AAK hydraulic relief valve has a service life of at least 1 year under -55℃

Vasiliev is a purchaser from an oil field production company in Russia.
Although he has not been in office for a long time, his purchasing is very
smooth. Early last year, he purchased a batch of hydraulic relief valves for
the hydraulic system of drilling rigs for oil exploration in Alaska. The
testing on the hydraulic relief valve sample from the original supplier was
smooth, but the drilling machine was unable to start after working for about 3
months. It was judged on site that the hydraulic relief valve in the equipment
was leaking. After further disassembling the hydraulic relief valve, it was
found that the O-ring in the hydraulic relief valve was worn and broken.

Vasiliev contacted the original hydraulic valve manufacturer. The manufacturer
replied that the standard nitrile rubber (NBR) O-ring used for this hydraulic
relief valve has a service life of at least more than 1 year. He asked Vasiliev
to check the temperature of the working environment. When he learned that it
was extremely cold at - 50 ℃, the manufacturer said that the sealing ring of
the hydraulic relief valve can only be replaced once every 3 months, and there
is no other alternative sealing ring. Vasiliev was helpless and had to replace
the sealing ring of the hydraulic relief valve to maintain the start-up. Two
months after the new O-ring was installed, the hydraulic relief valve leaked
again. The engineer complained that the hydraulic relief valve purchased by
Vasiliev was too unreliable.

Vasiliev has to find new suppliers. He contacted with more than 30 hydraulic
valve manufacturers, including we AAK hydraulic valve. Nearly all manufacturers
replied that under the extremely cold condition of - 50 ℃, it is normal for
sealing ring to have a service life of only 2-3 months. Only a few hydraulic
valve manufacturers are willing to test new materials, but the lead time is to
be determined. After receiving the email, AAK just asked about the quantity and
delivery date, and told Vasiliev that our product quality can be guaranteed for
1 year under the extremely cold condition of - 50 ℃.

Vasiliev may have realized the AAK hydraulic valve is some different, and asked
about 4 why and 3 how in a short email. We replied that there is no need to
make sample for this hydraulic relief valve, because we produced a hydraulic
relief valve for a North American customer that was used under similar working
conditions the year before last. It has been used for more than 1 year and
there was no complaint about the leakage of the hydraulic relief valve.
Vasiliev was still rather in doubt about this, but he had no other choice
except to try AAK hydraulic relief valve, because other hydraulic valve
manufacturers either gave up or can not determine the lead time. After 30 days,
AAK delivered the hydraulic relief valve as scheduled. After the test was
normal, the original hydraulic relief valve was replaced.

6 months later, we asked Vasiliev whether the customer complained about the
abnormal hydraulic relief valve. Vasiliev said that AAK hydraulic relief valve
was in normal use. His boss was surprised that AAK had done something that more
than 30 other hydraulic valve manufacturers could not do. Now the new project
is to be developed, and the boss requested that the hydraulic relief valve
should be purchased from AAK.

AAK hydraulic relief valve uses ZnO / MAA reinforced hydrogenated nitrile
rubber (HNBR) O-ring.
The high temperature resistance of this O-ring is 130 ~ 180 ℃, and the cold
resistance is - 55 ~ - 38 ℃. Compared with the ordinary nitrile butadiene
rubber ring, silicon rubber, fluororubber, Polytetrachloroethylene O-ring, it
has better performance on cold resistance and radiation resistance, is more
suitable for extreme cold environment, and can greatly improve the service life
of O-ring. AAK hydraulic relief valve with specially treated hydrogenated
nitrile rubber (HNBR) O-ring can still be used for more than 1 year even under
the extremely cold condition of - 55 ℃, and this Russian client don't want to
find a second hydraulic relief valve supplier any more.

AAK hydraulic relief valve has a service life of at least 1 year under
extremely cold conditions of - 55 ℃. Welcome to have a small try!

https://www.aakindustry.com/info-detai , l/hydraulic-relief-valves-aak147

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