User Manual

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Bendix

E-8P

™

& E-10P

™

Dual Brake Valves

DESCRIPTION

Refer to Figures 4, 5 and 6 for item numbers referenced

in parenthesis.

The Bendix

E-8P

™

(Figure 1) and E-10P

™

(Figure 2)

dual brake valves are ﬂ oor mounted, treadle operated

type brake valves with two separate supply and delivery

circuits for service (primary and secondary) braking, which

provides the driver with a graduated control for applying and

releasing the vehicle brakes.

The E-10P

™

dual brake valve (Figure 2) is similar to the

E-8P

™

dual brake valve except that a metal coil spring

(5) housed in an upper body assembly replaces the

rubber spring (27) used in the E-8P

™

valve. The use

of a metal coil spring (and the upper body assem-

bly) provides greater treadle travel and, therefore,

provides the driver with a less sensitive “feel” when

making a brake application. The E-10P

™

dual brake

valve is generally used on buses, where smooth brake

applications contribute to passenger comfort.

The circuits in the E-8P

™

/E-10P

™

dual brake valves are

identiﬁ ed as follows: The No. 1 or primary circuit is that

portion of the valve between the spring seat which contacts

the plunger and the relay piston; the No. 2 or secondary

circuit is that portion between the relay piston and the

exhaust cavity.

The primary circuit of the valve is similar in operation to a

standard single circuit air brake valve and under normal

operating conditions the secondary circuit is similar in

operation to a relay valve.

Both primary and secondary circuits of the brake valve use

a common exhaust protected by an exhaust diaphragm.

FIGURE 1 - E-8P

™

DUAL BRAKE VALVE

FIGURE 2 - E-10P

™

DUAL BRAKE VALVE

VALVE

MOUNTING

PLATE

TREADLE

SUPPLY

DELIVERY

(4)

AUXILIARY

SUPPLY

VALVE

MOUNTING

PLATE

TREADLE

DELIVERY

(4)

SUPPLY

(4)

EXHAUST

SD-03-830

Summary of content (8 pages)

PAGE 1
SD-03-830 Bendix® E-8P™ & E-10P™ Dual Brake Valves TREADLE TREADLE MOUNTING PLATE MOUNTING PLATE VALVE SUPPLY (4) SUPPLY DELIVERY (4) DELIVERY (4) VALVE AUXILIARY EXHAUST SUPPLY FIGURE 1 - E-8P™ DUAL BRAKE VALVE EXHAUST FIGURE 2 - E-10P™ DUAL BRAKE VALVE DESCRIPTION Refer to Figures 4, 5 and 6 for item numbers referenced in parenthesis. valve is generally used on buses, where smooth brake applications contribute to passenger comfort.
PAGE 2
MV-3™ MANIFOLD VALVE TP-5™ TRACTOR PROTECTION VALVE TRAILER CONTROL VALVE SLACK ADJUSTER BRAKE CHAMBER SLACK ADJUSTER (E-8P™ OR E-10P™) DUAL BRAKE VALVE GOVERNOR SPRING BRAKES QUICK RELEASE VALVE DOUBLE CHECK VALVE BP-R1™ BOBTAIL PROPORTIONING VALVE AIR DRYER SUPPLY RESERVOIR (WET TANK) COMPRESSOR #1 SERVICE RESERVOIR #2 SERVICE RESERVOIR FIGURE 3 - TYPICAL PIPING SCHEMATIC 18 16 19 15 25 26 27 28 22 23 UPPER BODY 33 DEL - 1 24 17 31 SUP - 1 20 21 30 14 LOWER BODY 32 SUP - 2
PAGE 3
OPERATION - Refer to Figure 3 BALANCED: NO. 2 OR SECONDARY CIRCUIT APPLYING: NORMAL OPERATION - NO. 1 OR PRIMARY CIRCUIT PORTION When the air pressure on the delivery side of the relay piston (20) approaches that being delivered on the primary side of the relay piston, the relay piston moves closing the secondary inlet valve and stopping further flow of air from the supply line through the valve. The exhaust remains closed as the secondary delivery pressure balances the primary delivery pressure.
PAGE 4
Every 3 months, 25,000 miles, or 900 operating hours: Clean any accumulated dirt, gravel, or foreign material away from the heel of the treadle, plunger boot, and mounting plate. Lubricate the treadle roller, roller pin, and hinge pin, with Barium grease per BW-204-M (Bendix part 246671). Check the rubber plunger boot for cracks, holes, or deterioration and replace if necessary. Also, check mounting plate and treadle for integrity.
PAGE 5
bw bw FIGURE 5 - E-8P™ DUAL BRAKE VALVE - EXPLODED VIEW FIGURE 6 - E-10P™ DUAL BRAKE VALVE - EXPLODED VIEW 5
PAGE 6
11. Remove the relay piston (20), relay piston spring (21), primary piston (E-8P™ valve: 22, E-10P™ valve: 2) and primary piston return spring (E-8P™ valve: 23, E-10P™ valve: 6) from the upper body. Use care so as not to nick seats. 12. A small washer (24) will be found in the cavity of the lower side of the primary piston (for E-8P™ valve: 22, for E-10P™ valve: 2). 6.
PAGE 7
VALVE INSTALLATION 1. Install the assembled brake valve on the vehicle. 2. Reconnect all air lines to the valve using the identification made during VALVE REMOVAL step 1. 3. After installing the brake valve assembly, perform the “OPERATION AND LEAKAGE CHECKS” before placing the vehicle in service.