7 precautions for selecting hydraulic control valves The specifications and models of various hydraulic control valves can be based on the highest pressure of the system and the actual flow rate through the valve (checked from the working condition diagram and the system diagram) and consider the control characteristics, stability, port size, and external dimensions of the valve. Choose the installation connection method, operation method, etc. from the product catalog or catalog. The considerations for the selection of various types of hydraulic control valves in the hydraulic system produced by Jinze Hydraulics are as follows: 1. The actual flow of the hydraulic valve The actual flow rate of the hydraulic valve is related to the series and parallel connection of the oil circuit: the flow rate of the series oil circuit is equal; the flow rate of the parallel oil circuit working at the same time is equal to the sum of the flow rates of each oil circuit. In addition, for a system with a single piston rod hydraulic cylinder, pay attention to the difference between the oil return flow when the piston is extended and retracted: the ratio of the flow rate of the oil returned without the rod cavity when retracted to the oil return of the rod cavity during the extension, and The ratio of the two cavity areas is equal. 2. Rated pressure and flow rate of hydraulic valve The rated pressure and rated flow of each hydraulic control valve should generally be close to their operating pressure and flow. For systems with high reliability requirements, the rated pressure of the valve should be higher than its operating pressure. If the rated pressure and rated flow are less than the use pressure and flow, it will easily cause hydraulic clamping and hydraulic power and adversely affect the working quality of the valve; for sequence valves and pressure reducing valves in the system, the passing flow should not be much less than the rated Flow, otherwise it is easy to produce vibration or other unstable phenomena. For the flow valve, attention should be paid to its minimum stable flow. 3. Installation and connection of hydraulic valve Since the installation and connection method of the valve has a decisive influence on the structural type of the hydraulic device that is subsequently designed, the integrated method of the hydraulic control device should be known when selecting the hydraulic valve. For example, a plate-type hydraulic valve is used, because the valve can be installed on the oil circuit board or block, on the one hand, it is convenient for system integration and rationalization of hydraulic device design, on the other hand, it is not necessary to disassemble the oil pipe when replacing the hydraulic valve, and installation and maintenance are more convenient; If you use a stack valve, you need to study the series spectrum of the stack valve according to the pressure and flow rate, and so on. 4. Selection of directional control valve For the ordinary check valve with simple structure, we should pay attention to the reasonable selection of its opening pressure: a lower opening pressure can reduce the resistance loss of the liquid flow through the check valve; however, for the check valve used as a back pressure valve , Its cracking pressure is high to ensure enough back pressure. For the hydraulic control check valve, in addition to the relevant precautions in this directional valve, in order to avoid causing abnormal vibration and noise of the system, it is also necessary to choose the pressure relief method reasonably: when the outlet of the hydraulic control check valve has a back When the pressure is used, the external leakage type should be selected, and the internal leakage type can be selected in other cases. For the directional valve, we should pay attention to meet the requirements of the system for automation and operating cycle, and choose its operation type from manual, mechanical, electromagnetic, electro-hydraulic and other types. Correctly select the neutral function of the spool valve to control its transitional quasi-state function. For systems that use hydraulic locks (dual-hydraulic check valves) to lock hydraulic actuators, spool-type directional valves with "H" and "Y" -shaped neutral functions should be used to make the directional valve neutral. The control chambers of the two hydraulically controlled check valves are connected to the oil tank to ensure the reliable reset of the hydraulically controlled check valve and the good locking state of the hydraulic actuator. The central position of the selected spool valve directional valve can be in the transitional transition position, and there should be no complete blockage of the oil circuit, otherwise it will cause the system instantaneous pressure to be infinite and cause accidents such as pipeline blasting. Portable waterproof travel bag, foldable waterproof luggage bag, business waterproof luggage bag, waterproof storage bag,Backpack bag Dongguan Jinying Handbags Co.,Ltd , https://www.jinyingfashionbag.com