BENDIX E-10P DUAL BRAKE VALVES Manual - Página 3

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OPERATION

- Refer to Figure 3

APPLYING: NORMAL OPERATION - NO. 1 OR

PRIMARY CIRCUIT PORTION

When the brake treadle is depressed, the plunger exerts

force on the spring seat (26), graduating spring (23), and

primary piston (22). The primary piston, which contains the

exhaust valve seat, closes the primary exhaust valve. As

the exhaust valve closes, the primary inlet valve is moved

off its seat allowing primary air to ﬂ ow out the No. 1 or

primary delivery port.

APPLYING: NORMAL OPERATION - NO. 2 OR

SECONDARY CIRCUIT

When the primary inlet valve (33) 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 (20), which contains the exhaust seat, and closes the

secondary exhaust valve. As the secondary exhaust valve

closes, the inlet valve (13) is moved off its seat allowing the

secondary air to ﬂ ow out the delivery of the same circuit.

Because of the small volume of air required to move the

relay piston (20), action of the secondary circuit of the valve

is almost simultaneous with the primary circuit portion.

APPLYING: LOSS OF AIR IN THE NO. 2 OR

SECONDARY CIRCUIT

Should air be lost in the No. 2 or secondary circuit, the No.

1 or primary circuit will continue to function as described

above under Normal Operation: No. 1 or Primary Circuit

Portion.

APPLYING: LOSS OF AIR IN THE NO. 1 OR

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 delivery

ports, the primary piston (22) will mechanically move the

relay piston (20), allowing the piston to close the second-

ary exhaust valve and open the secondary inlet valve and

allow air to ﬂ ow out the secondary delivery port.

BALANCED: NO. 1 OR PRIMARY CIRCUIT

When the primary delivery pressure acting on the primary

piston (22) equals the mechanical force of the brake pedal

application, the primary piston (22) will move and the

primary inlet valve (33) will close, stopping further ﬂ ow

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: NO. 2 OR SECONDARY CIRCUIT

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 ﬂ ow 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 pressure on the delivery side of the primary piston (22)

equals the effort exerted by the driver's foot on the treadle.

A balanced position in the secondary portion is reached

when air pressure on the secondary side of the relay piston

(20) closely approaches the air pressure on the primary

side of the relay piston.

When the brake treadle is fully depressed, both the primary

and secondary inlet valves remain open and full reservoir

pressure is delivered to the actuators.

RELEASING: NO. 1 OR PRIMARY CIRCUIT

With the brake treadle released, mechanical force is

removed from the spring seat (26), graduating spring (23),

and primary piston (22). Air pressure and spring load moves

the primary piston, opening the primary exhaust valve,

allowing air pressure in the primary delivery line to exhaust

out the exhaust port.

RELEASING: NO. 2 OR SECONDARY CIRCUIT

With the brake treadle released, air is exhausted from the

primary circuit side of the relay piston (20). Air pressure

and spring load move the relay piston, opening the second-

ary exhaust valve, allowing air pressure in the secondary

delivery line to exhaust out the exhaust port.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performing any intrusive maintenance procedures. A

warranty may be voided if intrusive maintenance is

performed during the warranty period.

No two vehicles operate under identical conditions, as

a result, maintenance intervals may vary. Experience is

a valuable guide in determining the best maintenance

interval for air brake system components. At a minimum,

the E-8P

™

or E-10P

™

valve should be inspected every 6

months or 1500 operating hours, whichever comes ﬁ rst,

for proper operation. Should the E-8P

not meet the elements of the operational tests noted in this

document, further investigation and service of the valve

may be required.

Visually check for physical damage to the brake valve such

as broken air lines and broken or missing parts.

™

or E-10P

™

valve