AAK Hydraulic Needle Valves 450bar over 1 Year service life

Carter comes from an excavator manufacturing company in Italy, and the purchase
of hydraulic needle valves has been smooth in recent years. At the beginning of
last year, an excavator sold by their company for less than 6 months was
complained by customer. The boom of the excavator falls too fast due to its own
weight, which is easy to cause danger. Their technician found that there was a
problem with the hydraulic needle valve of the hydraulic system. There were
obvious wear marks at the contact point between the valve spool and valve seat
of the hydraulic needle valve, which was easy to leak. The leakage of the
hydraulic needle valve will cause the oil saving and speed limiting circuit of
the hydraulic cylinder to be uncontrollable. The boss was very angry that the
equipment sold for only half a year was complained and asked Carter to find out
the cause of the hydraulic needle valve problem and solve it.

Carter contacted the original manufacturer of the hydraulic needle valves and
requested to replace the hydraulic needle valves. The manufacturer said that
the service life of hydraulic needle valves under 450bar working condition is
basically 6 months. The only way to solve this complaint is to replace the
hydraulic needle valves every 6 months. Such reply made Carter speechless,
because his customer would not accept the high-frequency replacement of
hydraulic needle valves, which not only brought a bad user experience, but also
the after-sales cost was not cheap. Carter contacted all of his hydraulic
needle valve suppliers, and they all replied that they were not sure to achieve
a hydraulic needle valve with a service life of 1 year under the working
condition of 450bar.

When browsing the website, he found AAK and left a message on the website: How
long is the service life of hydraulic needle valves with pressure resistance of
450bar? We replied directly for 1 year or more. The next day, he told the
problems encountered in purchasing hydraulic needle valves at the beginning of
last year in detail. After receiving the drawing of the hydraulic needle valve,
we found that the hydraulic needle valve needed by Carter has much higher
requirements than the ordinary hydraulic needle valves. We replied that AAK
will select specific materials for samples, which can ensure that the hydraulic
needle valves can be used for more than 1 year under normal conditions. If
possible, he can directly test the samples.

One month later, AAK sent 24 hydraulic needle valve samples. A year later,
Carter sent an email saying that the excavator with AAK hydraulic needle valves
still have not encountered boom problem yet. Among all of his hydraulic needle
valve suppliers, only AAK has a service life of more than 1 year.

The surface treatment of the valve body of AAK hydraulic needle valves adopts
electromagnetic induction heating. Its main advantages are fast heating speed,
light oxidation and decarburization of the workpiece surface, and the surface
hardening layer can be adjusted according to needs, which is easy to control.
The hardened layer has fine martensite structure and high hardness, strength
and toughness. After surface quenching, the surface of the workpiece has large
compressive internal stress, and the fatigue breaking resistance of the
workpiece is high. Using induction heating surface quenching, the number of
fatigue cycles under design load is about 10 times higher than that with
ordinary quenching and tempering treatment.

AAK hydraulic needle valves, special material selection, high pressure
resistance and durability, welcome to have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-needle-valves-aak183

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