DB10-1-4X/200XUW65力士樂溢流閥

DB10-1-4X/200XUW65力士樂溢流閥 德國博世力士樂REXROTH溢流閥 直動(dòng)式溢流閥 先導(dǎo)式溢流閥

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DB10-1-4X/200XUW65力士樂溢流閥

溢流閥的特點(diǎn)

先導(dǎo)閥和主閥閥芯分別處于受力平衡，其閥口都滿足壓力流量方程。閥的進(jìn)口壓力由兩次比較得到，壓力值主要由先導(dǎo)閥調(diào)壓彈簧的預(yù)壓縮量確定，主閥彈簀起復(fù)位作用。

通過先導(dǎo)閥的流量很小，是主閥額定流量的1%因此其尺寸很小，即使是高壓閥，其彈簧剛度也不大。這樣一來閥的調(diào)節(jié)性能有很大改善。

主閥芯開啟是利用液流流經(jīng)阻力孔形成的壓力差。阻力孔一般為細(xì)長(zhǎng)孔，孔徑很小0=0.8~1.2mm,孔長(zhǎng)I = 8~12mm,因此工作時(shí)易堵塞，一旦堵塞則導(dǎo)致主閥口常開無法調(diào)壓。

溢流閥遙控口接法

先導(dǎo)閥前腔有一遙控口，在該控制口接遠(yuǎn)程調(diào)壓閥可實(shí)現(xiàn)遠(yuǎn)控，接電磁閥通回油箱可實(shí)現(xiàn)卸載。

遠(yuǎn)程調(diào)壓閥實(shí)際上是一個(gè)單獨(dú)的壓力先導(dǎo)閥，旁接在先導(dǎo)型溢流閥遙控口起遠(yuǎn)程調(diào)壓作用，其調(diào)定壓力必須低于先導(dǎo)閥的調(diào)定壓力。無論哪個(gè)起作用，泵的溢流量始終經(jīng)主閥閥口回油箱。

溢流閥一般有兩種結(jié)構(gòu)：1、直動(dòng)型溢流閥 。2、先導(dǎo)式溢流閥。

對(duì)溢流閥的主要要求：調(diào)壓范圍大，調(diào)壓偏差小，壓力振擺小，動(dòng)作靈敏，過載能力大，噪聲小。

先導(dǎo)型溢流閥的導(dǎo)閥部分結(jié)構(gòu)尺寸較小，調(diào)壓彈簧不必很強(qiáng)，因此壓力調(diào)整比較輕便。但因先導(dǎo)型溢流閥要在先導(dǎo)閥和主閥都動(dòng)作后才能起控制作用，因此反應(yīng)不如直動(dòng)型溢流閥靈敏。

與三節(jié)同心結(jié)構(gòu)相比，二節(jié)同心結(jié)構(gòu)的特點(diǎn)是：①主閥芯僅與閥套和主閥座有同心度要求，免去了與閥蓋的配合，故結(jié)構(gòu)簡(jiǎn)單，加工和裝配方便。②過流面積大，在相同流量的情況下，主閥開啟高度小；或者在相同開啟高度的情況下，其通流能力大，因此，可做得體積小、重量輕。③主閥芯與閥套可以通用化，便于批量生產(chǎn)。

DB10-1-4X/200XUW65力士樂溢流閥

DB型閥是先導(dǎo)式泄壓閥。它們用于限制工作壓力。

這些閥主要由殼體（1）和帶調(diào)節(jié)類型的先導(dǎo)控制閥（2）組成。

施加在通道P上的壓力作用在主閥芯（3）上。通過噴嘴孔（4和5），壓力同時(shí)施加到提升閥（6）上。如果通道P中的壓力超過在彈簧（7）上設(shè)定的值，則提動(dòng)閥芯（6）靠著彈簧（7）打開�，F(xiàn)在，通過噴嘴孔（4和5），來自通道P的液壓流體流入彈簧腔（8）。從此處，它通過控制線（9和10）在內(nèi)部（“ –”版）或通過控制線（9和11）在外部（“ Y”版）引入儲(chǔ)罐。

由于主閥芯（3）處于平衡狀態(tài)，液壓油從通道P流向通道T，從而保持設(shè)定的工作壓力。

壓力表接口（12）可以控制工作壓力。

泄壓閥可以通過油口X（13）卸荷或切換到另一個(gè)壓力（第二額定壓力）。

 

DB10-1-4X/200XUW65力士樂溢流閥型號(hào)

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安全閥是啟閉件受外力作用下處于常閉狀態(tài)，當(dāng)設(shè)備或管道內(nèi)的介質(zhì)壓力升高超過規(guī)定值時(shí)，通過向系統(tǒng)外排放介質(zhì)來防止管道或設(shè)備內(nèi)介質(zhì)壓力超過規(guī)定數(shù)值的特殊閥門。安全閥屬于自動(dòng)閥類，主要用于鍋爐、壓力容器和管道上，控制壓力不超過規(guī)定值，對(duì)人身安全和設(shè)備運(yùn)行起重要保護(hù)作用。注安全閥必須經(jīng)過壓力試驗(yàn)才能使用。