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充液阀是一种特殊的液控单向阀，一个方向止流，另一个方向自由流通，先导动作是由油口供压的控制阀芯用液压实现的，由此而直接打开主阀。这种阀为叠加系统而设计，即在一个基础件上，可以叠加各种各样的其它类别液压阀。其主要作用是从油箱（或充液油箱）向液压缸或者系统补充油液，以免出现吸空现象。带控制的充液阀还能起快速排油的作用。
2.2充液阀的典型结构
充液阀有常闭式和常开式两种典型结构。
(1)常闭式充液阀
常闭式充液阀有不可控式和可控式两种形式，不可控式充液阀，它是由阀芯、导向套、复位弹簧、阀体和连接法兰等主要零件组成。阀芯是蘑菇形的，结构较紧凑，流阻损失小；阀芯重量轻惯性小，动作灵敏。
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对于可控式充液阀。控制油通入控制缸的上腔，控制活塞就可使阀芯开启。控制缸上腔接油箱时，控制活塞在弹簧的作用下复位。控制缸下腔与充液油箱是想通的。这两种结构的充液阀都直接安装在液压缸的端部，
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安装方便，节省了与工作液压缸连接的管道。浸入式结构，即上部全浸在充液油箱中，结构很紧凑，流阻损失很小。但充液油箱必须安装在液压缸的底部，还要解决充液油箱与液压缸缸底之间的密封问题。检修不太方便。管道连接式结构，即通过管道和法兰与充液油箱相连，与浸入式相比，充液油箱的位置布置较灵活，检修也较方便，但结构显得庞大，流阻损失也稍大。
(2)常开式充液阀
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常开式充液阀的优点在于充液过程中不需要克服弹簧力，从而减少了吸油阻力。但结构较复杂，制造要求也较高。
常开式充液阀。阀芯在弹簧的作用下停在阀上部，充液阀处于开启状态。当转入工作行程时，先在充液阀的控制口通入压力油，阀芯下行，充液阀关闭。由于阀芯上部面积略大于其下部面积，
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故随着液压缸油压的升高，充液阀越关越紧。当活塞回程时，液压缸先行卸压，且充液阀的控制口与油箱相通，充液阀可自动开启，使液压缸中的油液大量排回充液油箱
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VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VSPA2-1-2X/V0/T1
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT-VRPA2-1-1X/VO/T1力士乐VT-VRPA2-1-1X/VO/T1力士乐
VT11034-1X
VT5035-1X
VT5041-2X/1
VT5041-2X/3
VT11025
VT11024
VT11006-1X/
VT3024-3X
VT3002-2X/32D
VT11131-1X/
VT11132-1X/
VT11165-1X/
VT2000-5X/
VT11012-1X
VT-HNC100-1-23/W-08-P-0
VT-PVAR2-1X/2
VT-SR35
VT-VRPA1-151-1X/V/0/0
VT10468-3X/BO-RX
VT11015-1X/
VT12302-2X/
VT-VRPA2-527-1X/V0/RTS
VT-VRPA2-537-1X/V0/RTS
VT-VRPA1-527-1X/V0/QV
VT-VRRA1-527-2X/V0
VT-VETSY-1-1X/1-2-1-1-1/
VT-SR1-1X/0
VT-SR2-1X/0-60
VT-SR7-1X/0/VT5005-1X/
VT11010-1X/
VT11073-1X
VT11031-1X/
VT11030-1X
VT11078-2X
VT11004-1X/
VT11013-1X
VT11021-1X/
VT11007-1X/
VT11016-1X/
VT-SR41-1X/1/2
VT-VSPD-1-2X/V0/0-0-1
VT11005-1X/
VT11032-1X/
VT11033-1X/
VT11037-1X/
VT5007-1X/
VT11550-2X/
VT16000-3X
VT13477-2X/3
VT11554-2X/
VT12323-2X/
VT11023-1X
VT-MRPA2-2-1X/V0/0
VT11008-1X
VT-MRPA2-1-1X
VT-MSPA1-50-1X
VT-MSPA1-1-1X/V0/
VT-MACAS-500-10/VO/I
VT-MSPA1-50-1X/V001
VT-SWMA-1-1X/VO/O
VT-TRPD-2-1X/V0/0
VT11018-1X
VT12304-2X/
VT-HACDB-1-1X/V0/1-0-0
VT5008-1X/
VT13000-1X/
VT-VRPA1-51-1X
VT5013-3X/R5E
VT5014-3X/R1E
VT12321-2X
VT5014-3X/R5E
VT5015-3X/R5E
VT1610-3X/
VT12270-1X/
VT1516-1X/
VT12427-1X/
