AAK Hydraulic Threaded Cartridge Valve, No Red Rust in Salt Spray Test

Erdmann has been a purchaser of German HAWE company for 5 or 6 years and has
been doing very well. Last month, the company had a special hydraulic threaded
cartridge valve to purchase. Because it is to be used in the Arctic region, the
corrosion resistance of hydraulic threaded cartridge valve needs to be very
high. The boss asked him to identify the suppliers and approve the samples
within 2 months. Erdmann felt that it could be completed within 20 days. He
sent the drawings of hydraulic threaded cartridge valves to the original
hydraulic valve manufacturers. Only 2 weeks later, he received samples of
hydraulic threaded cartridge valves from one factory. The surface gloss of
these samples of hydraulic threaded cartridge valves was quite good. The
company tested them on the exploration drilling machine and delivered it
quickly to the customer.

3 months later, the customer complained that the hydraulic threaded cartridge
valve on the hydraulic pump was seriously corroded, some threads were stuck,
the equipment could not be started, and the test run was unsuccessful. The boss
thought that Erdmann was careless and ignored the use scene of the Arctic
region. The boss again asked him to make new samples and do salt spray test
inside the company. Actually, Erdmann emphasized that the hydraulic threaded
cartridge valve is to be used in the Arctic region. The original supplier said
that their hydraulic threaded cartridge valves have good gloss and corrosion
resistance, and can be used in the Arctic region.

Erdmann communicated with the original hydraulic threaded cartridge valve
supplier again, and the reply was that most hydraulic valve manufacturers just
adopt the zinc plating process, and he used the nickel plating process which is
the highest level of corrosion resistance. Erdmann realized the difficulty of
corrosion resistance in the Arctic regions. Erdmann emailed more than 20
hydraulic valve manufacturers who had been contacted before, emphasizing that
the hydraulic threaded cartridge valve must be in the highly corrosive
environment in the Arctic region, and the service life shall not be less than 9
months. Only 3 hydraulic valve manufacturers said they could have a try, but
there was no response from other manufacturers. Erdmann was a little flustered.

Erdmann saw AAK hydraulic valve on Google, who supplied to hydraulic pump
company in Russia. He felt that AAK might give him a glimmer of hope. He
emailed us to ask if we can produce hydraulic threaded cartridge valves to be
used in Arctic regions. We directly replied that the components of the valve
should be treated by special electroplating process in order to meet the
condition in the Arctic regions. After 20 days, AAK sent samples according to
his hydraulic threaded cartridge valve drawings. HAWE company conducted salt
spray test on samples from all 4 manufacturers, with the corrosion condition
twice that of Arctic regions.

More than 2 months later, Erdmann informed us that AAK hydraulic threaded
cartridge valve had no red rust after more than 1500 hours of salt spray test.
At the same time, the company's engineers determined that AAK hydraulic
threaded cartridge valve had no problem to be used in the Arctic regions for 1
year. While the samples from other manufacturers began to produce red rust in
more than 120 hours, and there were white corrosion products on the coating
surface.

Erdmann hesitated to report to his boss because the quotation of AAK hydraulic
threaded cartridge valve is 30% higher than that of other suppliers. The
surface electroplating process of AAK hydraulic threaded cartridge valve is
zinc nickel alloy coating, which has high requirements for steel heat
treatment. It may be difficult to find a second factory in Ningbo who can go
through both of these two processes smoothly. In addition, the process cost is
more than 5 times higher, but the corrosion resistance is more than 10 times
higher than the general zinc plating and nickel plating process. With these
data, the communicated between Erdmann with the boss is very efficient. The
boss mentioned that for all those valves with high standard and high working
conditions, just to choose AAK hydraulic valves.

AAK hydraulic threaded cartridge valve will not corrode in the Arctic regions
even after being used for 1 year. Welcome to have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-cartridge-valves-aak136

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