AAK Improved the Standard Deviation of Hydraulic Check Valve

One morning in the first half of this year, shortly after Sam arrived at the
company, the boss asked him to come to his office. He realized whether there
was a complaint about the hydraulic valve. He saw that the technical director
was also in the boss's office. It turned out that the hydraulic check valve
installed on the hydraulic pump had leakage in different proportions. These
hydraulic pumps were due to ship in 20 days. The boss asked him to purchase the
qualified hydraulic check valve in 40 days, because their customer only gave
the company a 4-week extension.

The technical director informed that according to the on-site detection, about
20% of the hydraulic check valves had leakage. After dissection, it was found
that the gap between the valve body hole and the valve spool of these leaking
hydraulic check valves was uneven, and some even exceeded 40μm. The gap
dimensions are quite different. Sam immediately contacted the original
hydraulic valve manufacturer and asked him to replenish 30% to replace those
unqualified hydraulic check valves, but he was rejected. Per the original
hydraulic valve manufacturer, these hydraulic check valves passed the
inspection before delivery and the leaked hydraulic check valves were caused by
their improper installation. In the end, the manufacturer didn't even reply to
his email. Sam was angry and had to find a new supplier of hydraulic check
valve.

Sam found AAK HYDRAULIC VALVE in Google and browsed AAK website
(www.aakindustry.com), which made him see the dawn and feel that AAK hydraulic
valve is different. He emailed us inquiry about the hydraulic check valve and
truthfully informed us of the problems he encountered with the Chinese
hydraulic valve manufacturer. After several rounds of e-mail communication and
integrating the drawings and operating conditions provided by Sam, AAK promised
him to offer qualified hydraulic check valve samples within 14 days. If the
samples are qualified, the 30% of quantity that he needs can be delivered in 4
weeks.

After 14 days, Sam received the hydraulic check valve samples. There was no
leakage after installation and commissioning, and the gap between the valve
body hole and the valve spool of each hydraulic check valve could be stable
within a range and uniform in size. The technical department told him that the
standard deviation (sigma) accuracy of the clearance dimension of AAK hydraulic
check valve was more than 3 times higher than that of the original supplier.
Sam was surprised how AAK hydraulic valve was different?

The whole line of production equipment of AAK hydraulic valve is a high-
precision machine tool and processing center imported from Switzerland. The
core materials are imported from Germany and South Korea, ensuring the
production accuracy of valve body and valve spool. The valve spool diameter of
this hydraulic check valve is greater than 20mm, and the gap between the valve
body and the valve spool needs to be 15μm-25μm, which is an industry
requirement, but AAK uses 15μm-20μm as the hard index for production, which
is 25% higher than the industry standard. Before each batch of production, the
accuracy of each axis of the machine tool needs to be tested, including
positioning accuracy, repeated positioning accuracy and reverse positioning
accuracy. After obtaining the test data, the accuracy can be compensated. Most
hydraulic valve manufacturers ignore this link. That is why the gap dimension
standard deviation (sigma) accuracy of AAK is more than twice that of Sam's old
hydraulic valve supplier.

AAK completed 30% quantity of hydraulic check valves on schedule. Sam solved
the unsuccessful procurement without danger. The boss praised him for
completing the procurement on schedule and suggested him to find more hydraulic
valve suppliers like AAK.

AAK hydraulic check valve has guaranteed quality and after-sales service. Our
quality benchmarked with international first-line brands. You can also give it
a try.

https://www.aakindustry.com/info-detai , l/hydraulic-check-valve-aak123

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