Integrated Accumulator Charging Valve/Pump Package0 pages

Product Bulletin

Integrated Accumulator
Charge Valve/Pump Package

DESCRIPTION

This integrated package features a MICO® Accumulator
Charge Valve and a Haldex W 900 Gear Pump to accomplish the accumulator charge function. The function of a dual
accumulator charge valve is to control the pressure in
redundant accumulators used in two or more brake circuits.
When the pressure in either accumulator decays to the
specified low limit a charge cycle is initiated. The flow rate at
which the accumulators charge is constant throughout the
charging cycle . The charging cycle is complete when the
pressure in both accumulators reaches the specified high
limit. The brake circuits are protected from pressure spikes
at startup by an internal pressure relief valve. Excess flow
from the valve may be used for steering, cooling or implement functions. A relief valve is required for these functions.

BENEFITS

The package offers greater system reliability by reducing
system components. It reduces potential leak points as well
as plumbing and mounting hardware. Additional benefits
include:
zz Energy savings from greater than 90% overall pump
t efficiency across pressure and speed ranges
zz Minimal system transients at the start and end of the
t accumulator charging cycle due to snap like action of the
t control section
zz A switch port for direct mounting of low accumulator
t pressure warning switch
zz Wide range of pump mounting and shaft configurations
tavailable

SPECIFICATIONS

Pump displacement................. 6.0 to 28 cc/rev. (0.37 to 1.7 in3/rev.)
Maximum pressure.......................... 207 bar (3000 PSI) continuous
t
(higher pressure optional)
Speed................................................................... 500 to 4000 RPM
Pump rotation................................... clockwise or counterclockwise
Pump mounting....................................... SAE A and B 2 bolt flange
t
other options available
Shaft................................................... straight, tapered, spline, tang
t
other options available
Pump inlet port........................ straight thread o-ring boss or flange
Accumulator charge limits........................... custom ranges 193 bar
t
(2800 PSI) maximum upper limit
Accumulator charge rate....................................... 1.9 to 19.0 L/min
t
(0.5 to 5.0 GPM) 4 options
Options.................................................... dual or single accumulator

Symbol