比例閥節制后輪管路壓力的工作點與汽車的載荷無關這就是非感載比例閥。若要使其工作點與汽車載荷的大小相適應就必須能改變彈簧力的大小這就是感載比例閥。 
比例電磁閥工作原理
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 軸向變量柱塞泵V30D-095RKN-2-1-03/LN 
軸向變量柱塞泵V30D-140RKN-1-1-04/  
軸向變量柱塞泵V30D-140RKN-2-1-04LN400-285KW320BAR 
軸向變量柱塞泵V30D-250RDN-1-1-N
軸向變量柱塞泵V30D-250RDN-2-1-05  
軸向變量柱塞泵V60N-090RDUN-1-0-03/LSN-220
軸向變量柱塞泵V60N-090RDN-1-0-02/LLSN-300
軸向變量柱塞泵V60N-090LDUN-1-0-03/LSN-2- 
軸向變量柱塞泵V60N-110RSUN-2-0-03/LSN  
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換向閥WG21-1-WG230 bucher QX42-032R
bucher DWPAU-2-10-SN15
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bucher RVSAE3/6DS-112-2-02
bucher WS22GNCB-10-V-1-24VDC
bucher QX32-012/32-012R
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bucher AP100/4，3D318
bucher RVSAE3/6-21-01
換向閥WG22-1-WG230 
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截止式換向閥WH1D