AAK Hydraulic Cartridge Pressure Control Valve High Precision & Stability

Brishen is from Brazil. He has been purchasing hydraulic valves for 4 years
smoothly, but was stumped by a hydraulic cartridge pressure control valve
recently. At the end of last year, their customer wanted to customize a
hydraulic power unit for the hydraulic system of aviation equipment, which has
high requirements for the cartridge pressure control valve. Brishen chose a
local manufacturer who has cooperated with their company for 3 years to make
samples for the hydraulic cartridge pressure control valve. 2 weeks later, the
manufacturer reported that it was too difficult to process this hydraulic
cartridge pressure control valve. Especially, the length diameter ratio of the
slim hole of the valve spool guide sleeve was 11∶1, and the hole cylindricity
was within 2μm, the scrap rate of the sample is 50%, and the processing
efficiency is extremely low and it is too difficult to control the
cylindricity. Brishen contacted more than 10 cartridge valve manufacturers. No
factory was willing to make samples. They either rejected due to small qty or
could not overcome the processing difficulty. Brishen was worried.

In B2B, Brishen noticed the article about the length diameter ratio processing
of AAK hydraulic valve, and felt that the length diameter ratio of 11∶1 might
not be a problem for AAK. He emailed me to ask that for the hydraulic cartridge
pressure control valve, with the length diameter ratio of the slim hole of the
valve spool guide sleeve as 11∶1, and the hole cylindricity within 2μm,
dimension tolerance within 1μm, what is the lead time and development cost for
AAK to make samples? My reply: Thank you for your trust in AAK. This
cylindricity precision is high, and ordinary cartridge valve manufacturers
can't make it. Similar processing technologies were produced in batches by AAK
3 years ago, and now it is more and more mature. After 50 days, AAK sent 12
samples of hydraulic cartridge pressure control valves.

1 month later, Brishen sent an email to inform that their engineer was
satisfied with the size and accuracy of the AAK hydraulic cartridge pressure
control valve. It was installed on the hydraulic power unit, and the overall
operation was stable. The equipment had been delivered to their customer. It
was estimated that there would be a batch order 6 months later. AAK hydraulic
cartridge pressure control valve indirectly controls the cylindricity from the
3 factors of straightness, taper and roundness during processing, including 3
points:

1. In the rough machining link, the gun drill is improved and a new process is
developed. First, a pilot hole is machined. The coaxiality of the machined hole
is within 0.02mm and the straightness is within 0.01mm.

2. In the rough honing process, the honing rod with the size of about 120% of
the hole length is selected, and the straightness of the valve hole after
processing can reach within 3μm, the taper reaches within 2μm. Most cartridge
valve manufacturers are easy to make bell mouth because of the poor grasp of
the honing bar size.

3. In the finishing link, first trim the grinder with a taper of within 0.3μm,
set the length of the grinder to 90% of the hole length to ensure the
cylindricity of the slender hole of the valve sleeve is within 2μm, dimension
tolerance is within 1μm.

AAK hydraulic cartridge pressure control valve, with high precision and
stability, you can also have a small try!

https://www.aakindustry.com/info-detai , l/cartridge-pressure-control-valves-
aak428

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