4)

RELAY

PISTON

1/4” CONTROL

1 2 3 4 5 6 7 8

Sommario

Pagina 1 - Pilot Relay Valve

1®SD-03-1063FIGURE 1 - CUTAWAY AND EXTERNAL VIEWDESCRIPTIONThe Bendix® R-12P™ pilot relay valve is designed to speed up control signal application and

Pagina 2 - PILOT RELAY VALVE

2FIGURE 2 - TYPICAL R-12P™ PILOT RELAY VALVE SYSTEM SCHEMATICDELIVERYSPRING BRAKE VALVESUPPLYSERVICE RELAY VALVEQUICK RELEASE VALVEVENTED CUT-OUT COCK

Pagina 3 - NORMAL (RAPID) APPLICATION

3FIGURE 4 - NORMAL (RAPID) APPLICATIONLOAD PISTONINLET/EXHAUST VALVECONTROL PORTFIGURE 5 - BALANCEFIGURE 3 - CHARGINGDELIVERY PORTSUPPLY PORTNORMAL (R

Pagina 4 - EQUALIZING (SLOW) APPLICATION

4FIGURE 6 - RAPID EXHAUST FIGURE 7 - EQUALIZING (SLOW) APPLICATIONFIGURE 8 - EQUALIZING (SLOW) EXHAUSTLOAD PISTONINLET/EXHAUST VALVECONTROL PORTDELIVE

Pagina 5 - PREVENTIVE MAINTENANCE

5FIGURE 9 - REDUCTION OF SUPPLY PRESSURELOAD PISTONINLET/EXHAUST VALVECONTROL PORTDELIVERY PORTSUPPLY PORTRELAY PISTONRESERVE SPRING SEALS EXHAUSTEQUA

Pagina 6 - INSTALLATION

6NOTE: If a supply line single check valve is present (see Figure 2), check it for leakage. Disconnect the inlet side of the single check valve and c

Pagina 7 - CLEANING & INSPECTION

7FIGURE 10 - EXPLODED VIEW19823LOAD PISTON41051112FASTENERRELAY PISTON7BODYCOVERRESERVE SPRING6DISASSEMBLYThe following procedure is for referenc

Pagina 8 - ASSEMBLY