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SD-03-818

Bendix

E-7

™

Dual Brake Valve

The primary circuit portion of the valve is similar in oper-

ation to a standard single-circuit air brake valve, and under

normal operating conditions the secondary circuit portion

is similar in operation to a relay valve.

The primary circuit portion of the valve is part of a re-

movable cage which also houses the relay piston and the

cage which can be removed without removing the entire

brake valve.

Both primary and secondary circuit portions of the E-7

™

dual brake valve use a common exhaust protected by an

exhaust check valve.

DESCRIPTION

The Bendix

E-7

™

dual brake valve is a suspended,

pedal-operated type brake valve with two separate supply

and delivery circuits for service and emergency braking,

which provides the driver with a graduated control for

applying and re leasing the vehicle brakes.

The circuits in the E-7

™

dual brake valve are identiﬁ ed as

follows: The primary circuit portion is that portion of the

valve between the spring seat which contacts the plunger

and the relay piston; the secondary circuit portion is that

portion between the relay piston and the exhaust cavity.

SECONDARY

DELIVERY

PRIMARY

DELIVERY

PRIMARY

SUPPLY

SECONDARY

SUPPLY

MOUNTING

PLATE

FIGURE 1 - E-7

™

DUAL BRAKE VALVE

SECONDARY

DELIVERY

SECONDARY

DELIVERY

PRIMARY

DELIVERY

PRIMARY

SUPPLY

SECONDARY

SUPPLY

Summary of content (8 pages)

PAGE 1
SD-03-818 Bendix® E-7™ Dual Brake Valve MOUNTING PLATE SECONDARY DELIVERY SECONDARY SUPPLY SECONDARY SUPPLY SECONDARY DELIVERY SECONDARY DELIVERY PRIMARY SUPPLY PRIMARY DELIVERY PRIMARY DELIVERY PRIMARY SUPPLY FIGURE 1 - E-7™ DUAL BRAKE VALVE DESCRIPTION The Bendix® E-7™ dual brake valve is a suspended, pedal-operated type brake valve with two separate supply and delivery circuits for service and emergency braking, which provides the driver with a graduated control for applying and releasing the v
PAGE 2
OPERATION BALANCED: SECONDARY CIRCUIT PORTION APPLYING: NORMAL OPERATION - PRIMARY CIRCUIT PORTION When the air pressure on the secondary side of the relay piston 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 pressure from the supply line through the valve. The exhaust remains closed as the pressures balance.
PAGE 3
INLET-EXHAUST ASSEMBLY (1) EXHAUST CHECK VALVE RETAINER (17) SCREW (21) O-RING (2) WASHER (22) O-RING (3) DIAPHRAGM (13) RELAY SPRING (5) RETAINER (20) INLET-EXHAUST ASSEMBLY (4) O-RING (11) O-RING (9) O-RING (7) O-RING (6) O-RING (12) PISTON SPRING (8) SPRING SEAT NUT (16) RETAINER (18) STEM SPRING (23) RUBBER SPRING (10) SPRING SEAT (15) RUBBER SPRING SEAT (19) LOCK NUT (14) STOP BUTTON PLUNGER ROLLER FULCRUM PIN PEDAL SEALING RINGS MANIFOLD* *OPTIONAL MANIFOLD FOR INSTALLATIONS R
PAGE 4
PLUNGER MOUNTING PLATE PLUNGER COTTER PIN COTTER PIN FULCRUM PININSTALLED IN THE DIRECTION OF THE PEDAL PAD FULCRUM PIN INSTALLED IN THE DIRECTION OF THE PEDAL PAD PEDAL OFFSET ROLLERS BRAKE PEDAL PAD PEDAL OFFSET FIGURE 3 - E-7™ BRAKE VALVE ASSEMBLIES WITH OFFSET PEDALS E-7™ valve not meet the elements of the operational tests noted in this document, further investigation and service of the valve may be required.
PAGE 5
When the treadle is fully applied, the reading on the test gauge should fall off to zero promptly when the application is released. It should be noted that the primary circuit delivery pressure will be about 2 psi greater than secondary circuit delivery pressure with primary and secondary circuit supply reservoirs at the same pressure. This is normal in this valve.
PAGE 6
DISASSEMBLY (UPPER STATIC PISTON ASSEMBLY) 1. Remove o-rings (2) and (3). 2. Remove retaining ring (17), and remove secondary circuit inlet exhaust assembly (1). DISASSEMBLY OF LOWER STATIC ASSEMBLY 1. Apply firm pressure on spring seat (19), which will compress piston return spring. Locking groove in piston is now accessible through rectangular opening in lower static piston body. Insert wire or screwdriver into locking groove, thus holding static piston spring in compressed position. 2.
PAGE 7
When the treadle is fully applied, the reading on the test gauge should fall off to zero promptly when the application is released. It should be noted that the primary circuit delivery pressure will be about 2 psi greater than secondary circuit delivery pressure with primary and secondary circuit supply reservoirs at the same pressure. This is normal in this valve. 4.