阀门（Valve）是控制流动的流体介质的流量、流向、压力、温度等的机械装置，阀门是管道系统中基本的部件。阀门管件在技术上与泵一样，常常作为一个单独的类别进行讨论。阀门可用手动或者手轮，手柄或踏板操作，也可以通过控制来改变流体介质的压力，温度和流量变化。阀门可以对这些变化进行连续或重复的操作，比如在热水系统或蒸汽锅炉安装的安全阀。在更复杂的控制系统根据外部输入（即调节流经管道不断变化的设置点）的需要采用自动控制阀门。自动控制阀门不需人工操作根据其输入和设置，使阀门准确控制流体介质的各项要求。阀门根据材质还分为铸铁阀门，铸钢阀门，不锈钢阀门，铬钼钢阀门，铬钼钒钢阀门，双相钢阀门，塑料阀门，非标订制等阀门材质。
装配要求
清洗干净的部件必须密封保存，以供安装。对安装过程要求如下：
1、安装车间必须保证洁净，或者搭建临时的洁净区域，例如用新购的彩条布或者塑料薄膜等，防止在安装过程中有灰尘进入。
2、装配工人必须身着洁净的纯棉工作服，头戴纯棉帽，头发不能外漏，脚穿干净鞋子，手戴塑胶手套，脱脂、。
3、装配用工具必须在装配前进行脱脂清洗，保证洁净。
单向阀
液动换向阀
手动换向阀
三位五通换向阀
三位四通换向阀
二位四通换向阀
二位二通换向阀
溢流阀
减压阀
200P型减压阀
顺序阀
节流阀
调速阀
机械手伸缩伺服机构
电动遥控阀
插装阀
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晁和爽2345电磁阀(五孔三位是什么意思?) -
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晁和爽2345帮我识别一下这张图上的液压元件符号 -
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