AAK Hydraulic Cartridge Counterbalance Valve with Variable Pilot Ratio

Romeo is from Argentina. At the beginning of this year, their customer
customized a set of personalized hydraulic lifting equipment. The test run of
the equipment was smooth. After the trial, the customer reported that the
energy consumption of the equipment was a little high. After the inspection,
the engineer found that the throttling loss of the hydraulic cartridge
counterbalance valve is large when the load is low and the flow is large, which
is the source of high energy consumption. They requested the manufacturer to
optimize the hydraulic cartridge counterbalance valve. The manufacturer tried
for 4 weeks but no result. Romeo contacted some other hydraulic cartridge valve
manufacturers, but there was still no good plan. The customer had been pushing
for update, Romeo had no idea yet and was very worried.

Romeo found me through the introduction of Patrick, an old customer of AAK.
According to the situation described by Romeo, AAK technical team pondered the
original hydraulic cartridge counterbalance valve drawing and system schematic
diagram, 2 days later, the preliminary plan was formed. After 50 days, AAK sent
12 hydraulic cartridge counterbalance valve samples.

Last week, Romeo emailed us to inform that after AAK hydraulic cartridge
counterbalance valve was installed in the equipment, the throttling was
improved under low load and large flow. The energy consumption was 20% lower
than before, the customer was very satisfied. Their engineers were surprised
that AAK technical team optimized the original hydraulic cartridge
counterbalance valve from these 3 aspects, and added a new function, namely,
variable pilot ratio. The hydraulic cartridge counterbalance valve with
variable pilot ratio has a special structure.

1. The optimized hydraulic cartridge counterbalance valve body is provided with
a control oil port. The two ends of the control piston include the first acting
surface and the second acting surface. The valve cage is provided with a first
chamber which is close to the first acting surface.

2. The control piston is provided with an annular boss which is close to the
end face of one side of the first chamber. One end of the valve spool is
against the second acting surface, and the end cover is connected with the
control piston in a sliding seal.

3. The end cover is also provided with an annular boss to form an annular
groove of the sliding seal and a connecting oil passage, and the annular groove
is close to the end face of one side of the first chamber. The second chamber
is formed between the two working surfaces of the piston, which can easily
realize the function of controlling the piston.

The optimized hydraulic cartridge counterbalance valve has the characteristics
of variable pilot ratio and pilot pressure while the load moves stably. The
performance of low pilot ratio and high pilot ratio can be realized according
to different working conditions. The pilot pressure of the hydraulic cartridge
counterbalance valve can be reduced by 20%, which is the highlight of 20%
energy saving.

AAK hydraulic cartridge counterbalance valve, with variable pilot ratio and
pilot pressure, you can also have a small trial!

https://www.aakindustry.com/info-det , ail/counterbalance-valves-aak445

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