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syi when the system pressure exceeds the set value, these spools can open automatically to release the pressure and protect the hydraulic system from damage. high reliability: excavator spool valves are usually made of high-quality materials and precision manufacturing processes to ensure that they can still maintain good performance and reliability in harsh working environments.excavator spool valves ensure that excavators are able to perform a variety of complex manoeuvres by precisely controlling the direction and flow of hydraulic fluid and regulating system pressure. manual control hydraulic valve spool excavators hydraulic spool control valves.

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