The original hydraulic relief valve can not solve the vibration and noise problem. AAK took over and made it different

China [CN]

Giacomo is the purchasing manager of a German hydraulic equipment company. Last year, the hydraulic lifting platform designed by his company was very creative and needed to purchase a hydraulic pilot operated relief valve. It was originally planned to be promoted on the exhibition at the beginning of the year, but the test run was not smooth. There was vibration and loud noise during the lifting process. The problem was the hydraulic relief valve. Giacomo was confused because the valve came from an old hydraulic relief valve manufacturer who had cooperated for 5 years. According to the manufacturer, this hydraulic relief valve sample was completely made based on the drawing, and the accuracy, flow, pressure and other requirements fully comply with the original design. The engineer realized that there might be a problem in the design, and asked Giacomo to contact several hydraulic relief valve manufacturers, hoping to get some constructive suggestions. It has been a month, but no progress has been made. 

Giacomo suddenly remembered that during the last communication with Gerrit of Caterpillar, Gerrit mentioned that AAK Hydraulic Valve has great design ability. With Gerrit's introduction, Giacomo told me about their current difficulties, and also sent the original drawing of the hydraulic relief valve and the video of the test run. After repeated comparison and several internal discussions, AAK technical team basically determined the cause of vibration of the hydraulic relief valve and the preliminary solution.

I told Giacomo that we are 90% sure, but AAK needs to redesign the hydraulic relief valve, which will take 6-8 weeks. Giacomo paid $2,000 for the development the next day. Six weeks later, AAK sent the newly designed hydraulic relief valve samples. A week later, Giacomo sent a video of the  machine testing. The vibration and noise were gone, and the whole machine could rise and fall freely. Their engineers disassembled AAK hydraulic relief valve, only then did they know that AAK design was brilliant and had a sigh of "so it is".

AAK adds parts to the resonant cavity of the hydraulic pilot operated relief valve, which reduces the volume of the resonant cavity and increases the stiffness of the oil under negative pressure. According to the principle that the components with high stiffness are not easy to resonate, we have adjusted the internal design of the hydraulic relief valve, added a vibration damping sleeve and a vibration damping pad to the pilot valve, and set various damping holes on the vibration damping sleeve to increase damping to eliminate vibration. The vibration damping pad can cooperate with the resonant cavity and move freely. There is a throttling groove on the front and back of the vibration damping pad, and the oil can also produce damping effect when flowing to change the original flow.

Giacomo privately informed that after the successful test run, the whole team was very happy and their engineers admired him more and more.

AAK hydraulic pilot operated relief valve, no vibration, no noise, you can also have a small try!

https://www.aakindustry.com/info-detail/hydraulic-relief-valve-aak261