AAK hydraulic relief valve has no scream, Petrov admired

Petrov is an old purchaser of Hydrosila Group in Russia. He cooperates with AAK
on some non-standard hydraulic pilot operated relief valves and often discusses
some difficulties and complications of hydraulic pilot operated relief valves.
In the second half of last year, they needed to purchase a hydraulic pilot
operated relief valve to test an agricultural machinery equipment. Due to
urgent time, Petrov purchased from a Russian hydraulic relief valve
manufacturer, who delivered 30 hydraulic pilot operated relief valves in 30
days. During the test run, the hydraulic pilot operated relief valves screamed
at about 1.5MPa before opening, as well as at the start and stop. Petrov
contacted the manufacturer of the hydraulic relief valves, and the manufacturer
replied that the non-standard customization was completely based on the
drawings provided, and the dimensional accuracy also met the requirements.
Their engineers independently tested the hydraulic relief valves and found that
there was really no abnormality. The boss was dissatisfied with the one week of
delay due to the test run and asked Petrov to repurchase the hydraulic pilot
operated relief valves.

Because the hydraulic relief valve problems encountered before were solved by
AAK, Petrov emailed me again. AAK engineer preliminarily judged that there may
be problems in the design of the hydraulic pilot operated relief valve
according to his fault description, the drawings of the pilot operated relief
valve, the working parameters of the hydraulic system of agricultural
machinery, and the video of the test machine. Knowing that he still has one
month of flexibility, AAK can modify the original design of the hydraulic pilot
operated relief valve and send 12 samples within 30 days. Four weeks later, AAK
sent 20 samples of hydraulic pilot operated relief valves, which were installed
and debugged without screaming, and the hydraulic power unit was started or
closed for many times still without screaming.

Petrov was surprised that AAK engineer found and solved the problem of
hydraulic relief valveS at one time, while the original Russian hydraulic
relief valve manufacturer can do nothing?

Because the scream of pilot operated relief valve is often generated by high-
pressure oil through damping hole or valve port, AAK engineer added inclined
hole of valve seat and vibration elimination cavity in the original design. In
this way, the dynamic and static characteristics of the hydraulic pilot
operated relief valve can be improved, the screaming can be eliminated, the
noise can be reduced, and the pressure control accuracy can be improved at the
same time. AAK strong engineering team not only has the concept of German HAWE,
but also has the experience of Italian Oil Control，the problem can be found at
one time.

After the successful test run, Petrov privately told us that the boss was very
satisfied that he found a strong manufacturer of hydraulic relief valves this
time, which not only solved the problems that the original Russian manufacturer
could not solve, but also made the price 30% cheaper. AAK will be his first
choice for the test order of hydraulic relief valves in the future.

AAK hydraulic relief valves, super technical team, you can also have a small
try!

https://www.aakindustry.com/info-d , etail/hydraulic-pilot-operated-relief-valves-
a , ak211

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