Aether is a customer of AAK in Greece and has been purchasing hydraulic cartridge valves from AAK for 3 years. At the beginning of last year, he asked me about the sealing ring options available at AAK and I felt a bit strange. I didn't provide a direct answer and take an example, if I simply asked the doctor about the medication options, the doctor would definitely need to know the patient's symptoms or cause. After further communication, it was learned that they had encountered difficulties on a hydraulic directional control valve. Due to rapid wear of the sealing ring of the hydraulic directional control valve, there was leakage and the equipment was abnormal. The original manufacturer blamed the hydraulic directional control valve for being used too frequently, resulting in wear and tear on the sealing ring, which can only be replaced with new ones. Aether cannot accept replacing the sealing ring within only 3 months.
Aether's demand is to address the issue of hydraulic directional control valve leakage without the need for frequent replacement of sealing rings. When I received the sample of the hydraulic directional control valve from the original manufacturer, I found that Aether had sent me an inquiry for this model before. I also understood why he only asked about the sealing ring at first. I told Aether that the original sealing method is a metal conical hard seal, which is difficult to ensure leakage if used frequently. Optimizing the original sealing structure can achieve no leakage for more than 1 year, but the production cost of hydraulic directional control valves would be increased. Aether was also candid and told me frankly that when inquiring, it was because AAK's price was more than 20% higher another hydraulic cartridge valve manufacturer that he chose. 60 days later, AAK sent out 50 samples of hydraulic directional control valves to address Aether's urgent needs first.
Last week, Aether informed us that AAK hydraulic directional control valve has been installed on the equipment for almost a year and there are no leaks. Their customer is very satisfied, and his boss also suggested that he make AAK their preferred supplier of hydraulic directional control valves. The production cost of AAK hydraulic directional control valve is high, which is because these 3 aspects require more money than peers. AAK hydraulic directional control valve adopts a dovetail groove sealing ring through the valve spool pressure plate, which is pressed against the step hole of the valve body along with the valve spool, playing a sealing role. Oil cannot return from the inlet chamber to the return chamber, achieving zero leakage.
1. The hydraulic directional control valve body is connected to the spring seat, and the spring is fixed between the valve spool and the spring seat. There is a clearance fit between the valve spool and the valve body, as well as between the spring seat and the valve spool, to prevent the valve spool from moving inside the valve body. The guiding effect is formed between the spring seat and the valve spool, and the pre tightening force of the spring is changed by rotating the spring seat, thereby changing the opening pressure of the valve.
2. There are step holes on the valve body that guide the valve spool. There is a dovetail groove on the valve spool, which is equipped with a sealing ring to isolate the oil inlet and return chambers. Adopting a dovetail groove sealing structure and fixed by the valve spool pressure plate, it replaces the original metal conical hard seal.
3. The control rod is installed in the control chamber of the valve body, which has several oil passage grooves that return to the oil chamber and are fixed by elastic retaining rings.
AAK hydraulic directional control valve, zero leakage, you can also give it a try!
AAK HYDRAULIC CARTRIDGE VALVES (554) 2023-04-07