BENDIX BW1624 Manuale Utente Scaricare il pdf (Pagina 3)

SERVICE BRAKES HOLDING — TRACTOR/

TRAILER COMBINATION

The air pressure being delivered to the brake actuators is

also present beneath the relay piston.

When the air pressure above and below relay piston is

equal, the piston moves slightly allowing the inlet valve to

return to its seat. The exhaust valve remains closed. With

both the inlet and exhaust valves closed, air pressure in

the brake actuators is held stable and neither increases

nor decreases. (See Figure 5.)

RELAY

PISTON

INLET-

EXHAUST

VALVE

INLET-EXHAUST

PISTON

PROP

PISTON

RELAY

PISTON

INLET-

EXHAUST

VALVE

INLET-EXHAUST

PISTON

PROP

PISTON

SERVICE APPLICATION BOBTAIL TRACTOR

When the trailer supply valve (dash control with red octago-

nal button) is activated to disconnect the trailer, air in the

BP-R1

™

valve control port and trailer supply line is exhaust-

ed to atmosphere. During bobtail tractor operation, service

application air enters the BP-R1

™

valve service port

causing the exhaust diaphragm to seal the exhaust port.

Service application air passing through the blend back

piston exerts a force on the full effective diameter of

the piston. The blend back piston remains stationary at

application pressures below approximately 80 psi because

of opposing reservoir air acting on the large diameter.

Application air ﬂ owing through the blend back piston also

exerts a force on the small diameter of the proportioning

piston while simultaneously ﬂ owing through the center of

it on its way to the inlet and exhaust valve. Once past the

inlet and exhaust valve, service air pressure exerts a force

on the larger diameter end of the proportioning piston,

which opposes the air pressure and spring force exerted

on the other end. The proportioning piston inlet valve

remains open until a preset, initial application pressure

has reached the relay piston assuring that the founda-

tion brake shoes are brought into contact with the drum.

As service pressure begins to exceed the preset initial

application, the proportioning piston will move sufﬁ ciently

to close its inlet valve without opening the exhaust.

SERVICE BRAKES RELEASING — TRACTOR/

TRAILER COMBINATION

When the brake application is released, air pressure in the

service port of the BP-R1

™

valve returns to the foot brake

valve and is exhausted. Air from above the relay piston ﬂ ows

back through the proportioning, blend back and service

pistons to the exhaust diaphragm. If the service brakes are

rapidly released, the diaphragm ﬂ exes in response to the

returning air and opens the exhaust.

If the brakes are slowly released, service air pressure will

ﬂ ow through the slot behind the diaphragm and back to

the brake valve. As air pressure is reduced above the relay

piston, pressure beneath it lifts the piston away from the

exhaust valve and opens the exhaust passage. Air from

the service brake actuators returns to the BP-R1

™

valve

and ﬂ ows out the open exhaust. (See Figure 6.)

FIGURE 6 - BP-R1

™

RELEASING - TRACTOR/TRAILER

COMBINATION

FIGURE 5 - BP-R1

™

HOLDING - TRACTOR/TRAILER

COMBINATION

1 2 3 4 5 6 7 8 ... 11 12

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BENDIX BW1624 Manuale Utente Pagina 3

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BENDIX BW1624 Manuale Utente Pagina 3

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