上海韋米機電設備有限公司

SL20PA1-42液控單向閥 德國博世力士樂REXROTH液壓閥 液控單向閥 電磁閥

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SL20PA1-42液控單向閥

單向閥 Check Valve 

單向閥又稱止回閥或逆止閥。用于液壓系統(tǒng)中防止油流反向流動,或者用于氣動系統(tǒng)中防止壓縮空氣逆向流動。

單向閥有直通式和直角式兩種。直通式單向閥用螺紋連接安裝在管路上。直角式單向閥有螺紋連接、板式連接和法蘭連接三種形式。液控單向閥也稱閉鎖閥或保壓閥，它與單向閥相同，用以防止油液反向流動。但在液壓回路中需要油流反向流動時又可利用控制油壓，打開單向閥，使油流在兩個方向都可流動。液控單向閥采用錐形閥芯，因此密封性能好。在要求封閉油路時，可用此閥作為油路的單向鎖緊而起保壓作用。液控單向閥控制油的泄漏方式有內(nèi)泄式和外泄式二種。在油流反向出口無背壓的油路中可用內(nèi)泄式；否則需用外泄式，以降低控制油壓力。

注意事項。

(1)必須保證液控單向閥有足夠的控制壓力，較好不允許控制壓力失壓。應注意控制壓力是否滿足反向開啟的要求。如果液控單向閥的控制引自主系統(tǒng)時，則要分析主系統(tǒng)壓力的變化對控制油路壓力的影響，以免出現(xiàn)液控單向閥的誤動作。

(2)根據(jù)液控單向閥在液壓系統(tǒng)中的位置或反向出油腔后的液流阻力（背壓）大小，合理選擇液控單向閥的結構（簡式或復式）及泄油方式（內(nèi)泄或外泄）。對于內(nèi)泄式液控單向閥來說，當反向油出口壓力超過一定值時，液控部分將失去控制作用，故內(nèi)泄式液控單向閥一般用于反向出油腔無背壓或背壓較小的場合；而外泄式液控單向閥可用于反向出油腔背壓較高的場合，以降低較小的控制壓力，節(jié)省控制功率。系統(tǒng)若采用內(nèi)卸式，則柱塞缸將斷續(xù)下降發(fā)出振動和噪聲。

SL20PA1-42液控單向閥

型號SV和SL閥是錐閥結構的液控單向閥，它可在關閉方向開啟而讓油液自由流動。

此類閥用于有液壓回路部分的隔離，當管路破裂時，作為防止負載失壓的安全措施，或避免執(zhí)行器在液壓閉鎖時的爬行或漂移。

其組成主要包括閥體、閥芯 、壓縮彈簧和控制活塞和一個可選的釋壓球閥。

型號SV...

油液可以由A至B自由流動。在相反方向，閥芯被壓縮彈簧和系統(tǒng)壓力牢固的保持在其閥座上。

通過向控制口X提供壓力，控制活塞被推向右側。這樣閥芯離開閥座，油液由B至A流動。

為了確保閥開啟，需要一定的低控制壓力作用于控制活塞上

為了確保通過施加到控制閥芯上壓力閥能打開，要求一定的小先導壓力

型號SV..A..和SL..A.. (帶卸壓功能，)

該閥有一個附加的印載機構，當向X口提供控制壓力時，控制活塞被推向右側。它首先推開球閥芯，然后主閥芯離開其閥座。這樣，油液從B流向A,從而避免可能的壓力沖擊。

由于這種預開啟特征，可以實現(xiàn)缸中受壓液體的平穩(wěn)釋壓。

型號SL..

