力士乐管式单向阀S8A1.0

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一、普通单向阀

作用:使油液只能沿一个方向流动,不许反向倒流。

结构:由阀体1、阀芯2、弹簧3等零件组成。

工作原理:

P1流入，阀芯左移,通流。—一 压力损失小

P2流入,阀芯压紧在阀座上,关闭。一一密封性好

与其他阀组成复合阀,如单向节流阀、单向顺序阀、单向减压阀等。

安装在泵的出口,一方面防止压力冲击影响泵的正常工作，另一方面防止泵不工作时油液经泵回油箱。

安装在回油路上作背压阀用。需要换成刚度较大的弹簧

二、液控单向阀

结构:由控制活塞1、顶杆2、阀芯3和弹簧等组成。

作用:液控单向阀可使油液在两个方向自由通流。

工作原理:

控制口无液压油进入, A单向通B ,普通单向阀。

控制口无液压油进入, A、B互通,通路。

液压锁

左、右位:液压缸左右运动。

中位:锁紧液压缸,使其停在任意位置。

保压。

左位:缸向上退回;

右位:补油;

中位:泵卸荷,液压缸上腔压力由液控单向阀保压。

力士乐管式单向阀S8A1.0

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液压件的批量稳定生产需要企业具有多学科、全方面的技术实力和较为雄厚的资金实力。液压件为精密制造产品，生产工艺复杂、流程工序多、管理难度大，涉及材料力学、机械设计、金属材料、金属工艺学、热处理技术、自动化控制技术等多个学科，需要企业具备较高的研发测试水平、生产工艺控制和过程控制能力，才能大批量生产，并保证产品的质量稳定性。另一方面，液压产品的生产需要前期大规模的固定资产投入，特别是精密加工设备、热处理设备、高压液压件的铸件生产设备、检测设备等，且大量精密生产设备依赖进口，对企业有较高的资金要求。

液压件制造主要分为铸件生产、机械加工和装配测试三大环节：1）精密铸件的铸造工序：砂处理、制芯→造型→合箱→熔化→浇注→落砂→去冒口→抛丸→打磨→热处理→抛丸等；2）铸件、锻件、棒材的加工工序：粗机械加工→热处理→精机械加工→去毛刺→清洗→防锈等；3）使用标准件及调节元件对液压元件进行组装成品工序：清洗→装配→测试→清洗→喷涂等。

精密铸件是液压元件生产的基础和关键，每个环节均需投入大量的自动化加工设备。铸造工艺落后则无法实现合格铸件的批量生产，没有合格的铸件就没有高质量的液压件，高质量的铸件生产对设计、铸造工艺、原材料、精密加工设备提出了严苛的要求。以恒立液压为例，公司拥有全球先进的液压铸件生产工艺和完整的铸件生产线，分为熔化、造型、砂处理、制芯、清理、机加工等6个工部，每个工部均投入了大量自动化及高精度加工设备。

液压系统的组成及其作用

一个完整的液压系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件（附件）和液压油。

动力元件的作用是将原动机的机械能转换成液体的压力能，指液压系统中的油泵，它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。

执行元件(如液压缸和液压马达)的作用是将液体的压力能转换为机械能，驱动负载作直线往复运动或回转运动。

控制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。根据控制功能的不同，液压阀可分为村力控制阀、流量控制阀和方向控制阀。压力控制阀又分为益流阀(安全阀)、减压阀、顺序阀、压力继电器等；流量控制阀包括节流阀、调整阀、分流集流阀等；方向控制阀包括单向阀、液控单向阀、梭阀、换向阀等。根据控制方式不同，液压阀可分为开关式控制阀、定值控制阀和比例控制阀。

辅助元件包括油箱、滤油器、油管及管接头、密封圈、快换接头、高压球阀、胶管总成、测压接头、压力表、油位油温计等。

液压油是液压系统中传递能量的工作介质，有各种矿物油、乳化液和合成型液压油等几大类。