Hydraulic Pilot Operated Proportional Relief Valve No Hysteresis and Stable

Sheridan is from a hydraulic equipment company in Mexico, and has just been
employed for less than a year. The hydraulic pilot operated proportional relief
valve purchased some time ago fell him down. One of their hydraulic power units
required Sheridan to purchase a hydraulic proportional relief valve. Sheridan
worked with a hydraulic relief valve manufacturer in Ningbo who has cooperated
with their company for 4 years to make samples. The equipment debugging was
abnormal. When the rated flow was set to be large, the pressure was unstable.
Their engineer asked to optimize the hydraulic pilot operated proportional
relief valve, but the original manufacturer said that their hydraulic
proportional relief valve met the accuracy and parameter requirements of the
drawings, and had no solution to optimize the original design. Sheridan had a
big head and had to look for other hydraulic cartridge valve manufacturers, but
a week passed without success. Sheridan, a newcomer, was under great pressure.

Sheridan found AAK on Google, noticed that AAK had solved the difficult and
complicated problems of hydraulic cartridge valves, and left a message to us:
Can you optimize the hydraulic pilot operated proportional relief valve and
ensure the pressure is stable? At the sight of such messages, I guessed that he
encountered difficulties in purchasing hydraulic pilot operated proportional
relief valves. According to the original design drawing and system schematic
diagram provided by him, AAK engineers worked out a plan after 1 day. Sheridan
asked for samples, and AAK sent samples of hydraulic proportional relief valve
40 days later.

A month later, Sheridan emailed that after replacing with AAK hydraulic
proportional relief valve, the equipment was stable and had been delivered to
customers for trial use. AAK hydraulic pilot operated proportional relief valve
has stable operating pressure, small hysteresis and stable rated flow. We have
optimized the original design from 3 aspects.

1. The side of the main valve body is provided with a valve oil inlet and a
valve oil outlet, the main valve spool is installed in the main valve body, and
both ends of the main valve spool are respectively provided with damping and
fixed orifices.

2. The pilot valve seat is installed in the pilot valve body, the poppet valve
spool is arranged between the proportional electromagnet and the pilot valve
seat, and a return spring is arranged between the poppet valve spool and the
pilot valve seat.

3. A force transfer spring and a spring seat are arranged between the poppet
valve spool and the proportional electromagnet, a return spring is arranged
between the nut and the main valve spool, the proportional electromagnet is
connected with the pilot valve body and the main valve body through screws, and
the cover plate is installed at the other end of the main valve body.

When the proportional electromagnet has no current signal, the pressure oil
enters the radial small hole of the main valve spool through the valve oil
inlet, and then reaches both ends of the main valve spool. The pressure oil is
connected with the pilot valve seat through the fixed orifice. The pressure oil
can overcome the force transfer spring to push the poppet valve spool open and
enter the oil outlet of the valve. When the proportional solenoid constant
current is given, a certain thrust will be generated. The pressure oil needs to
overcome the thrust of the force transfer spring and proportional solenoid,
reduce the hysteresis, and ensure the stable operation of the hydraulic pilot
operated proportional relief valve.

AAK hydraulic pilot operated proportional relief valve, no hysteresis, and
stable, you can also try a small order!

https://www.aakindustry.com/info-det , ail/relief-valves-aak435

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