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溢流閥工作原理
優(yōu)勢(shì)供應(yīng)ZDB6VP2-4X-315V力士樂(lè)Rexroth疊加溢流閥
溢流閥的結(jié)構(gòu)組成見(jiàn)圖,它由閥體、閥芯、彈簧和調(diào)節(jié)螺釘組成。圖中(a)型是球形閥,(b)型是錐形閥。球形閥用在低壓、小流量液壓系統(tǒng)中;錐形閥用在較高壓小流量液壓系統(tǒng)中。錐形閥的閥芯密封效果好于球形閥。
溢流閥工作時(shí),是利用彈簧的壓力來(lái)調(diào)節(jié)、控制液壓油的壓力大小。從圖3-50中可以看到:當(dāng)液壓油的壓力小于工作需要壓力時(shí),閥芯被彈簧壓在液壓油的流入口,當(dāng)液壓油的壓力超過(guò)其工作允許壓力即大于彈簧壓力時(shí),閥芯被液壓油頂起,液壓油流入,從圖示方向右側(cè)口流出,回油箱。液壓油的壓力越大,閥芯被液壓油頂起得越髙,液壓油經(jīng)溢流閥流回油箱的流量越大o如過(guò)液壓油的壓力小于或等于彈簧壓力,則閥芯落下,封住液壓油進(jìn)口。由于油泵輸出的液壓油壓力固定,而工作油缸用液壓油的壓力總要比油泵輸出液壓油壓力小,所以正常工作時(shí)總會(huì)有一些液壓油從溢流閥處流回油箱,以保持液壓油缸的工作壓力平衡、正常工作。由此可見(jiàn),溢流閥的作用是能夠防止液壓系統(tǒng)中的液壓油壓力超出額定負(fù)荷,起保護(hù)作用。另外,溢流閥與節(jié)流閥配合,節(jié)流閥調(diào)節(jié)液壓油的流量大小,可控制活塞的移動(dòng)速度。
我司經(jīng)銷(xiāo)相關(guān)型號(hào)如下:
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