AAK Hydraulic Proportional Valve 3 Tips No Jamming Benchmarking SUN

Ewalz is from Turkey, and mainly purchases standard parts of hydraulic
cartridge valves from Ningbo China. Recently, they developed a hydraulic
manifold that requires the use of SUN proportional valves. He purchased it from
a proportional valve manufacturer in Ningbo, and after 2 weeks of operation,
the equipment experienced significant vibration. The on-site engineer found
that the proportional valve was severely stuck. The original hydraulic valve
manufacturer stated that this proportional valve is a replica of SUN, with
fully calibrated parameters, but there are differences in performance. Ewalz
was speechless and had to look for a new hydraulic valve manufacturer for this
proportional valve.

Ewalz browsed the AAK hydraulic valve website, stayed for nearly 15 minutes and
left a message:

1.Does AAK have an existing program for benchmarking SUN proportional valves?
2.Can AAK completely solve the problem of valve spool jamming, vibration and
noise?

After communication, it was learned that the hydraulic manifold they developed
was very tight on time, they had no time to customize it and could only choose
the existing SUN proportional valve. The proportional valve produced by the
original valve manufacturer has the same function as SUN, but has poor
performance.

This SUN proportional valve is widely used, and AAK have a record of 6
shipments last year. There has never been any jamming of the valve spool, and
we have inventory, which fully meets his requirements.

2 weeks after AAK sent the SUN proportional valve samples, Ewalz informed us
via email that the hydraulic manifold debugging was successful. 2 months later,
Ewalz informed us that their engineers were satisfied with the AAK proportional
valve. The root cause of unsatisfactory performance of the original valve
manufacturer's SUN proportional valve lies in its accuracy. The vast majority
of proportional valve manufacturers have a cylindricity machining accuracy
greater than 5um, which is 70% lower than the SUN standard cylindricity. For
the accuracy of proportional valves that is completely in line with the SUN
standard parts, there are probably less than 3 hydraulic valve manufacturers in
Ningbo China. AAK controls the accuracy of the proportional valve from 3
aspects:

1.AAK proportional valve spool control: The valve spool is produced using a
German CNC lathe with one blade and then high-precision cylindrical grinding.
The machining error is controlled within ± 1um, and the coaxiality and
cylindricity are controlled within 3um.
2.AAK proportional valve hole control: Adopting Swiss honing processing, the
accuracy can reach IT6-IT7 level, and the surface roughness can reach Ra0.2-
0.025um.
3.AAK proportional valve spool and hole fitting accuracy control: 30 years of
experienced technician operation, fit tolerance zone hole H6, axis g5, fit
clearance tolerance can reach 5-12um, valve spool without jamming.

AAK proportional valve, no jamming, the manufacturing quality, function and
performance, benchmarking SUN, you can give it a try.

AAK HYDRAULIC VALVES (591) 2023-05-25

https://www.aakindustry.com/info , -detail/proportional-valves-aak591

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