AAK Hydraulic pressure control valves over 1 year of Service Life

Today, Eichendorff from Germany placed a re-order for 500 hydraulic pilot
operated pressure control valves and told us that his boss was very satisfied
with the quality of AAK. It has been more than 1 year since the last purchase
of hydraulic pressure control valves, and no customer complained about unstable
pressure supply. At the beginning of last year, one of their hydraulic power
units was complained by customers that the pressure supply was often unstable
after using a period of time. They judged that there was a problem with the
hydraulic pilot operated pressure control valve. After the valve was replaced,
the pressure supply of the equipment was normal. Eichendorff sent the replaced
valve back to the original hydraulic pressure control valve manufacturer. After
inspection, the manufacturer found that the parameters and functions were
produced according to the requirements of Eichendorff's company. He thought
that they had moved the pressure regulating screw of the hydraulic pressure
control valve during installation. After measurement, Eichendorff's engineers
found that all parameters of the original hydraulic pressure control valve
could be benchmarked, but they did not change the pressure regulating screw
during installation.

Eichendorff contacted several local German hydraulic pressure control valve
manufacturers, and most of them were unwilling to analyze. After browsing AAK
website on Google, Eichendorff sent an email and asked: what is the reason for
the unstable pressure supply of the hydraulic pressure control valve after
using a period of time? AAK HYDRAULIC VALVE often receives similar questions,
and we are happy to solve these problems, because this is the best source for
accurate customers. Eichendorff sent us the samples, drawings and hydraulic
system schematic diagram of the hydraulic pilot operated pressure control valve
the next day. 1 week later, AAK engineers disassembled the hydraulic pressure
control valve and found 2 possibilities in combination with various technical
parameters. First, the design of the damping hole of the hydraulic pilot
operated pressure control valve should be improved. The ratio of the opening
pressure to the set pressure is a little high, which will cause too large
pressure regulation deviation, thus affecting the stability of the valve.
Second, the type selection of the spring of the hydraulic pilot operated
pressure control valve is not suitable, and a spring with better elasticity is
required.

After receiving our diagnosis, Eichendorff hoped that AAK could test the
samples according to our ideas and was willing to pay the development cost. AAK
technical team spent 24 days and tried samples for 6 times, and found the most
suitable pressure ratio, adjusted the original design of the damping hole,
selected 3 springs with good elasticity to compare, and determined the special
SiCr alloy steel spring as the spring of the hydraulic pilot operated pressure
control valve. After 30 days, 30 samples were sent.

3 months later, Eichendorff informed by email that when AAK hydraulic pilot
operated pressure control valve was used, no customer complained about unstable
pressure supply. I replied that according to previous customer feedback, there
will be no customer complaint about unstable supply within 1 year. Eichendorff
probably didn't believe it until 1 year later, today, the reorder of the
hydraulic pressure control valve came. Eichendorff admired AAK service and
professionalism from the bottom of his heart.

AAK hydraulic pressure control valve is not only professional, but also good at
what peers are unwilling to do. Welcome to have a try!

https://www.aakindustry.com/info-detai , l/hydraulic-pressure-control-valves-
aak257

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