Yesterday, I received a repeat order for a hydraulic sequence valve from . The first order of this hydraulic sequence valve was placed 3 years ago. Before, I wondered why this hydraulic sequence valve had not been repurchased, thinking that it had been switched back to the United States for production. I really didn't expect to receive the repeat order after 3 years, and the quantity was more than 3 times that before. 3 years ago, company had a newly designed hydraulic pump to be produced in branch, and the pump needed hydraulic sequence valve. If purchasing the hydraulic sequence valve in the , it was expected to take 3 months or more. His owner wanted to try purchasing in , hoping to save half the time. According to the owner instructions, spent 3 days looking for hydraulic valve factories, selected 5 hydraulic valve manufacturers from more than 10 as their hydraulic sequence valve suppliers, and asked them to send reference samples of hydraulic sequence valves to Vietnam for testing. happily reported the purchasing status to his owner, who was satisfied. After received these hydraulic sequence valve samples, he arranged the technical department to match the working conditions for testing, but the results were poor. The matching clearance between the valve body and the valve spool of some hydraulic sequence valves was small. After an additional 20 pressurization, the valve hole was deformed and the valve spool would be stuck. All 5 hydraulic valve manufacturers said that after additional pressurization, they were not able to ensure the quality of hydraulic sequence valve. Time has been wasted for more than 2 weeks. At this time, if returning back to the United States to purchase hydraulic sequence valves, he would be scolded by his owner. to worry. When browsed , he felt that hydraulic valve was some different from the other hydraulic valve manufacturers. He emailed to inquire about the hydraulic sequence valve and frankly told us the problems he had encountered with Chinese hydraulic valve manufacturers. After several rounds of communication and technical team analysis of his drawings, we truthfully told him that existing hydraulic sequence valve samples could not meet his pressurization test. It takes 2 weeks to proofing according to the drawing. If the sample of the hydraulic sequence valve is approved and it takes 25 30 days to produce his order for the hydraulic sequence valve, calculates the time. If the sample of hydraulic sequence valve is successful, the time saving meets the requirements of the owner. If it is not successful, it will waste another 2 weeks. It seems that he has no choice. Somehow, feels that can give him hope and hopes that we can send samples as soon as possible.