BENDIX E-6 Manual - Page 2

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FIGURE 3 - E-6

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DUAL BRAKE VALVE SECTIONAL

DIAGRAM

APPLYING: NORMAL OPERATION -

SECONDARY CIRCUIT

When the primary inlet valve is moved off its seat, air is

permitted to pass through the bleed passage and enters the

relay piston cavity. The air pressure moves the relay piston,

which contains the exhaust seat and closes the secondary

exhaust valve. As the secondary exhaust valve closes, the

secondary inlet valve is moved off its seat allowing the

secondary air to flow out the secondary delivery port.

Because of the small volume of air required to move the

relay piston, action of the secondary circuit of the valve is

almost simultaneous with the primary circuit portion.

APPLYING: LOSS OF AIR IN THE SECONDARY

CIRCUIT

Should air be lost in the secondary circuit, the primary

circuit will continue to function as described above under

Normal Operation: Primary Circuit Portion.

APPLYING: LOSS OF AIR IN THE PRIMARY

CIRCUIT

Should air be lost in the primary circuit, the function will be

as follows: As the brake treadle is depressed and no air

pressure is present in the primary circuit supply and

FIGURE 4 - E-10

DIAGRAM

delivery ports, the primary piston will mechanically move

the relay piston, allowing the piston to close the secondary

exhaust valve and open the secondary inlet valve and allow

air to flow out the secondary delivery port.

BALANCED: PRIMARY CIRCUIT

When the primary delivery pressure acting on the piston

equals the mechanical force of the brake pedal application,

the primary piston will move and the primary inlet valve will

close, stopping further flow of air from the primary supply

line through the valve. The exhaust valve remains closed

preventing any escape of air through the exhaust port.

BALANCED: SECONDARY CIRCUIT

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 from the

supply line through the valve. The exhaust remains closed

as the secondary delivery pressure balances the primary

delivery pressure.

When applications in the graduating range are made, a

balanced position in the primary circuit is reached as the air

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DUAL BRAKE VALVE SECTIONAL