Eaton Compressor & Fabrication C-STOV-MC001-E1 - Manual (Page 88)

88 EATON Char-Lynn Steering Catalog C-STOV-MC001-E1 July 2006
Steering System
Components
Brake Valve
Eaton Hydraulics’ load-
sensing brake valve makes
power brakes an economical
and efficient feature on lift
trucks.
While power brakes in lift
trucks can aid productivity,
incorporating them into lift
trucks has traditionally been
expensive. The need for
additional flow meant extra
plumbing, plus the addition
of a dedicated pump or
a high pressure accumulator
for the brake circuit. The
increased system size also
meant extra demand on the
engine, resulting in reduced
fuel economy.
The Eaton brake valve
provides a better solution.
Used in conjunction with
load-sense steering and a
priority valve, it can work
with an existing system. A
dedicated flow source is not
required. It also ensures that
brakes and steering have
priority over the hoist circuit.
Eaton’s new brake valve has
a shuttle in the sensing port
which allows the priority
valve to determine whether
brakes or steering require
higher pressure.
The priority valve then shifts
to provide adequate flow and
pressure for the function
with the greatest needs. An
integral pressure-
compensated flow limiter
provides low flow for brake
modulation. This feature of
the brake valve allows
simultaneous braking and
steering without steering
interruption or pedal kick.
The design of the circuit also
increases efficiency. The
control flow line of the
circuit is connected in
parallel to both the brake
valve and the steering unit.
Thus, brake and steering
pressures are not additive
during simultaneous
operation. The existing
steering pressure is usually
enough to provide full power
braking.
Another feature of the Eaton
brake valve is that it
accommodates dead engine
braking. The valve contains a
large internally cored area
that acts as a reservoir,
providing oil for brake
actuation in the manual
mode. The valve design
allows the volume and
pressure required for manual
braking to be generated
without excessive pedal
force. Thus, the load-sensing
brake valve offers the
benefits of powered brakes
and manual brakes in a
single package, eliminating
the need for an accumulator.
IN
PS
SS
W
T
Features
• No dedicated pressure source (separate pump or
accumulator) required when the Eaton Power Brake
Valve is used
• Reduces plumbing requirements
• Efficient—no parasitic loss
• Self-contained compact package
• Two-stage master cylinder with built-in reservoir
provides dead-engine braking
• Lower input efforts and reduced pedal travel
for braking
• Optional pilot operated check valve
Specifications—Valve
Max. Rated Pressure 205 bar [3000 PSI]
Rated Flow 11 l/min [3.0 GPM]
For more information, contact Eaton Mobile Valves team.