AAK Hydraulic Directional Control Cartridge Valve Sealing Ring 5 Controls

Nestor is from Greece. He has been purchasing hydraulic cartridge valves for 3
years smoothly. A hydraulic directional control cartridge valve bothered him
recently. At the beginning of last year, the hydraulic directional control
cartridge valve he purchased had leakage, which led to the loss of pressure in
the oil circuit of the system. The root cause was the wear of the sealing ring.
The original hydraulic directional control cartridge valve manufacturer said
that the sealing is a standard O-ring and a single-side PTFE retaining ring,
which is an industry standard. If there was a leak, it could only be replaced.
It was not acceptable to replace it within 6 months. Nestor realized that this
cartridge valve manufacturer was unreliable.

Nestor found AAK hydraulic cartridge valve website on Google, noticed several
AAK cases about the sealing ring, and left us a message: Can the sealing ring
of each hydraulic directional control cartridge valve be guaranteed to be free
of wear for 1 year under the high pressure of 350bar? After communication, I
learned that he had a problem with the sealing ring of the hydraulic
directional control cartridge valve. I replied that regarding the sealing ring,
not only the medium but also the material, shape, structure and installation
should be considered. Only 5 aspects can be considered comprehensively to
determine the most suitable sealing ring. Blind copying of industry standards
may lead to leakage. Nestor required AAK samples. After 30 days, AAK sent 20
samples of hydraulic directional control cartridge valves.

Last week, Nestor sent an email to inform us that AAK hydraulic directional
control cartridge valve has been used for 13 months without any customer
complaints about leakage. I told him that there would be no complaints in
another half a year. This hydraulic directional control cartridge valve, AAK
matches the sealing ring from 5 aspects, and does not follow the industry
standard. The sealing ring of AAK hydraulic directional control cartridge valve
has unique skills. The outer circumference of the main sealing lip is installed
on the inner wall of the valve hole, which reduces the contact area between the
sealing structure and the valve hole, reduces the friction between the sealing
structure and the valve hole, and increases the service life by at least 2
times. The support ring can reduce the dependence of the hydraulic directional
control cartridge valve sealing system on the retaining ring, and avoid the
possibility of damage due to improper installation of the retaining ring.

1. Polyurethane material is selected to replace the original rubber material.
The plane projection of the sealing ring is circular, and the middle part is a
set hole. The inner wall of the sleeve hole is smooth and fits at the bottom of
the sealing groove of the hydraulic directional control cartridge valve. High
in the middle, low at both ends, symmetrical structure.

2. The shape of the seal ring is high in the middle and low at both ends. It
has a symmetrical structure, left, middle and right. The left and right parts
have high-strength support rings, and the middle part is the main sealing lip.

3. The support ring makes the cross section of the seal ring in "D" shape,
avoiding the possibility of the seal ring being cut by the valve hole during
the installation of the hydraulic directional control cartridge valve.

AAK hydraulic directional control cartridge valve, sealing ring is controlled
from 5 aspects, ensure 18 months of service life without worry, you can also
try it!

https://www.aakindustry.com/info-detail , /directional-control-cartridge-valves-
aak532

Click to Enlarge