1
DESCRIPTION
The TC-2
™
brake valve is a hand operated control valve
which features a graduated control of air pressure. The
most common application is the control of trailer brakes
independent of tractor brakes; however, the valve may be
remotely operated type valve is connected to the operating
handle by a linkage rod.
The TC-2
™
brake valve is not intended for use as a parking
control valve and should not be used for that purpose.
OPERATION
APPLYING
When the handle or actuating lever is moved in a clockwise
direction from the released position, force is exerted on the
pressure graduating spring through the action of the cam
and cam follower. The force of the spring on the piston
causes it to move down.
The exhaust seat, which is in the center of the piston,
contacts the exhaust valve and closes the exhaust passage
in the piston. The continued downward movement of the
piston moves the inlet valve off its seat. Reservoir air
pressure fl ows by the open inlet valve and out the delivery
port.
SD-03-813
Bendix
®
TC-2
™
Trailer Control Brake Valve
HOLDING
The air pressure that fl ows by the open inlet valve also
becomes effective on the bottom area of the piston. As
the force of the air pressure beneath the piston balances
the force of the depressed graduating spring above, the
piston lifts slightly and the inlet valve returns to its seat. The
exhaust valve remains seated so the fl ow of air through
the valve is stopped and air pressure in the service line
is held.
FIGURE 1 TC-2
™
TRAILER CONTROL BRAKE VALVE TYPICAL PIPING DIAGRAM
TC-2
™
BRAKE
VALVE
CONTROL VALVE
RESERVOIR
BRAKE
VALVE
COMBINATION STOP LIGHT SWITCH
AND DOUBLE CHECK VALVE
TRACTOR
PROTECTION
VALVE
EMERGENCY HOSE
SERVICE HOSE
FIGURE 2 EXTERIOR VIEW
