優(yōu)勢派克溢流閥 RS10R25S4SN1JW45 伺服閥的主閥一般來說和換向閥一樣是滑閥結(jié)構(gòu)，只不過閥芯的換向不是靠電磁鐵來推動，而是靠前置級閥輸出的液壓力來推動D3W001CNAW42
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，這一點和電液換向閥比較相似，只不過電液換向閥的前置級閥是電磁換向閥，而伺服閥的前置級閥是動態(tài)特性比較好的噴嘴擋板閥或射流管閥。 D1VW002ENAW PAVC10032R46C2AP22 D46FHE01G5NB00
D1VW002ENGW PAVC10032R46C2P22 PID00A-400
D1VW002ENJDLJ5 PAVC10032R4C22 D111FSE02L2NLW0
D1VW002ENJEE PAVC10032R4MEP22 D81FHE01H2NB08
D1VW002ENJW PAVC10032R4S22 D81FSB32E1NXW0
D1VW002ENJWI5N PAVC10038R422 D1FPE50HA9NB50
D1VW002ENJWL PAVC10038R4222 D1FPE50MA9VB00
D1VW002ENJWP PAVC10038R42M22 D31FTB32CC1VF00
D1VW002ENJWS2 PAVC1003L4222 D31FTE02CC1VF00
D1VW002ENJWS3 PAVC1003R422 D91FSB11H4NXW0
D1VW002ENJWTI5N PAVC1003R4222 D91FTA32HC4NF00
D1VW002ENKW PAVC1003R42A22 D41FHE01C4NE00
D1VW002ENKWTI5N PAVC1003R4522 D81FHE01F4NE00
D1VW002ENTW PAVC1003R45C22 D1FPE55MB9NB00943
D1VW002ENYW PAVC1003R45HM22 EF96-HB2
D1VW002EVJDLJ5 PAVC1003R45P22 SK-D96FH-N35
D1VW002EVJW PAVC1003R4C22 D1FPE50BB9NS00
D1VW002KNGW PAVC1003R4SP22 D31FSE80B5NXW0
D1VW002KNGWI1N PAVC10092L4222 D1FPB60MB9NB00984
D1VW002KNJEE PAVC10092L426B122 D41FWE01FC2NXW0
D1VW002KNJW PAVC10092L42A22 D1FPE50HB9EB00
D1VW002KNJWI4N PAVC10092L42C22 D3FPE02PC9NB03
D1VW002KNJWL PAVC10092L42HM22 D1FBE01HK0NMW0
D1VW002KNJWS3 PAVC10092L46A4A22 D3FPE55YA9NB00
D1VW002KNJWTI4N PAVC10092L46B3A22
也就是說，伺服閥的主閥是靠前置級閥的輸出壓力來控制的，而前置級閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，前置級閥就不能輸出足夠的壓力來推動主閥芯動作。
而我們知道，當負載為零的時候，如果四通滑閥完全打開，D3W001CNAW42
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p口壓力＝t口壓力＋閥口壓力損失（忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力就不足以供給前置級閥來推動主閥芯，整個伺服閥就失效了。所以伺服閥的閥口做得偏小，即使在閥口全開的情況下，也要有一定的壓力損失，來維持前置級閥的正常工作。CPOM2AA25V
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伺服閥其實缺點極多：能耗浪費大、容易出故障、抗污染能力差、價格昂貴等等等等，好處只有一個：動態(tài)性能是所有液壓閥中*高的。就憑著這一個優(yōu)點，在很多對動態(tài)特性要求高的場合不得不使用伺服閥液控單向閥：用于螺紋連接（32通徑）；用于法蘭連接（從通徑40起）；
適用于在工作液壓缸上直接安裝；
可選擇帶或不帶卸載功能；
集成高壓連接。
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R901100835 SFA25G0-1X/M/01
R901163071 SFA80FT1-1X/M/01
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