AAK Hydraulic Cartridge Counterbalance Valve Save Energy by 20% more

Mablevi is from South Africa, and has purchased hydraulic cartridge valves from
AAK for 2 years. They are all standard parts of SUN or HyraForce models. The
order frequency is high, but the quantity is small. Sometimes 10 pieces are
purchased for one style, and sometimes 1 piece is purchased, but AAK has never
disliked them. Last week, I received the annual order of 1,000 hydraulic
cartridge counterbalance valves from Mablevi, which was unexpected and
surprising.

At the beginning of last year, their dealers reported that the energy
consumption of the excavators they supplied was high. In order to increase the
market share, the energy consumption must be reduced. Their engineers optimized
the whole hydraulic system and put forward new requirements for the hydraulic
cartridge counterbalance valve with energy recovery function. According to the
feedback of the original cartridge valve manufacturer, this is the model same
as SUN hydraulic cartridge counterbalance valve, which does not have energy
recovery function. Mablevi checked with SUN and got the reply that this
function is not available, but it can be customized. It requires a high MOQ and
high development cost. Mablevi was in trouble.

Mablevi thought of AAK and asked: Can AAK customize the hydraulic cartridge
counterbalance valve with "energy recovery" function? It is the first time that
I received such functional requirement from customer. After communication, I
learned that they encountered difficulties in purchasing this hydraulic
cartridge counterbalance valve. According to their equipment hydraulic system
principle, in the process of load reduction and braking, the mechanical energy
of the load is fully converted into internal energy through the throttling of
the hydraulic cartridge counterbalance valve to achieve the smooth load
reduction and braking, which leads to energy waste. Can we make use of this
energy? This is our thinking direction. After 45 days, AAK sent 48 samples of
hydraulic cartridge counterbalance valves.

3 weeks after the samples of the hydraulic cartridge counterbalance valve were
sent, Mablevi informed me by email that the excavator could work after be
installed with AAK hydraulic cartridge counterbalance valve. Their internal
test showed that the energy consumption fell by about 20%. It needs to wait the
specific feedback from the market. He asked me to wait patiently for the annual
order of this hydraulic cartridge counterbalance valve.

AAK hydraulic cartridge counterbalance valve can realize the stable load, and
the mechanical energy of the load can be converted into pressure oil through
the oil recovery hole to realize the energy recovery function when lowering or
braking. The key lies in 3 unique structures:

1. The throttling chamber of AAK hydraulic cartridge counterbalance valve is
divided into pressure oil chamber, return oil chamber, two oil drain chambers
and control oil chamber. The control oil chamber is connected with the control
oil port through the throttle, the pressure oil chamber is connected with the
pressure oil port, and the two oil drain chambers are connected with the oil
drain port.

2. AAK hydraulic cartridge counterbalance valve is also equipped with a three-
way pressure compensation chamber with 4 holes (oil inlet hole, recovery oil
hole, working oil hole, and control oil hole). The oil inlet hole is connected
with the oil return cavity, the oil inlet hole is connected with the oil drain
cavity, the control oil hole is connected with the pressure cavity, the
recovery oil hole, and the working oil hole is connected with their oil ports.

3. The compensation valve spool and balance spring are installed in the
compensation valve chamber. When the compensation valve spool acts, open the
recovery oil hole first, and then open the working oil hole. The pressure of
the oil inlet hole and the balance spring control the opening of the oil
receiving hole and the working oil hole, control the pressure of the oil hole,
and control the closing of the oil receiving hole and the working oil hole.

AAK hydraulic cartridge counterbalance valve, has 1 more function than SUN
standard part, and reduces energy consumption by 20%. You can also try it!

https://www.aakindustry.com/info-detail , /cartridge-counterbalance-valves-aak522

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