AAK Hydraulic valve blocks with no deviation in valve hole accuracy

Sumarokov comes from Russia and has been engaged in the procurement of
hydraulic valve blocks for 7 years. His boss also thinks highly of him. At the
beginning of the year, Sumarokov needed to purchase a hydraulic valve block for
use in a hydraulic tractor. He took samples from local hydraulic valve block
manufacturers, and the test run was smooth. But he didn't expect that 1 month
after the sale of the hydraulic tractors, some customers complained that the
equipment was unstable and there was leakage at the hydraulic valve block
aperture, but the original hydraulic valve block manufacturer thought that it
had nothing to do with their hydraulic valve blocks. There were more and more
complaints from customers, but the original manufacturer did not cooperate, and
Sumarokov had a big headache.

On B2B, Sumarokov saw many articles about hydraulic valve blocks from AAK and
left us a message: can you ensure that every valve hole of hydraulic valve
blocks is processed without deviation? I guessed that the machining accuracy of
the holes of the hydraulic valve blocks he purchased was uneven. After
communication, I learned that he was in trouble. I told him that most hydraulic
valve block manufacturers use 5 processes of drilling, reaming, spot facing,
reaming and grinding to process the valve holes. The hidden trouble is that in
the process of hole reaming and grinding, the expansion of the orifice is not
easy to control, and the aperture may not be absolutely consistent.

I suggested Sumarokov directly trying AAK samples of the hydraulic valve
blocks. Whether AAK can do it well or not, it does not depend by mouth. You can
tell by the samples directly. Sumarokov accepted my proposal and paid for the
development cost. After 25 days, 40 hydraulic valve blocks were sent out to
solve the customer's complaint first. Last week, Sumarokov said in an email
that it has been 3 months since AAK hydraulic valve block was installed on the
hydraulic tractor, and there is no complaint of leakage.

The hydraulic valve block looks simple, but in the processing of valve holes,
the processing technology needs to be determined according to different
accuracy requirements, not simple drilling, reaming, spot facing, reaming and
grinding. AAK is different and lead most hydraulic valve block manufacturers
with 3 points.

1. Choose the reamer. For the processing of the valve hole of this hydraulic
valve block, we use the reamer made of 50W6MO5G4V2A1 material with hardness of
HRC66 instead of the conventional W18Cr4V.

2. In terms of equipment, we use a high-precision machining center imported
from Switzerland. The roughness of the processed hydraulic valve block valve
hole can reach Ra value of 0.8-0.4μm. The ovality circle error and taper error
can be controlled within 0.01-0.02mm, and the valve hole size accuracy can be
controlled within 0.01mm.

3. In terms of processing technology, it is processed by 5 links: drilling,
reaming, rough reaming, fine reaming, and no edge reaming and squeezing. The
increase in the outer diameter of each link is controlled at 0.02mm, and
kerosene is used for cooling in the processing process. The cutting amount is
strictly controlled, and V = 2m / min and F = 0.3mm/n are implemented.

AAK hydraulic valve block, processed with good tricks and Swiss leakage free
seal technology, you can have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-valve-blocks-aak341

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