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所以使用比例阀或伺服阀的目的就是：以电控方式实现对流量的节流控制（当然经过结构上的改动也可实现压力控制等），既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作。RE25R35W4SN1XWM
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伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。 R900405544 Z2FS6-2-4X/1QJV
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也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。 D1VW020DNJGG5 D1VW020BNJCGJ5
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而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力＝t口压力＋阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
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D1VW101BNJW91派克电磁阀
D1VW102ENJDJS25派克电磁阀
D1VW102ENJDJS2591 派克电磁阀
D1VW102ENJWS2 派克电磁阀
D1VW105KNJW 派克电磁阀
D1VW105KNJW91派克电磁阀
D1VW20BNJP 派克电磁阀
D1VW20HNJGI4N4D91 派克电磁阀
D1VW20HNJWI4N4D派克电磁阀
D1VW78KNJGI4N4D91派克电磁阀
D1VW78KNJW14ND4派克电磁阀
DK-D1VW7514 派克电磁阀
D1VW001CNYGF56 派克电磁阀
D1VW001ANJW 派克电磁阀
D1VW001ANJW91X908派克电磁阀
D1VW001CNAW 派克电磁阀
D1VW001CNGW 派克电磁阀
D1VW001CNGWS3 派克电磁阀
D1VW001CNGWX651派克电磁阀
D1VW001CNJC 派克电磁阀
D1VW001CNJD派克电磁阀
D1VW001CNJDJ5派克电磁阀
D1VW001CNJDL派克电磁阀
D1VW001CNJDLJ5派克电磁阀
D1VW001CNJEEP 派克电磁阀
D1VW001CNJEEXG013 派克电磁阀
D1VW001CNJGLJ91XB756 派克电磁阀
D1VW001CNJW4D 派克电磁阀RS10R35S4SN1JWS
RS10M25S4SN9JW
RS10R17S4SN9JW
RS10M35S4SV1JW
RS10M35S4SN9JW
RS10R35S4SN1YW
RS10M07S4SN9JW
RS10M17S4SV1JW
RS10M35S4SV9JW
RS10M25S4SN1UW
RS10M07S4SN1TW
RS10M17S4SN1TW
RS10M35S1SN1JW
RS10R25S4SN1GW
RS10M17S4SN9GW
RS10M25S1SN9JW
RS10M17S4SN1GW
RS10M17S4SN1UW
RS10R25S4SN1UW
RS10M07S4SN1GW
RS10R07S4SN1GW
RS10R17S4SN1GW
RS10R35S4SN1GW
RS10M25S4SN1GW
RS10R17S4SN9GW
RS10R35S4SV9JW
RS10R35S4SNXG032
RS10R25S1SN1JW
RS10M17S4SN1JWS
RS10R35S1SN1UWS
RS10R35S4SN1UW
RS10R25S4SN1JWS
RS10R35S4SV1JW
RS10R35S4SN9JWXG041
RS10R07S4SN9KW
RS10M17S1SN9JW
RS10R25S4SN1KW
RS10R35S4SN9TW
RS10M25S1SN1YW
RS10R17S4SN1JWS
RS10M25S4SN1JWS
RS10R35L1SN1YW
RS10M35S4SN1TWS
RS10R35S4SN9YW
RS10R35S4SV9YW
RS10M35S4SN1YW
RS10M35L1SN9JW
RS10M35L4SN1UW
RS10M25S4SN9JWS
RS10R35A4SN1JW
RS10M35S1SN1YW
RS10M25S4SN9TW
RS10M35S1SN1JWS
RS10M25L4SN9JW
RS10R07S4SN1YW
RS10M25S4SN1YW
RS10R17A4SN1JW
RS25M07S4SN1JW
RS25M25S4SN1JW
RS25M35S4SN1JW
RS25M35S4SN1UW
RS25M35S4SN9JW
RS25R17S4SN1JW
RS25R25S4SN1JW
RS25R25S4SN1UW
RS25R25S4SN1YW
RS25R25S4SN9JW
RS25R35S4SN1GW
RS25R35S4SN1JW
RS25M17S4SN1JW
RS25R17S4SN9JW
