AAK Hydraulic Cartridge Counterbalance Valve No Internal Leakage

Consuelo is from a hydraulic equipment manufacturing company in Spain, and has
been engaged in procurement for less than 3 years. At the beginning of last
year, their excavator was complained. After checking, it was judged that the
hydraulic cartridge counterbalance valve was leaking, and the valve spool was
worn. According to the feedback from the original hydraulic cartridge
counterbalance valve manufacturer, the valve spool is made of 12L14 free-
cutting steel, which is commonly used in the industry. The only solution is to
replace the hydraulic cartridge counterbalance valve with new ones, which means
that the valves will need to be replaced every 8 months. Consuelo knew that his
boss and customer would not be satisfied. He tried to find a new manufacturer
of hydraulic cartridge counterbalance valve, but failed.

Consuelo found AAK on Google, and noticed that AAK had introduced some customer
cases about the difficult and complicated problems of the hydraulic cartridge
counterbalance valve, and sent an email asking: Can AAK hydraulic cartridge
counterbalance valve achieve no internal leakage and be durable for more than 1
year? After communication, we learned that the hydraulic cartridge
counterbalance valve produced by the original cartridge valve manufacturer had
internal leakage after being used for about 8 months. According to the
schematic diagram of the hydraulic system provided by Consuelo, combined with
the working conditions of the excavator, AAK engineers found that it was not
only the problem of changing the material of the valve spool, but also the
problem of optimizing the structure of the original hydraulic cartridge
counterbalance valve. After 40 days, AAK sent 6 samples of hydraulic cartridge
counterbalance valve.

Last week, Consuelo said that he would purchase 120 hydraulic cartridge
counterbalance valves to replace the ones currently used on the excavators. The
excavators installed with AAK hydraulic cartridge counterbalance valve have
been used for 10 months, and there is no complaint of leakage. AAK improved the
original hydraulic cartridge counterbalance valve from the 3 aspects:

1. Change in material selection. AAK hydraulic cartridge counterbalance valve
spool is made of 20CrNi2MoV high carburized bearing steel, which is more
suitable. We never consider the general standard of the industry, but what
material is most suitable for the working condition.

2. The change of the seal, the inner cone of the check valve spool and the
lower end face of the valve seat form a line seal, the outer cone of the
control valve spool and the through hole on the valve seat form a line seal,
and the lower through hole section of the relief valve spool and the valve seat
form a line seal. Three lines are sealed to ensure no leakage.

3. With the change of valve operation, the overflow valve spool slides to
control the on-off of the oil outlet and the oil return port, with the help of
the coordination of the control valve spool and the valve seat. Whether the
load rises or falls, the check valve spool is opened and closed from twice to
once, and the valve spool life is doubled.

AAK hydraulic cartridge counterbalance valve, has no internal leakage and is
durable. You can also try it!

https://www.aakindustry.com/info-detail , /cartridge-counterbalance-valves-aak505

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