AAK Hydraulic Cartridge Counterbalance Valve Free of Load Interference

Andreus is from a hydraulic equipment company in Chile. He has been in
purchasing smoothly for 2 years. At the beginning of the year, their company
received an inquiry for a batch of personalized excavators, and customer needed
prototypes. The hydraulic cartridge counterbalance valve in the hydraulic
system is the key. Their engineer asked Andreus to purchase the standard parts
of SUN hydraulic cartridge counterbalance valves, but the parameters did not
match, and SUN was unwilling to customize. They had to work with a hydraulic
cartridge valve manufacturer who had cooperated with them for 4 years to make
samples. But the test run was not smooth. When the load pressure was applied,
the opening of the main valve spool of the hydraulic cartridge counterbalance
valve would change, affecting the flow and causing the main engine to shake.
The hydraulic cartridge counterbalance valve manufacturer had no solution but
to give up. Andreus contacted more than 10 other hydraulic cartridge valve
manufacturers, but still no result after 1 week. The engineer was impatient,
and Andreus was worried.

Andreus browsed AAK website on Google and clicked the article and product
introduction about hydraulic cartridge counterbalance valves for many times. He
left us a message: How to keep the hydraulic cartridge counterbalance valve
free from load interference and stable flow? I replied: There are many reasons
for the problem, which should be analyzed in details. According to the video of
abnormal equipment sent by him, as well as the production drawings of the
hydraulic cartridge counterbalance valve, AAK engineers judged that the
structure should be optimized and AAK is 90% confident to solve the problem.
Andreus saw the hope and asked for AAK samples. After 50 days, AAK sent 20
hydraulic cartridge counterbalance valve samples.

1 month later, Andreus informed that after the excavator was equipped with AAK
hydraulic cartridge counterbalance valve, the equipment was running stably and
the prototype had been sent to the customer. AAK hydraulic cartridge
counterbalance valve can resist the pressure fluctuation when the load drops,
and the flow is stable. We have made 3 structural optimizations. The hydraulic
cartridge counterbalance valve is composed of 5 parts: valve body, valve seat,
main valve spool, pilot valve spool and pilot mechanism.

1. The valve seat of the hydraulic cartridge counterbalance valve is connected
with the valve body to form a connected first channel, and the extended end of
the valve seat butts against the pilot mechanism to form a second channel.

2. The main valve spool of the hydraulic cartridge counterbalance valve is
provided with a throttling groove, the other end is connected with the inner
cavity of the main valve spool, and the pilot drive part is used to drive the
pilot valve spool.

3. One end of the pilot valve spool of the hydraulic cartridge counterbalance
valve is slidably arranged in the inner chamber of the main valve spool, and
the other end is connected with the pilot mechanism. The pilot valve spool is
also provided with a throttling groove, an axial pilot valve spool chamber and
an orifice.

The optimized balance structure of the hydraulic cartridge counterbalance
valve, which connects the pilot valve spool and the inner chamber of the main
valve spool, enables the oil pressure through the 2 channel ports to form a
balance on the pilot valve spool, and the opening of the main valve spool under
the force of the pilot mechanism can not be affected by the load pressure
fluctuation.

AAK hydraulic cartridge counterbalance valve, no load interference, you can
also try a small order!

https://www.aakindustry.com/info-det , ail/counterbalance-valves-aak456

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