AAK Hydraulic Cartridge Proportional Needle Valve Dual Function

Devante is from a Spanish hydraulic equipment manufacturing company, and has
been engaged in procurement for more than 5 years. Last February, they upgraded
an injection molding machine, focusing on the selling point of "high speed when
empty, low speed when heavy load". The engineer asked Devante to purchase the
hydraulic cartridge proportional needle valve of HydraForce. During the
equipment commissioning, it was found that the pressure relief and flow of the
hydraulic system of the equipment was conflicted with the hydraulic cartridge
proportional needle valve, resulting in unstable operation of the equipment and
jitter. HydraForce said that there was no time to customize the hydraulic
cartridge proportional needle valve. Devante contacted several cartridge valve
manufacturers and had no news. Devante was very worried.

Devante browsed AAK website on Google and left a message:
1. Can AAK customize the hydraulic cartridge proportional needle valve, and the
performance benchmarking HydraForce?
2. The function of smooth flow passage is required.
3. The function of variable flow gain is required.

At the beginning, I thought that he was requested for AAK hydraulic cartridge
proportional needle valve to benchmark the standard parts of HydraForce, but it
was turned out that he needed us to optimize the standard parts of HydraForce.
According to the equipment abnormality video, the original hydraulic cartridge
proportional needle valve drawing, and their required functions sent by
Devante, after discussion, AAK engineers was 90% confident. Devante asked AAK
to make samples. After 40 days, AAK sent 15 samples of cartridge proportional
needle valves.

2 months later, Devante informed that the market promotion of the upgraded
equipment was smooth. Their engineers were satisfied with AAK hydraulic
cartridge proportional needle valves, especially its variable flow gain
characteristics, and smooth flow characteristics, small pressure impact during
pressure relief, and accurate flow control. We mainly made 3 ingenious actions
on the valve housing and valve spool, and solved the problem that HydraForce
didn't want to do.

1. The lower part of the valve spool is arranged in the valve housing and
sealed with the valve housing line. The upper part of the valve spool is
connected with the control cover plate, the upper end of the control cover
plate is connected with the valve cover with threaded holes, and the
displacement sensor is installed on the threaded holes of the valve cover. The
lower end of the valve spool is connected with the upper cavity of the valve
spool. When the valve spool is at the lowest end, the valve is closed. When the
valve spool moves upward, the valve gradually opens.

2. The lower end of the valve spool bottom is equipped with a semicircular
slotted orifice. When the valve opening is small, the flow gain is small, and
has good linearity, small flow, and high-precision linear control. When the
valve opening is large, the flow gain is large, and it has good linearity,
large flow and high-precision linear control to ensure the variable flow gain
function of the hydraulic cartridge proportional needle valve.

3. The valve housing is provided with 4 symmetrical waist-shaped holes,
replacing the conventional round holes. The oil flows in from the lower port of
the valve spool and flows out through the waist hole, reducing the pressure
impact and speed sudden change of the oil near the valve port of the hydraulic
cartridge proportional needle valve, and realizing the function of smooth flow.

AAK hydraulic cartridge proportional needle valve, has dual functions of
variable flow gain and smooth flow. You can also try it!

https://www.aakindustry.com/info-detail , /cartridge-proportional-needle-valves-
aak473

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