AAK Hydraulic Pressure Control Cartridge Valve 100% Load Holding

Kadin is from Brazil. I know that he has purchased hydraulic cartridge valves
from Ningbo for at least 2 years. The peers joked that his bargain just like
cutting vegetables. But a batch of hydraulic pressure control cartridge valves
made him suffer. The reason may be that the price was too low. In the second
half of last year, they received feedback from customer that the excavator they
sold, the stick and boom will fall a short distance after stop working. Their
engineers judged that the load holding function of the hydraulic pressure
control cartridge valve in the system was abnormal. The original manufacturer
of the hydraulic pressure control cartridge valve said that it is too difficult
to optimize the function due to its price. Kadin contacted other cartridge
valve manufacturers and asked that the load holding function should be 100%
guaranteed, and there was no result after a week. In this way, the original
manufacturer did not care about the function of the hydraulic pressure control
cartridge valve supplied, and the new manufacturers also ignored him. Kadin was
in a hurry.

Kadin sent me an email: Can AAK 100% ensure that the hydraulic pressure control
cartridge valve can maintain its load? After several rounds of communication, I
learned that he had trouble in purchasing hydraulic pressure control cartridge
valves. According to the video of equipment abnormalities complained by his
customer and the production drawings of hydraulic pressure control cartridge
valve, I fed back AAK's plan. Kadin asked for samples. After 45 days, AAK sent
24 samples of hydraulic pressure control cartridge valves.

3 months later, Kadin emailed me that it was nearly 3 months since AAK
hydraulic pressure control cartridge valve was used, the customer did not find
that the stick and boom were falling. His boss planned to replace the original
manufacturer's hydraulic pressure control cartridge valves with AAK’s.

AAK 100% ensures that the hydraulic pressure control cartridge valve has load
holding function, which depends on the structural innovation. During the load
holding process, the conical valve spool and valve sleeve form a conical
sealing structure under the pre-compression force of the return spring. This
can effectively reduce the clearance leakage through the pilot spool spool and
reduce the boom drift.

1. The hydraulic pressure control cartridge valve is equipped with a pilot
sliding cone valve spool and a pilot oil passage. The valve body, valve sleeve
and pilot spool valve spool cooperate with each other to form 6 chambers from
left to right. There is a load oil circuit in the sixth chamber, which is
connected with the fifth chamber through the first orifice and the second
orifice. The fifth chamber is connected with the second chamber with the main
valve body through the oil inlet hole.

2. The main valve body of the hydraulic pressure control cartridge valve has a
one-way valve spool and a one-way valve spool spring chamber. The third chamber
is connected with the spring chamber of the one-way valve spool through the
throttling groove, and the spring chamber is connected with the second oil
drain hole and oil drain passage.

3. The pilot control part provides the hydraulic pressure control cartridge
valve with load holding relief pressure oil through the pilot oil passage, and
the fourth chamber is connected with the oil drain passage through the first
and second oil drain holes. When the load is maintained, a conical sealing
structure is formed between the one-way valve spool and the main valve body.

AAK hydraulic pressure control cartridge valve, 100% load holding function, is
not only safe, you can also try it!

https://www.aakindustry.com/info-detail , /pressure-control-cartridge-valves-
aak523

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