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With the hydraulic valve extended use of time, failure or failure is inevitable. Hydraulic valve failure or failure is mainly due to wear and tear caused by cavitation and other factors with the gap is too large, hydraulic valve leakage and hydraulic fluid caused by the deposition of hydraulic valve spool malfunction or clamping due. When the hydraulic valve failure or failure, most companies use the replacement of new components to restore the hydraulic system functions, the failure of the hydraulic valve has become a waste. In fact, the majority of these hydraulic valves are still in good condition and can be restored by local service. Research hydraulic valve repair is not only the significance of saving the purchase cost of components, when the failure of the hydraulic valve without spare parts or order takes a long time, and hydraulic valve equipment may therefore be shut down for a long time can be maintained through the maintenance of equipment and the entire production line operation Economic benefits are considerable. In the hydraulic valve repair practice, the commonly used repair process has a hydraulic valve cleaning, parts mix matching, repair dimensions. Hydraulic transmission system with hydraulic valves, mainly 3 brothers: Boss pressure valve, the second flow valve, the third valve. Their function is generally: A. pressure valve - control the pressure of the entire system or system, the most important of which are relief valve and pressure relief valve, the former mainly to control system pressure, and sometimes control the local pressure, sometimes as a safety valve; The latter is mainly to control the pressure of the branch lines, or to control the pressure of the oil. When you are reading, be aware of the concept that "the pressure in the hydraulic system is determined by the load" and the concept that "the system pressure is limited by the relief valve". B. Flow Valve - In the dosing pump system, to control the required flow into the control mechanism, it can not normally dry alone, need to be connected with the relief valve to help. More Keyword Search: Hydraulic Valve