AAK redesigned the hydraulic check valve, solving the leakage problem

At the beginning of last year, Lawrence sent an email to ask for help. He is a
purchaser of a hydraulic equipment company in Italy and has cooperated with AAK
for 2 or 3 years. Almost all of the orders are a small number of hydraulic
check valves with high requirements. When encountering problems, he always asks
for help from AAK, and AAK is also happy to help him. After several rounds of
email communication, it turned out that the power unit for controlling the
hydraulic lifting column produced by their company had a customer complaint 3
months after sales. Their engineers found a leak on the valve block of the
power unit, that is, around the valve hole equipped with the hydraulic pilot
operated check valve. It is preliminarily judged that the leakage should be
caused by the wear of the seal of the hydraulic pilot operated check valve.
However, after dismantling the hydraulic pilot operated check valve, it is
found that the sealing ring is intact.

After Lawrence communicated with the original manufacturer of hydraulic pilot
operated check valve, they both thought that there should be no problem with
the hydraulic pilot operated check valve or valve block, because the test data
before shipping were qualified. The leakage problem should be caused by the
wrong operation of the installation personnel of their company. Lawrence seemed
to understand because it is true that the test result of the hydraulic pilot
operated check valve originally shipped was OK. Lawrence asked their engineers
to reinstall it. As a result, it worked normally and everyone thought the
problem had been solved. But 3 months later, the same problem happened again,
and the customer could not accept and requested to return goods. The boss was
very angry and asked Lawrence and the engineer to completely solve the leakage
problem of the hydraulic pilot operated check valve. This is why Lawrence
emailed to AAK for help.

AAK engineers analyzed according to the valve block integration diagram and the
drawing of hydraulic pilot operated check valve provided by Lawrence. There is
an assumption that the frequent vibration of the power unit of the hydraulic
lifting column affects the stability of the installation of the hydraulic pilot
check valve. Following this idea, it is found that the hole depth of the
threaded socket integrated with the valve is not enough, which leads to the
loosening of the jack position of the hydraulic pilot operated check valve.
This problem can only be solved by adjusting the depth of the jack, increasing
the thread torque of the hydraulic pilot operated check valve and increasing
the bonding area between the valve and the hole. The next day I emailed
Lawrence the idea of our engineer's. If we want to verify this idea, we can
only make samples. One month later, AAK sent the redesigned hydraulic pilot
operated check valve and integrated valve block to Lawrence.

Last week, Lawrence sent an email saying that after the hydraulic pilot
operated check valve and valve block redesigned by AAK were installed on the
equipment, so far, the hydraulic lifting column has been used without
abnormality. The customer was very satisfied that they finally solved the
leakage problem of the hydraulic pilot operated check valve at one time. His
boss also appreciated Lawrence for helping the company solve the after-sales
problem.

AAK hydraulic pilot operated check valve is cleverly designed to easily solve
the leakage problem. Welcome to have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-pilot-operated-check-valves-
aak172

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