One morning in the first half of this year, shortly after Sam arrived at the company, the boss asked him to come to his office. He realized whether there was a complaint about the hydraulic valve. He saw that the technical director was also in the boss's office. It turned out that the hydraulic check valve installed on the hydraulic pump had leakage in different proportions. These hydraulic pumps were due to ship in 20 days. The boss asked him to purchase the qualified hydraulic check valve in 40 days, because their customer only gave the company a 4-week extension.
The technical director informed that according to the on-site detection, about 20% of the hydraulic check valves had leakage. After dissection, it was found that the gap between the valve body hole and the valve spool of these leaking hydraulic check valves was uneven, and some even exceeded 40μm. The gap dimensions are quite different. Sam immediately contacted the original hydraulic valve manufacturer and asked him to replenish 30% to replace those unqualified hydraulic check valves, but he was rejected. Per the original hydraulic valve manufacturer, these hydraulic check valves passed the inspection before delivery and the leaked hydraulic check valves were caused by their improper installation. In the end, the manufacturer didn't even reply to his email. Sam was angry and had to find a new supplier of hydraulic check valve.
Sam found AAK HYDRAULIC VALVE in Google and browsed AAK website (www.aakindustry.com), which made him see the dawn and feel that AAK hydraulic valve is different. He emailed us inquiry about the hydraulic check valve and truthfully informed us of the problems he encountered with the Chinese hydraulic valve manufacturer. After several rounds of e-mail communication and integrating the drawings and operating conditions provided by Sam, AAK promised him to offer qualified hydraulic check valve samples within 14 days. If the samples are qualified, the 30% of quantity that he needs can be delivered in 4 weeks.
After 14 days, Sam received the hydraulic check valve samples. There was no leakage after installation and commissioning, and the gap between the valve body hole and the valve spool of each hydraulic check valve could be stable within a range and uniform in size. The technical department told him that the standard deviation (sigma) accuracy of the clearance dimension of AAK hydraulic check valve was more than 3 times higher than that of the original supplier. Sam was surprised how AAK hydraulic valve was different?
The whole line of production equipment of AAK hydraulic valve is a high-precision machine tool and processing center imported from Switzerland. The core materials are imported from Germany and South Korea, ensuring the production accuracy of valve body and valve spool. The valve spool diameter of this hydraulic check valve is greater than 20mm, and the gap between the valve body and the valve spool needs to be 15μm-25μm, which is an industry requirement, but AAK uses 15μm-20μm as the hard index for production, which is 25% higher than the industry standard. Before each batch of production, the accuracy of each axis of the machine tool needs to be tested, including positioning accuracy, repeated positioning accuracy and reverse positioning accuracy. After obtaining the test data, the accuracy can be compensated. Most hydraulic valve manufacturers ignore this link. That is why the gap dimension standard deviation (sigma) accuracy of AAK is more than twice that of Sam's old hydraulic valve supplier.
AAK completed 30% quantity of hydraulic check valves on schedule. Sam solved the unsuccessful procurement without danger. The boss praised him for completing the procurement on schedule and suggested him to find more hydraulic valve suppliers like AAK.
AAK hydraulic check valve has guaranteed quality and after-sales service. Our quality benchmarked with international first-line brands. You can also give it a try.
AAK HYDRAULIC VALVE (123) 2021-12-22