AAK hydraulic check valve solved Liebherr’s problem in 18 days

Daniel is a purchaser of Liebherr branch in Germany. He is responsible for the
procurement of hydraulic components. He has done an excellent job some time ago
and has been praised by his supervisor for many times. Before the shopping
season, he wanted to relax and planned to go on vacation with his family next
week. A phone call from the boss disrupted all his plans. A major dealer in
Sweden asked for help for a excavator produced by their company within 1 week .
His engineer came to the user for routine maintenance and found that there was
oil leakage in the hydraulic system. After pressure test, it was found that
there was oil leakage in the hydraulic check valve, and 12 excavators had such
faults.

Daniel hurriedly contacted the American supplier for this hydraulic check
valve, and got the reply that it was too cold in Sweden at this time. For such
high-frequency operation, even if the hydraulic check valve was replaced, it
was estimated that the hydraulic check valve would still leak oil 1 week later.
Unless more low temperature resistant sealing rings are used, this will take
time to test, but the finishing time is to be determined. Daniel was so
helpless, he had to find a new hydraulic valve supplier. Daniel asked several
local hydraulic valve manufacturers. They either didn't have time to produce or
require over 50pcs MOQ. After knowing these situations, the supervisor asked
Daniel to give the dealer a plan that can be implemented within 10 days. Daniel
had to cancel the vacation.

Daniel thought of AAK HYDRUALIC VALVE who he had contacted for inquiry before.
He emailed us to ask whether we can produce the hydraulic check valve for the
excavator, which needs to be resistant to low temperature. According to the
drawings and working conditions provided by him, we advised that it takes 20
days to customize. All our existing hydraulic check valves are not close to
this size. Daniel reiterated the hydraulic check valve needs to be low
temperature resistant, and frankly told us what they are currently
experiencing. I answered directly that the core lies in the low temperature
resistant sealing ring. Daniel felt that maybe AAK could solve this problem.

After 18 days, we sent a sample of hydraulic check valve. The test results
proved Daniel's feeling. The parameters passed the test and there was no oil
leakage at low temperature. The order for 12 hydraulic check valves was also
easily confirmed. Daniel's hanging heart can finally be put down.

Daniel asked why American hydraulic valve manufacturer needs time "to be
determined" to test, and we solved it in 18 days. Why German hydraulic valve
manufacturer is unwilling to do this small quantities, but it is OK for AAK
hydraulic valve. At the same time, the price of AAK hydraulic valve is cheaper
than that made in Germany and that made in the United States.

The zero leakage hydraulic valve not only has strict requirements on accuracy,
but also strict requirements for the sealing ring due to different media or
different scenarios. The sealing ring not only needs to be sealed, but also
needs to automatically improve its sealing effect with the increase of the
pressure of the hydraulic oil. It also needs not to leak under the harsh
working environment such as low temperature or high temperature. 1 year ago, a
Russian customer of AAK hydraulic valve put forward the requirement of low
temperature resistance. We spent 6 months, experienced 3 failures and 6 seal
ring material tests, and innovated a seal ring polymerized with polyurethane
elastomer and special rubber from the perspective of friction coefficient. Its
low temperature critical point is - 45℃, and its wear resistance, oil
resistance, fatigue resistance and vibration resistance can meet high-frequency
operation. It was mass produced 1 year ago.

AAK delivered 12 hydraulic check valves to his dealer. After all installation
and commissioning, they worked continuously for 2 weeks without abnormalities.
The Swedish dealer was very satisfied with the high standard after-sales
service provided by Liebherr branch. Daniel was very happy. His supervisor gave
him special permission to spend more days with his family.

AAK zero leakage hydraulic check valve was delivered to Liebherr. You can feel
at ease to have a small try.

https://www.aakindustry.com/info-detai , l/hydraulic-check-valve-aak117

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