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Date/Time:  7/30/22 7:59 GMT

AAK Hydraulic Relief Valve 3 Major Advantages to Meet 3 High Requirements

I always remember an unusual inquiry email about hydraulic relief valve from
Ellenburger, a Russian customer, at the beginning of this year. The email
subject was "Don't reply if without ability and confidence", he should have
been in trouble at other manufacturers. The content of the email was about
testing 20 hydraulic relief valves, with detailed part processing drawings and
parameter requirements attached. That was a hydraulic relief valve with high
requirements, and the accuracy of valve hole is required to be within 2μM, the
material hardness of the valve spool is HRC68, and the surface of the valve
body is galvanized nickel alloy, which must withstand high pressure of 450bar.
In addition, the durability test of the hydraulic relief valve must pass 2
million times. The requirements in terms of manufacturing quality, function and
performance for this hydraulic relief valve is all clearly indicated.

After more than 3 hours of discussion by AAK engineers, I replied to
Ellenburger that AAK was able to produce this hydraulic relief valve at a
development cost of 2,500 US dollars. After the email was sent, there was no
reply, and I didn't follow up. Because I believe there are few manufacturers
who can make this hydraulic relief valve. For example, in Ningbo, the "hometown
of hydraulic valves in China", perhaps only 3 factories have this technical

3 months later, Ellenburger suddenly asked our bank account number. He wanted
to pay us to sample the hydraulic relief valve. I was also a little confused.
After several rounds of communication, it was learned that the hydraulic relief
valve had been developed for half a year, he found more than 20 manufacturers,
communicated with more than 300 emails in total, and paid the development cost
for 3 times, but all failed, and his mood was extremely bad.

Ellenburger said that when he saw AAK reply that we can produce this hydraulic
relief valve, his first feeling was that the manufacturer who responded so
quickly should not be very good, so he ignored us. He thought that AAK would
certainly follow up by email within a week, but to his surprise, AAK didn't
send any email for a month, so he began to pay attention to AAK hydraulic valve
slowly. In AAK website, he saw the stories between AAK and many customers, and
some cases made him admire AAK very much, therefore, he believes that AAK is
the ideal manufacturer of his samples this time. I was also moved by him and
promised him that if AAK sample failed, I would be willing to return the
development fee. At the same time, I also reminded him that if AAK could not
get the hydraulic relief valve done successfully, there was no need to find
other hydraulic relief valve manufacturers in Ningbo.

After 45 days, 20 samples of hydraulic relief valves were sent after passing
the internal test. Last week, Ellenburger informed us by email that AAK
hydraulic relief valve samples passed the test, and each parameter met the
requirements. Although 2 million performance tests have not yet yielded
results, he believes there will be no problem, because from the test process,
the hydraulic relief valve samples of the other 3 factories are not at the same
level as AAK's.

For the hydraulic relief valve with high requirements, AAK 3 major advantages
are admirable to Ellenburger, and I believe most customers can't achieve it.

1. AAK selects 100Cr2 bearing steel and adopts carbonitriding heat treatment
process. It is infiltrated for 13 hours at a high temperature of 820-830
degrees, then oil quenched, cryogenic treatment from -60 degrees to -70
degrees, and tempering treatment from +150 degrees to +160 degrees. The
hardness is guaranteed to be HRC68 or above. Wear resistance, high pressure
resistance and durability have a good foundation.

2. AAK hydraulic relief valve uses ultra-high hardness diamond reamers for
valve hole processing, especially good at hard material grinding, complete
grinding, no trace. The accuracy of valve hole is guaranteed to be within 1-
2μm, the surface roughness reaches Ra0.2-0.3, and the coaxial accuracy data is

3.AAK has experienced technicians who have been in the factory for more than 12
years and have 30 years of industry experience. There are specially assigned
personnel and special machines, and the operation is flawless.

AAK hydraulic relief valve, produced with American materials, Swiss equipment,
German knives, and by 30-year technicians, you can also have a small try! , l/hydraulic-relief-valve-aak275
AAK Hydraulic Relief Valve 3 Major Advantages to Meet 3 High Requirements
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