4WRA6V30-22/G24N9K4/V-589伺服比例閥

4WRA6V30-22/G24N9K4/V-589伺服比例閥由于電磁鐵推力的限制，在大于63L/min的液壓系統中，一般不再選用直推式的電磁換向閥，而選用通過流量較大的電液換向閥。電液換向閥的原理是：控制油通過電磁先導閥到達電液閥主閥芯的兩端（即電液換向閥主閥體兩端蓋側），通過電磁先導閥的換向4wreem6e1-32-20/g24k34/b6v R901037662 
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R900931195 4WREE 6 V1-16-2X/G24K31/A1V

R901354786 4WREE 10 W1-75-2X/G24K31/F1M

R901354788 4WREE 10 W50-2X/G24K31/F1M

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R900912150 4WREE 6 Q2-16-2X/G24K31/A1V

R901245852 4WREQ 10 Q5-50-2X/V8C-24PA60

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R900975521 4WREE 6 E32-2X/G24K31/A1V=LB

R901068955 4WREE 6 V16-2X/G24K31/A1V-826

R900246618 4WREEM 6 E16-2X/G24K34/B6V

R900246793 4WREE 6 W32-2X/G24K31/F1V

R901059709 4WREQ 6 Q5-32-2X/V8C-24CA60

R901060222 4WREE 10 V75-2X/G24K31/A1V-826

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R900709937 4WREE 6 V1-32-2X/G24K31/F1V

R900953729 4WRE 6 W1-08-2X/G24K4/V
，來實現主閥芯的左右移動，從而開通或切斷通往執行元件的油路，使執行元件運行或停止。但在打開或切斷油路的瞬間，系統中會產生相當大的沖擊，這種沖擊會極大影響液壓系統中液壓元件和密封件的使用壽命。為了減小及至消除由此引起的液壓沖擊
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4WRAE6E26-2X/G24K31F1 R900021267

4WRDE25V1-350L-5x/6L24K9/M

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4WRDE27W500L-5XH/6L24K9/M

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，*簡單的辦法是在該電液閥下面疊加一個P口節流閥或進油節流式雙單向節流閥、出油節流式雙單向節流閥，以延長閥芯的換向及復位時間，從而到降低液壓沖擊的目的。下面就以彈簧復位型、三位四通中封式電液壓換向閥為例、對該三種疊加節流方式作簡要說明。DRE10-5X/200YG24K4M
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