Bendix Commercial Vehicle Systems TW-N TWO WAY CONTROL VALVE - Manual

1
®
SD-03-3672
Bendix ® TW-N ™ Two Way Control Valve
FIGURE 1
DESCRIPTION
The TW-N ™ valve is a manually operated two position control
valve. It is normally dash or panel mounted and incorporates
a manually operated control lever. The TW-N
™ valve was
designed for use as a control for non-modulating air system
devices.
With the exception of the plunger return spring, lever pin
and lever reinforcement the TW-N
™ valve is constructed of
nonmetallic material.
The single supply port and delivery port are both tapped with
a 1/8" female pipe thread to accommodate air connections.
A single .26" (6.6 mm) O.D., unthreaded exhaust nipple is
located on the side and midway down the valve body. Each
port is identified with embossed letters; SUP for supply,
DEL for delivery and EXH for the exhaust.
The TW-N ™ valve is generally mounted using two of the four
mounting holes that are provided. All four mounting holes
are tapped with a 10-24 thread.
The TW-N ™ valve is interchangeable with the TW-1 ™ two-way
control valve with respect to vehicle fit and function. Dial
plates and attaching screws can be used interchangeably
on either the TW-N
™ and TW-1 ™ valves, however other detail
components are not interchangeable.
OPERATION
With the TW-N ™ valve in the exhaust position, air at the
supply port is prevented from flowing to the delivery port by
the lower o-ring on the plunger. (Figure 2) When the lever is
moved to the delivery position, (Figure 3) the return spring
and air pressure moves the plunger allowing the lower plunger
o-ring to slide past the delivery port passage. With the plunger
in this position (Figure 3), air flows from the supply port and
out the delivery port.
DELIVERY
PORT
1/8” P.T.
MOUNTING
HOLE (4)
SUPPLY
PORT
1/8” P.T.
EXHAUST
.26” O.D.
(6.6 MM)
LEVER
LEVER PIN
DELIVERY
PORT
SUPPLY
PORT
SPRING
O-RING (SMALL)
BODY
O-RING (LARGE)
PLUNGER