AAK Hydraulic Cartridge Relief Valve Buffering Function Easy Operation

Clinton, from Mexico, has purchased hydraulic valves from China for 6 years,
and has cooperated with AAK in several non-standard hydraulic cartridge valves.
Some time ago, some customers complained that their logistics transmission
equipment was not easy to operate. After the after-sales inspection, it was
found that the hydraulic cartridge relief valve on the rotary device failed to
buffer and the pressure regulation was not smooth. The original manufacturer
said that this hydraulic cartridge relief valve was benchmarked to the standard
parts of HydraForce, and he was unable to optimize.

Clinton contacted me and asked me how to make the hydraulic cartridge relief
valve easy to adjust pressure and have buffering function. According to the
hydraulic schematic diagram and the original hydraulic cartridge relief valve
drawing provided, AAK engineer found that the requirements can be met as long
as the original structure is improved. After 35 days, AAK sent 20 samples of
hydraulic cartridge relief valves.

Last week, Clinton sent a PO for 200 hydraulic cartridge relief valves. He said
that when AAK hydraulic cartridge relief valve was installed, the customer no
longer complained. It not only provided convenient pressure regulation and
effective buffering, but also improved the stability of the equipment. They
planned to replace the whole batch of equipment with AAK hydraulic cartridge
relief valves.

AAK hydraulic cartridge relief valve, the spool, buffer piston and pressure
regulating valve housing cooperate to achieve buffer overflow effect, and the
overall performance is reliable and stable, mainly from 3 unique structures:

1. The valve housing is provided with a first oil port, and the valve seat is
provided with a second oil port. The valve spool can move axially, and the
front end cooperates with the rear port of the valve seat to control the on-off
between the second oil port and the first oil port. The channel port in the
front end of the valve spool is provided with a plug, and the plug is axially
provided with a damping hole. The front end face of the valve spool is equipped
with a filter screen, and the front pressure surface of the valve spool is
larger than the rear pressure surface.

2. The inner cavity of the front end of the pressure regulating screw nut has a
buffer piston, and the rear end has a guide part. The radial bulge in the
middle forms a convex ring part. The axial opening in the front end matches
with the rear end of the valve spool. The oil supply in the middle of the
convex ring part is with the connecting channel outside the rear end.

3. The pressure regulating screw is hollow at the rear end of the valve spool
to form an inner cavity, which can move axially and change the axial force of
the spring. The inner cavity wall of the front end of the pressure regulating
screw is matched with the front end face of the convex ring to limit the buffer
piston to move forward.

For the optimized hydraulic cartridge relief valve, when the pressure at the
second oil port rises instantaneously, the valve spool opens the overflow
valve, so that the opening pressure of the valve is low, and the oil flows from
the second oil port to the first oil port and fills the valve cavity. The oil
in the inner chamber flows into the inner chamber of the buffer piston through
the damping hole. If the pressure in the inner chamber of the buffer piston
increases, the valve spool can be closed to generate secondary pressure, and
the valve spool can be opened to overflow again to realize the buffer overflow
function.

AAK hydraulic cartridge relief valve, has buffer and is easy to operate. You
can also try it!

https://www.aakindustry.com/info-detail , /cartridge-relief-valves-aak475

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