力士樂(lè)溢流閥DBW20B1-5X/315-EW230N9K4現(xiàn)貨                                          力士樂(lè)溢流閥由德國(guó)力士樂(lè)公司原裝支持，力士樂(lè)電磁閥在各大工業(yè)項(xiàng)目中都扮演著*的作用，合同類(lèi)型產(chǎn)品相比，優(yōu)勢(shì)顯著。                                                                                      DB和DBW類(lèi)型閥是插裝結(jié)構(gòu)先導(dǎo)式溢流閥 ，它們用于限制系統(tǒng)壓力（DB）或限制和 電磁卸載（DBW只帶螺紋連接）系統(tǒng)壓力。 該閥組主要包括閥體和溢流閥插裝元件。管路中的壓力作用于閥芯上，并經(jīng)過(guò)節(jié)流孔同時(shí)作用于球閥芯。當(dāng)管路中的壓力超過(guò)彈簧設(shè)定的壓力值時(shí)，球閥芯克服彈簧力開(kāi)啟。此時(shí)來(lái)自油口的油液經(jīng)節(jié)流孔流入彈簧腔，并通過(guò)控制通道由外部引回油箱。由于在閥芯高壓流體流動(dòng)的平衡狀態(tài)，油液經(jīng)A口流向B口，同時(shí)保持設(shè)定的工作壓力不變。DBW 型溢流閥（僅螺紋連接型）原則上功能與DB型相同。借助頂裝方向閥可控制主閥卸荷。                                  溢流閥是一種液壓壓力控制閥。在液壓設(shè)備中主要起定壓溢流作用，穩(wěn)壓，系統(tǒng)卸荷和安全保護(hù)作用。 定壓溢流作用：在定量泵節(jié)流調(diào)節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當(dāng)系統(tǒng)壓力增大時(shí)，會(huì)使流量需求減小。此時(shí)溢流閥開(kāi)啟，使多余流量溢回油箱，保證溢流閥進(jìn)口壓力，即泵出口壓力恒定（閥口常隨壓力波動(dòng)開(kāi)啟）。
穩(wěn)壓作用：溢流閥串聯(lián)在回油路上，溢流閥產(chǎn)生背壓運(yùn)動(dòng)部件平穩(wěn)性增加。
系統(tǒng)卸荷作用：在溢流閥的遙控口串接溢小流量的電磁閥，當(dāng)電磁鐵通電時(shí)，溢流閥的遙控口通油箱，此時(shí)液壓泵卸荷。溢流閥此時(shí)作為卸荷閥使用。
安全保護(hù)作用：系統(tǒng)正常工作時(shí)，閥門(mén)關(guān)閉。只有負(fù)載超過(guò)規(guī)定的極限（系統(tǒng)壓力超過(guò)調(diào)定壓力）時(shí)開(kāi)啟溢流，進(jìn)行過(guò)載保護(hù)，使系統(tǒng)壓力不再增加
實(shí)際應(yīng)用中一般有：作卸荷閥用，作遠(yuǎn)程調(diào)壓閥，作高低壓多級(jí)控制閥，作順序閥，用于產(chǎn)生背壓（串在回油路上）。 
   溢流閥一般有兩種結(jié)構(gòu)：1、直動(dòng)型溢流閥 。2、先導(dǎo)型溢流閥。
   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、
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