AAK hydraulic relief valve has 8% higher stability than German brand

German customer David has been purchased hydraulic relief valves in Ningbo in a
same factory. At the beginning of last year, David purchased a batch of
hydraulic relief valves for crane system in AAK because the original supplier
was not able to meet the delivery. He sent an email last week saying: "with AAK
hydraulic relief valves, the stability is 8% higher than that of the original
supplier, and there is almost no external leakage". This surprised him. The use
experience of AAK hydraulic relief valves has benchmarked with their previous
local hydraulic relief valve manufacturers in Germany.

The vast majority of hydraulic valve bodies are made of nodular iron,
vermicular iron and gray iron and cast with resin sand as the molding medium.
Therefore, there is sticky sand in the casting, which is easy to pollute the
oil system and block the valve and filter, which is the key factor affecting
the stability of hydraulic relief valves. Most of the common sand cleaning
methods of hydraulic relief valves used in the industry are shot blasting and
electrochemical sand cleaning, all of which have limitations.

1. Shot blasting can not completely remove the sticking sand from the valve
hole with complex structure and small oil passage, which is easy to affect the
tightness and product accuracy, and is not conducive to the stability of the
hydraulic relief valves.

2. Electrochemical sand cleaning can relatively remove the sticky sand in the
narrow oil passage, but it has high energy consumption, high operation
intensity of workers, easy to have human errors, can not completely remove the
sticky sand, and is not conducive to the stability of the hydraulic relief
valves.

Improving the quality of hydraulic parts processing process, improving the
cleanliness level and ensuring the stability of hydraulic relief valves has
always been the hard index of AAK hydraulic relief valves. Auxiliary processing
of hydraulic parts mainly includes: sand cleaning of valve body, deburring or
residue treatment of parts and cleaning of hydraulic parts. How does AAK do the
sand cleaning of hydraulic relief valves?

AAK technical team has continuously improved the sand cleaning process of
hydraulic relief valves after years of technical improvement. For the sand
cleaning of small complex castings, AAK has its own unique AAK sand cleaning 5
methods, namely: artificial aging - Pickling - rinsing - rust prevention -
ultrasonic cleaning. Artificial aging is used to reduce the binding force
between the casting and sand, acid pickling is used to remove the oxide skin at
the joint between the sand and the casting to peel the sand from the casting,
and then the explosion of compressed air during ultrasonic cleaning is used to
peel off the sand, so as to achieve the purpose of sand cleaning.

AAK has its own unique advantages of AAK sand cleaning 5 methods: (1) it is
less affected by the casting structure; (2) it is carried out before machining
and does not affect the arrangement of machining process; (3) although it has a
certain impact on the environment, antifogging agent is added during pickling
to reduce the impact. At the same time, corresponding corrosion inhibitor is
added during pickling, and rust prevention treatment is carried out immediately
after rinsing to ensure the stability of hydraulic relief valves. This is also
the reason why the stability of AAK hydraulic relief valves is more than 8%
higher than that of other manufacturers.

The stability of AAK hydraulic relief valves comes from AAK unique and
efficient sand cleaning methods. You are welcome to try an order!

https://www.aakindustry.com/info-det , ail/hydraulic-relief-valves-aak189

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