此閥的功能與SV型相同。

不同之處在于增加了泄油口Y。此處控制活塞 的環(huán)形面積與A口隔離。來自A口的壓力只作用于控制活塞 的面積A_上。

SL20PA1-42液控單向閥型號

液控單向閥常見型號

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R988002174 SV10PA1-4X/

電磁線圈是通電產(chǎn)生電磁的一種裝置。在鐵芯的外部纏繞與其功率相匹配的導電繞組，這種通有電流的線圈像磁鐵一樣具有磁性，它也叫做電磁鐵（electromagnet）。我們通常把它制成條形或蹄形狀，以使鐵芯更加容易磁化。另外，為了使電磁鐵斷電立即消磁，我們往往采用消磁較快的的軟鐵或硅鋼材料來制做。這樣的電磁鐵在通電時有磁性，斷電后磁就隨之消失。

力士樂液控單向閥SV 10...32

R900483368 DGA1-4X/

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R900426680 SV10GA1-4X//5

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力士樂REXROTH液控單向閥SL 6

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R900207273 SL10PA1-4X/JV

R900537478 SL10PA1-4X/SO96

R900459576 SL10PA1-4X/SO113

R900440205 SL10PA1-4X/SO149

R900508232 SL10PA1-4X/SO251

R900586402 SL10PA1-4X/SO280

R900434337 SL10PA1-4X/SO67

R900079747 SL10PA1-4X/SO97

R900457388 SL10PA1-4X/V

R900425580 SL10PA1-4X/VSO113

R901402148 SL10PA1-4X/VJ50

R901406522 SL10PA1-4X=VJ50

R900442260 SL10PA2-4X/

R901031296 SL10PA2-4X/SO96

R900599830 SL10PA2-4X/SO251

R900586396 SL10PA2-4X/V

R900443418 SL10PA3-4X/

R901341937 SL10PA3-4X/J50

R900504957 SL10PA3-4X/V

R901429658 SL10PA3-4X/VJ3

R900419510 SL10PA4-4X/

R900020963 SL10PA4-4X/J

R901141208 SL10PA4-4X/JV

R900403579 SL10PA4-4X/V

R901430215 SL10PA4-4X/VJ3

R900443419 SL10PB1-4X/

R900058130 SL10PB1-4X/SO313

R900403795 SL10PB1-4X/J

R900532365 SL10PB1-4X/SO257

R900449987 SL10PB1-4X/SO96

R900079790 SL10PB1-4X/SO97

R900481121 SL10PB1-4X/SO97

R900406641 SL10PB1-4X/V

R900457386 SL10PB2-4X/

R900514645 SL10PB2-4X/V

R900438637 SL10PB3-4X/

R901426805 SL10PB3-4X/QMG24

R901426828 SL10PB3-4X/QMG24V

R901121247 SL10PB3-4X/V

R901430220 SL10PB3-4X/VJ3

R901301264 SL10PB3-4X/VJ50

R900451335 SL10PB4-4X/

R900527575 SL10PB4-4X/V

R983040138 SL10GA1-4XIN010

R983040139 SL10GA2-4XIN010

R983040140 SL10GA3-4X/IN010

R983040141 SL10GB1-4XIN010

R983040142 SL10GB24XIN010

R983040143 SL10GB3-4XIN010

R983040144 SL10GB4-4X/IN010

R983040145 SL10PA1-4XIN010

R983040146 SL10PA1-4X/VIN010

R983040147 SL10PA2-4XIN010

R983040148 SL10PA2-4X/VIN010

R983040149 SL10PA3-4XIN010

R983040150 SL10PA4-4XIN010

R983040151 SL10PB1-4XIN010

R983040152 SL10PB1-4X/VIN010

R983040153 SL10PB2-4XIN010

R983040154 SL10PB3-4XIN010

R983030717 SL10PB4-4X/IN010

R983030717 SL10PB4-4X/IN010

R978014265 SL10GA2-4X/V/12

R978878966 SL10GB2-4X/12

閥門的控制可采用多種傳動方式， 如手動、電動、液動、氣動、渦輪、電磁動、電磁液動、電液動、氣液動、正齒輪、傘齒輪驅動等；可以在壓力、溫度或其它形式傳感信號的作用下， 按預定的要求動作，或者不依賴傳感信號而進行簡單的開啟或關閉，閥門依靠驅動或自動機構使啟閉件作升降、滑移、旋擺或回轉運動， 從而改變其流道面積的大小以實現(xiàn)其控制功能。