Hudson is an old purchaser of LARZEP company in Spain. He cooperates with us on are some non-standard hydraulic sequence valves, and often discuss some difficult and miscellaneous problems of hydraulic sequence valves with us. In the second half of last year, their company developed a machine tool hydraulic system, which uses the hydraulic sequence valves to implement the device of positioning first and then clamping. In order to save development time, Hudson purchased directly from Spanish hydraulic sequence valve manufacturers. According to the hydraulic sequence valve drawings provided by Hudson, the factory delivered 20 hydraulic sequence valve samples in 30 days. After the test run, it was found that the positioning clamping device reacted slowly after the machine tool was started. Check the oil circuit and components of the whole hydraulic system one by one, and there is no abnormality. Their engineers speculated that there was a problem with the hydraulic sequence valves.
Hudson contacted the original factory. The manufacturer fed back that the samples of hydraulic sequence valves were completely produced according to the drawings provided by LARZEP company, and the dimensional accuracy met the requirements. Their engineers tested the hydraulic sequence valves separately and there was no abnormality. Hudson's team explored for 2 days and determined that there was a problem with the design of the hydraulic sequence valves. Hudson contacted AAK because the hydraulic sequence valve problems encountered several times before were solved by AAK. According to his fault description, drawings of hydraulic sequence valve, working parameters of hydraulic system of machine tool and video of test run, AAK engineer did find the problem in the design of hydraulic sequence valve.
AAK engineer's suggestion is to change the design mode of the hydraulic sequence valve to maintain a minimum "pilot pressure" in the starting circuit and "fully open" when it is higher than the set pressure. This feature can effectively reduce the throttling loss of the system under the working pressure and make the clamping and positioning system of the machine tool sensitive. Hudson team had to stop the machine test and let AAK immediately test the sample according to AAK design recommendations.
After 30 days, AAK sent 20 hydraulic sequence valve samples and provided our working schematic diagram. Hudson team installed and commissioned the machine tool after receiving it, and the machine tool was continuously tested for 48H. The reaction of the positioning and clamping device of the machine tool has always been normal. Hudson emailed us that AAK newly designed hydraulic sequence valve was more reliable than their native Spanish ones, and their engineers were surprised by AAK design ability. Thanks to the help of AAK, they succeeded in the test run.
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