AAK Hydraulic Cartridge Relief Valve used 3 tricks to cure system fever

These days, the epidemic has led to more fever cases. In a brewery in Brazil,
its hydraulic station also "ran a fever”. AAK hydraulic cartridge relief valve
was tailored to the case, with 3 tricks, helping Ledger's hydraulic system to
be transformed successfully.
 
Ledger is from Brazil. Some time ago, the hydraulic system in their workshop
continued to heat up, and the hydraulic cartridge relief valve of the system
could not unload normally, so the pressure regulation failed. Their engineer
needed to upgrade the hydraulic system and optimize the original hydraulic
cartridge relief valve. The original manufacturer of the hydraulic cartridge
relief valve said that it would take 2 months. The system upgrade was imminent.
Ledger had to look for other hydraulic relief valve manufacturers.

Ledger found me through the introduction of a local industrial product
enterprise MRO. AAK is the supplier of the MRO, which purchase SUN hydraulic
cartridge valves standard parts from AAK every month.
 
According to the drawings of Ledger's original hydraulic cartridge relief valve
and the existing conditions of the hydraulic system, we were not sure about the
root cause, so we asked Ledger to send us the original samples of the hydraulic
cartridge relief valve. A week later, we found that the root cause of the
system pressure failure was the spool of the hydraulic cartridge relief valve.
 
1. The accuracy of the valve spool is not enough. There is a 5% form and
position tolerance and a taper, causing radial clamping.
2. The damping hole on the main valve spool is blocked, which causes that the
oil pressure cannot be transmitted to the upper chamber of the main valve and
the front chamber of the pilot valve, and the pressure adjustment of the main
valve is lost.
 
I replied to Ledger that AAK had a plan to optimize the original hydraulic
cartridge relief valve, and it would take 4 weeks. 2 weeks after AAK sent the
optimized hydraulic cartridge relief valves, Ledger informed that after AAK
hydraulic cartridge relief valve was used, the pressure of the system returned
to the original 2MPa, the heating phenomenon disappeared, and various
parameters met the system upgrading requirements. 

AAK had a good idea. For this hydraulic cartridge relief valve, our scheme is
as follows:
 
1. The valve spool adopts a tapered shoulder, and the small end of the shoulder
faces the high-pressure area, which is conducive to the alignment of the valve
spool in the inner diameter of the valve hole, ensuring the form and position
tolerance, and avoiding the taper phenomenon.
 
2. Three pressure equalizing grooves with proper positions shall be opened on
the surface of the valve spool. The depth of the annular pressure equalizing
groove shall be the same, and the pressure equalizing groove shall be
concentric with the outer circle of the valve spool. This process is difficult
and most hydraulic cartridge valve manufacturers cannot afford it. AAK
hydraulic cartridge relief valve, with this trick, solves the sticking of valve
spool caused by radial imbalance force.
 
3. At the inlet section of the hydraulic cartridge relief valve, a welded
integral high-strength filter screen and local turbulence self-cleaning
function are set to reduce the impact of oil pollution on the normal operation
of the hydraulic cartridge valve, and 100% eliminate the blockage of the
damping hole.
 
AAK hydraulic cartridge relief valve, with tricks on processing, and the
performance is also stable, welcome to try!

https://www.aakindustry.com/info-detai , l/relief-valves-aak449

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