AAK solved the pressure control problem of Hydraulic Needle Valve with 3 steps,

Karl is from Sweden. He purchases the standard parts of hydraulic cartridge valves from Italy, and the customized parts of hydraulic cartridge valves from Ningbo. Some time ago, when they developed hydraulic drilling equipment, they needed to customize the hydraulic cartridge needle valve. He made samples in a hydraulic cartridge valve manufacturer in Ningbo. Due to the unstable pressure control of the hydraulic cartridge needle valve, the selling point of the new hydraulic drilling cannot be realized. The Italian hydraulic cartridge valve manufacturer has no time to customize. The engineer pushed, and Karl was very anxious.

This Ningbo manufacturer contacted me and hoped that AAK would develop this hydraulic cartridge needle valve. I said: I have no interest to develop for my peers. If you are really in a hurry, let the customer contact AAK directly. The next day, I received an email from Karl. According to the schematic diagram of the hydraulic system provided by him and the anatomical sample of the original hydraulic cartridge needle valve, as long as the pressure balance within the valve is solved and the most suitable flow area is found, this hydraulic cartridge needle valve can achieve fine pressure control.

After 60 days, AAK sent 10 samples of hydraulic cartridge needle valves. Yesterday, Karl emailed us to inform that the equipment was smoothly debugged. Their engineers admired AAK's idea for the precise pressure control of the hydraulic cartridge needle valve. AAK hydraulic cartridge needle valve has an appropriate flow area between the valve spool and the valve seat, which reduces the back pressure when the hydraulic cartridge needle valve has a large displacement, and the through-hole of the valve spool achieves pressure balance up and down the valve spool.

1. The lower part of the valve rod of the hydraulic cartridge needle valve is connected to the valve spool, and the upper part of the valve body has an axially machined orifice in which an anti rotation cylinder can be inserted. A circumferential lock is formed between the anti rotation cylinder and the valve body.

2. The spool of the hydraulic cartridge needle valve is inserted into the anti rotation cylinder and forms a circumferential lock between the cartridge and the anti rotation cylinder, with an axial sealing and sliding fit. There are oil inlet and outlet channels on the side and lower axial directions of the valve body, respectively. At the same time, a through-hole is provided on the valve spool to achieve pressure balance up and down the valve spool.