優(yōu)勢(shì)派克傳感器SCP01-400-34-06

武穴黎翔機(jī)電設(shè)備有限公司，詢價(jià)聯(lián)系人：何女士

詢價(jià)，

詢價(jià)

詢價(jià)QQ: 736567721,704552157

現(xiàn)貨特價(jià)型號(hào)：4WEH16E7X/6HG24N9ETK4/B10 2臺(tái)

伺服閥的主閥一般來(lái)說(shuō)和換向閥一樣是滑閥結(jié)構(gòu)，只不過(guò)閥芯的換向不是靠電磁鐵來(lái)推動(dòng)，而是靠前置級(jí)閥輸出的液壓力來(lái)推動(dòng)，這一點(diǎn)和電液換向閥比較相似，只不過(guò)電液換向閥的前置級(jí)閥是電磁換向閥，而伺服閥的前置級(jí)閥是動(dòng)態(tài)特性比較好的噴嘴擋板閥或射流管閥。

也就是說(shuō)，伺服閥的主閥是靠前置級(jí)閥的輸出壓力來(lái)控制的，而前置級(jí)閥的壓力則來(lái)自于伺服閥的入口p，假如p口的壓力不足，前置級(jí)閥就不能輸出足夠的壓力來(lái)推動(dòng)主閥芯動(dòng)作。

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而我們知道，當(dāng)負(fù)載為零的時(shí)候，如果四通滑閥完全打開(kāi)，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(jí)閥來(lái)推動(dòng)主閥芯，整個(gè)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(kāi)的情況下，也要有一定的壓力損失，來(lái)維持前置級(jí)閥的正常工作。

伺服閥其實(shí)缺點(diǎn)極多：能耗浪費(fèi)大

TDA050EW09A2NXW23

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00C

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KDG4V32C20NZMU1H760 現(xiàn)貨

DIFVE02BCVXW

CVU 32 EFP1 B29 70 31 現(xiàn)貨

KDG5V-7-33C170N-EX-VM-U-H1-10

DGMFN-3-Y-A2W-B2W-41

0811 404 141 現(xiàn)貨

派克恒壓變量泵PD100PS02SRS5AL00T00C

PARKER恒壓變量泵PD100PS02SRS5AC00S1000000

DAC287E32LAF

DSAEV207P04ELAF

TEA050EW09B2NLWJ22

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4D01.3111.0201.C1W31，026-35129-S

4D01.3151.0201. C1W31，026-36856-S

PVP2336C9R21

PVP3336R2H21

PVP48369R2H11

D3FXE01HCNBJ00現(xiàn)貨特價(jià)1臺(tái)促銷(xiāo)

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、容易出故障、抗污染能力差、價(jià)格昂貴等等等等，好處只有一個(gè)：動(dòng)態(tài)性能是所有液壓閥中的。就憑著這一個(gè)優(yōu)點(diǎn)，在很多對(duì)動(dòng)態(tài)特性要求高的場(chǎng)合不得不使用伺服閥，如飛機(jī)火箭的舵機(jī)控制、汽輪機(jī)調(diào)速等等。動(dòng)態(tài)要求低一點(diǎn)的，基本上都是比例閥的天下了。

一般說(shuō)來(lái)，好像伺服系統(tǒng)都是閉環(huán)控制，

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