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力士乐单向阀是流体只能沿进口流动，出口介质却无法回流的装置。REXROTH力士乐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。

力士乐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。

力士乐单向阀*型号
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R900950210 Z2S6-4-6X/
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R900434782 Z2S6B3-6X/SO60
R900398588 Z2S6-1-6X/JVSO25
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R900347505 Z2S6-2-6X/V
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R900516212 Z2S10A4-3X/
R900510210 Z2S10A3-3X/SO30
R900507126 Z2S10A1-3X/VSO40
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R900963530 Z2S10-1-3X/SO67
R900930378 Z2S10A4-3X/SO60
R900905864 Z2S10-2-3X/VSO30
R900902400 Z2S10B1-3X/SO51
R900722704 Z2S10B3-3X/VSO30
R900709152 Z2S10A1-3X/SO73
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R900437275 Z2S10A2-3X/SO40
R900437010 Z2S10A3-3X/
R900436812 Z2S10A2-3X/V
R900436801 Z2S10-2-3X/V
R900436800 Z2S10B3-3X/
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R900434799 Z2S10-2-3X/SO30
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R900431003 Z2S10-3-3X/
R900429599 Z2S10-1-3X/SO14
R900428795 Z2S10B2-3X/V
R900421985 Z2S10-2-3X/
R900420049 Z2S10-4-3X/
R900407465 Z2S10B1-3X/V
R900407440 Z2S10A1-3X/V
R900407439 Z2S10-1-3X/V
R900407434 Z2S10B1-3X/
R900407394 Z2S10-1-3X/

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