上海弘佩液压设备有限公司是一家从事经营国外进口液压气动备件、自动化仪表的贸易公司；专注于工业传动自动化流体领域。主营产品电磁阀、柱塞泵、数控模块、伺服电机、可编程控制器、传感器、气动元件、工业仪器仪表等。经营品牌有：博世力士乐rexroth、阿托斯ATOS、Parker派克、EATON VICKERS伊顿、穆格MOOG、YUKEN油研，哈威HAWE、贺德克HYDAC等进口品牌。
原装SL20PA1-4X/现货销售
单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动,或者用于气动系统中防止压缩空气逆向流动。
单向阀有直通式和直角式两种。直通式单向阀用螺纹连接安装在管路上。直角式单向阀有螺纹连接、板式连接和法兰连接三种形式。液控单向阀也称闭锁阀或保压阀，它与单向阀相同，用以防止油液反向流动。但在液压回路中需要油流反向流动时又可利用控制油压，打开单向阀，使油流在两个方向都可流动。液控单向阀采用锥形阀芯，因此密封性能好。在要求封闭油路时，可用此阀作为油路的单向锁紧而起保压作用。液控单向阀控制油的泄漏方式有内泄式和外泄式二种。在油流反向出口无背压的油路中可用内泄式；否则需用外泄式，以降低控制油压力。
原装SL20PA1-4X/现货销售
单向阀的作用
（1）普通单向阀的作用是使油液只能沿着一个方向流动,不允许反向倒流.
（2）它的用途是：安装在泵的出口,可防止系统压力冲击对泵的影响,另外,泵不工作时,可防止系统油液经泵倒流回油箱,单向阀还可用来分隔油路,防止干扰.单向阀与其他阀组合便可组成复合阀.单向阀与其他阀可组成液控复合阀
（3）对于普通液控单向阀,当控制口无控制压力时,其作用与普通单向阀一样；当控制口有控制压力时,通油口接通,油液便可在两个方向自由流动.
（4）它的主要用途是：可对液压缸进行锁闭；作立式液压缸的支承阀；起保压作用.
原装SL20PA1-4X/现货销售
单向阀是气流只能一个方向流动而不能反向流动的方向控制阀。其工作原理与液压单向阀一样。压缩空气从P口进入，克服弹簧力和摩擦力使单向阀阀口开启，压缩空气从P流至A；当P口无压缩空气时，在弹簧力和A口(腔)余气力作用下；阀口处于关闭状 态，使从A至P气流不通。单向阀应用于不允许气流反向流动的场合，如空压机向气罐充气 时，在空压机与气罐之间设置一单向阀，当空压机停止工作时，可防止气罐中的压缩空气回流 到空压机。单向阀还常与节流阀、顺序阀等组合成单向节流阀、单向顺序阀使用。
原装SL20PA1-4X/现货销售一件出众的红木家具，往往不上漆、不上蜡，就已达到完美无瑕的效果。首先在原料选材上，要识别坚实芯材。为了充分利用木料，限度降低成本，目前家具制造厂是使用白皮的，面板较薄，材料含水量过多。传统的制木工序，应先甄别坏木腐材，去除白皮白坯，精选出坚实的芯材，并通过反复干燥处理，保证木材坚固耐用与稳定性。而不少劣质的红木家具，一般是通过天然的暴晒干燥木材，有时为了赶货，一些暴晒时间不足的木材也开料使用。
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