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Bendix
TW-12
LEVER CAM
MOUNTING
HOLE (2)
FOLLOWER
1/8" P.T.
RETURN
1/4" P.T. SUPPLY
PORT
TM
FIGURE 1- TW-12
CONTROL VALVE
DESCRIPTION
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The TW-12
control valve is a manually operated, non-
graduating, on-off valve. It is extensively used in hydraulic
braking systems to control devices that are responsible for
the application and release of the parking brakes.
Note: The TW-12
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used in air brake system applications.
The most common configuration of the TW-12
uses a levered cam that is manually, remote controlled. A
dash mounted lever or button may be connected to the
aluminum lever cam via Bowden cable control or connected
directly to the transmission selector.
Two .28 inch mounting holes are provided in the die cast
zinc body for panel or frame mounting. Two steel hex cap
nuts at the ends of the cylindrical valve body retain the internal
components and provide attachment for the lever cam. All
connection ports are pipe threads. Lettering embossed in
the valve body identifies two of the three ports in the valve.
Refer to the following chart and figure one.
Control Valve
LEVER
CAM
PIVOT
LEVER
YOKE
CAM
PORT
SUPPLY PORT
CAP NUT
control valve can also be
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control valve
LEVER
PIVOT
LEVER
YOKE
CAP
NUT
1/4" P.T.
DELIVERY
PISTON O-RING
PORT
RETURN PORT
PISTON RETURN
PASSAGE
INLET VALVE
CAP NUT O-RING
Connection
Supply
Delivery
Vent
OPERATION
SYSTEM CONNECTIONS
Although the TW-12
systems and connected in different ways, figure 2 illustrates
a typical hydraulic parking brake system. In this system
the TW-12
turn applies and releases hydraulic spring brakes.
VALVE OPERATION
Parking Brakes Applied
With hydraulic fluid flowing to the supply port (Figure 1) and
the piston in the upward position, fluid flow into the TW-12
control valve is stopped at the closed inlet valve.
INLET VALVE SPRING
SUPPLY PORT
Body Ident. Thread
SUP
DEL
NONE
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valve can be used in a variety of different
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valve controls an HR-1
CONTROL
CABLE
CONNECTION
LEVER CAM
PLUNGER
PISTON
PISTON RETURN
SPRING
DELIVERY PORT
Sizex
1/4" P.T.
xx
1/4" P.T.
xx
1/8" P.T.
xx
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hydraulic relay that in
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1