AAK Hydraulic Pressure Control Valve For Military Industry

Krischnan, from Greece, has been engaged in the procurement of hydraulic valves
for 6 years. At the beginning of the year, their hydraulic power unit used in
military equipment needed to purchase hydraulic pressure control valves.
Krischnan selected a supplier who has cooperated for 4 years to sample the
hydraulic pressure control valve, which is required to be leak free and free of
jamming. 1 month later, the accuracy of the hydraulic pressure control valves
produced by the original manufacturer did not meet the equipment requirements,
but this has already been the manufacturer's limit. Krischnan can only re
select the manufacturer of the hydraulic pressure control valves and specially
note with specific accuracy requirements that the cylindricity of the inner
hole of the valve cage needs to below 2μm, the surface roughness is Ra0.15. He
contacted more than 10 hydraulic valve manufacturers in 1 week, and only 2
manufacturers were willing to sample, but they still did not meet the equipment
requirements. More than 2 months of time wasted, Krischnan became very anxious.

Krischnan found AAK at Google and left a message asking whether there were
hydraulic valves for military equipment. I was not sure about his purpose, so I
gave an irrelevant answer that AAK had supplied hydraulic valves for aerospace
4 years ago. Krischnan sent the drawing of the hydraulic pressure control valve
the next day, emphasizing that it was used for military equipment and reminding
the machining accuracy and geometric accuracy. He seemed to be afraid of
another failure, stressed and reminded again and again.

3 days later, I told him that we are 90% confident to be successful. If AAK
also failed on this hydraulic pressure control valve, he would not need to go
around in Ningbo again. The next day, Krischnan paid the development fee. After
45 days, AAK sent 30 samples of hydraulic pressure control valves.

At the beginning of last month, Krischnan said in an email that although the
time of AAK samples was longer than that of other hydraulic valve
manufacturers, the AAK hydraulic pressure control valve was recognized by the
engineer and the equipment commissioning was smooth. At the same time, he also
sighed: after 3 rounds, only AAK was found to be able to produce the hydraulic
pressure control valves that can be used in military industry.

AAK focuses on 3 points to control the accuracy of the valve hole in the valve
cage of the hydraulic pressure control valves:

1. The valve cage inner hole processing process was re optimized in 6 steps:
drill the top hole with deep hole drill, vacuum quenching, rough honing, semi
fine honing, artificial aging treatment, fine honing, and the process
parameters were reset. Most manufacturers of hydraulic pressure control valves
can only achieve 3 steps: vacuum quenching, rough honing and fine honing.

2. As for the details of honing, 0.04mm full honing allowance shall be reserved
during rough honing of inner hole to lay a good foundation for subsequent fine
honing and grasp the stress generated by honing. Here, skill is required, which
is also a key step of accuracy.

3. More attention is paid to fine honing. An oilstone made of cubic boron
nitride is used for fine honing. After fine honing, the cylindricity of the
inner hole of the valve cage is below 1.5μm and the surface roughness is below
Ra0.1μm.

AAK hydraulic pressure control valve, 6-step optimization, 2 detailed points,
you can also try a small order!

https://www.aakindustry.com/info-det , ail/hydraulic-pressure-control-valves-
aak355

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