Bendix Commercial Vehicle Systems LQ-2 QUICK RELEASE VALVES 3/04 - Manual

1
®
SD-03-950
Bendix ® LQ-2 ™ Limiting & Quick Release Valve and TW-1 ™ Control Valve
FIGURE 1
LQ-2 ™ LIMITING & QUICK
RELEASE VALVE
FIGURE 2
DESCRIPTION
LQ-2 ™ LIMITING & QUICK RELEASE VALVE
The Bendix ® LQ-2 ™ limiting and quick release valve is a dual
function valve; the valve serves to limit brake applications
and is generally used on the front or steering axle of a vehicle.
The LQ-2 ™ valve is controlled by a TW-1 ™ control valve, (see
Figure 2) which is mounted in the vehicle cab within reach of
the driver. Placing the control valve in the “Slippery Road”
position will reduce front axle service application pressure
by 50%. With the control valve in the “Dry Road” position,
there is no reduction of service application pressure. In
addition, the LQ-2
™ valve serves a quick release function,
releasing air directly from the front axle chambers.
TW-1 ™ CONTROL VALVE
PLUNGER RETURN
SPRING
INLET VALVE
SPRING
EXHAUST
PORT
LEVER
EXHAUST
VALVE
GASKET
INLET
VALVE
PISTON
INLET & EXHAUST
VALVE
STEM
O-RINGS(2)
SPRING
GUIDE
COVER
SEAL RING
DIAL
PLUNGER
SUPPLY PORT
(FROM BRAKE VALVE)
DELIVERY PORT
(TO BRAKE CHAMBER) EXHAUST
PORT
CUT-OUT VALVE
PORT
(FROM
TWO-WAY
VALVE)
DELIVERY PORT (TO
LIMITING AND QUICK
RELEASE VALVE)
INLET PORT
(FROM BRAKE
VALVE)