| Message: | Sal is from Italy. He has been buying hydraulic cartridge valves in China for quite a long time and is very knowledgeable. At the beginning of this year, they developed a new hydraulic press for sheet stretching, which uses hydraulic needle valves. Considering the exhibition time, Sal directly purchased 50 standard hydraulic needle valves of HydraForce, and the trial run was successful, and the reservation volume at the exhibition was also good. The boss asked Sal to try to purchase hydraulic needle valves in China instead of HydraForce. He contacted several hydraulic needle valve suppliers, but they were not 100% confident about the internal leakage of 0.3cc/min. Sal selected 2 hydraulic needle valve manufacturers with the most trust and quality.
4 weeks later, the hydraulic needle valves were installed with the equipment. After a period of operation, the working pressure of the hydraulic press could not be increased, resulting in the plate could not be stretched. The engineer found that the hydraulic needle valve was abnormal, and there were leakage traces at the fitting gap between the valve spool and the valve body. After testing the hydraulic needle valve separately, the internal leakage was 0.5cc/min, while the hydraulic needle valve at 0.3cc/min did not have any leakage traces, that is, the hydraulic needle valves from those 2 hydraulic valve manufacturers have unstable internal leakage accuracy. Sal suggested still purchasing HydraForce standard parts, but the boss was not satisfied and asked Sal to try again. At this time, Sal was a little worried.
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