BENDIX BW2491 Manuel D’Utilisation

®

The Bendix

®

 TCS-9000

™

 control brake valve is normally used

to operate the trailer brakes independently of the tractor
brakes. It may be used, however, wherever a hand controlled
pressure graduation function is desired.

The TCS-9000

™

 valve is handle operated and is designed for

dash or panel mounting.  It is not designed for use as a
parking brake control and should never be used to hold the
brakes applied when the operator leaves the vehicle.

When the handle is pulled through its 55° arc, the cam is
rotated accordingly. The cam action forces the cam follower
downward, compressing the graduation spring and creating
a force on the plunger which depresses the inlet valve and
delivers air under pressure to the delivery port.

As delivery pressure builds up in the delivery port, it is also
effective under the plunger causing it to balance the force of
the graduation spring until the inlet valve is seated against
its seat in the body and is also seated against the plunger,
thus preventing the delivery air from exhausting through the
center of the plunger, maintaining the desired pressure in
the delivery line.

When the handle is released or moved to its release position,
the cam follower is permitted to rise, opening the exhaust
passage and allowing the air pressure in the delivery line to
exhaust out the exhaust port.

HANDLE

GRADUATION

SPRING

PLUNGER

INLET VALVE

EXHAUST

DELIVERY

SUPPLY

CAM

FOLLOWER

CAM

HORIZONTAL PORTS

1/4" PTC

EXHAUST

3/8" PTC

DELIVERY

3/8" PTC

SUPPLY