DBW30B2-5X/315-6EG24N9K4液壓機械溢流閥

DBW30B2-5X/315-6EG24N9K4液壓機械溢流閥 德國博世力士樂REXROTH溢流閥

溢流閥是壓力控制閥。其作用主要是控制系統(tǒng)壓力，以保護油泵和油路系統(tǒng)的安全及保持油路系統(tǒng)的壓力恒定。通經(jīng)為8毫米的溢流閥是一個小型的直接動作的溢流閥，可以和主溢流閥的遙控口連接，對主溢流閥實現(xiàn)遠程壓力調節(jié)。溢流閥的遙控口經(jīng)換向閥和油箱連接時，可使油路卸荷。此時溢流閥起卸荷作用。溢流閥的遙控口串聯(lián)換向閥和通經(jīng)為8毫米的溢流閥時，可實現(xiàn)壓力的多級控制。更換溢流閥的調節(jié)彈簧，可改變其壓力調節(jié)范圍。手輪順時針轉動時，壓力升高。反之壓力降低。

 

溢流閥是一種液壓壓力控制閥，在液壓設備中主要起定壓溢流作用，穩(wěn)壓，系統(tǒng)卸荷和安全保護作用。

定壓溢流作用：在定量泵節(jié)流調節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當系統(tǒng)壓力加大時，會使流量需求減小。此時溢流閥開啟，使多余流量溢回油箱，保證溢流閥進口壓力，即泵出口壓力恒定（閥口常隨壓力波動開啟）。

穩(wěn)壓作用：溢流閥串聯(lián)在回油路上，溢流閥產生背壓，運動部件平穩(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，當電磁鐵通電時，溢流閥的遙控口通油箱，此時液壓泵卸荷。溢流閥此時作為卸荷閥使用。

安全保護作用：系統(tǒng)正常工作時，閥門關閉。只有負載超過規(guī)定的較限（系統(tǒng)壓力超過調定壓力）時開啟溢流，進行過載保護，使系統(tǒng)壓力不再增加（通常使溢流閥的調定壓力比系統(tǒng)高工作壓力高10%～20%）。

實際應用中一般有：作卸荷閥用，作遠程調壓閥，作高低壓多級控制閥，作順序閥，用于產生背壓（串在回油路上）。

 

溢流閥一般有兩種結構：1、直動型溢流閥 。2、先導式溢流閥。

對溢流閥的主要要求：調壓范圍大，調壓偏差小，壓力振擺小，動作靈敏，過載能力大，噪聲小。

先導型溢流閥的導閥部分結構尺寸較小，調壓彈簧不必很強，因此壓力調整比較輕便。但因先導型溢流閥要在先導閥和主閥都動作后才能起控制作用，因此反應不如直動型溢流閥靈敏。

與三節(jié)同心結構相比，二節(jié)同心結構的特點是：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，故結構簡單，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��；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。

溢流閥在裝配或使用中，由于“O”形密封圈、組合密封圈的損壞，或者安裝螺釘、管接頭的松動，都可能造成不應有的外泄漏。

如果錐閥或主閥芯磨損過大，或者密封面接觸不良，還將造成內泄漏過大，甚至影響正常工作。

電磁溢流閥常見的故障有先導電磁閥工作失靈、主閥調壓失靈和卸荷時的沖擊噪聲等。后者可通過調節(jié)加置的緩沖器來減少或消除。如不帶緩沖器，則可在主閥溢流口加一背壓閥。(壓力一 般調至5kgf/cm2左右，即0.5MPa)。

溢流閥型號

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R900523145 DBW30B2-5X/315-6AW110-50NK4V

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R900527020 DBW30B2-5X/315-6AW220-50NK4

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R900597762 DBW30B2-5X/315-6AW220-50NZ4

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R900509714 DBW30B2-5X/315-6AW220-50NZ4VSO31

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R900501899 DBW30B2-5X/315-6AW220-50NZ5LV

R900501899 DBW30B2-5X/315-6AW220-50NZ5LV

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R900517334 DBW30B2-5X/315-6BG26N1Z4SO449

R900536827 DBW30B2-5X/315-6BW220RNEX

R900536827 DBW30B2-5X/315-6BW220RNEX

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R900945554 DBW30B2-5X/315-6EG220N9K4

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R900912140 DBW30B2-5X/315-6EG26N9Z4

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R900977910 DBW30B2-5X/315-6EG60N9K4

R900911011 DBW30B2-5X/315-6EG60N9Z4

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R900915217 DBW30B2-5X/315-6EW110N9K4

R901033726 DBW30B2-5X/315-6EW110N9K4/12

R900244626 DBW30B2-5X/315-6EW110N9K4=CSA

R901162441 DBW30B2-5X/315-6EW110N9K4B08

R901236547 DBW30B2-5X/315-6EW110N9K4B10

R900911655 DBW30B2-5X/315-6EW110N9K4V

R978913080 DBW30B2-5X/315-6EW110N9K4V/12

R900969902 DBW30B2-5X/315-6EW110N9K4V/12=CSA

R901314141 DBW30B2-5X/315-6EW110N9K4V=CSA

R900910899 DBW30B2-5X/315-6EW110N9Z4

R900915150 DBW30B2-5X/315-6EW110N9Z45V/12

R900910900 DBW30B2-5X/315-6EW110N9Z5LV

R900908480 DBW30B2-5X/315-6EW110NZ55L/12

R900949651 DBW30B2-5X/315-6EW127N9K4V

R900908661 DBW30B2-5X/315-6EW220N9Z4

R900908661 DBW30B2-5X/315-6EW220N9Z4

R900926947 DBW30B2-5X/315-6EW230N9K4

R900922238 DBW30B2-5X/315-6EW230N9K4B

R900927155 DBW30B2-5X/315-6EW230N9K4V

R900911411 DBW30B2-5X/315-6EW230N9Z4

R900914498 DBW30B2-5X/315-6EW230N9Z5L

R900597130 DBW30B2-5X/315-6SLG24NZ4

R900539938 DBW30B2-5X/315-6SLG24NZ5L

R900508233 DBW30B2-5X/315-6SLW110RNZ5LSO31

R900921505 DBW30B2-5X/315-6SMG24N9K4

R900546650 DBW30B2-5X/315-6SMG24N9Z4

R900951432 DBW30B2-5X/315-6SMG48N9K4

R900902906 DBW30B2-5X/315-6SMG48N9Z5L/12

先導型溢流閥的導閥部分是一個易振部位所示。在高壓情況下溢流時，導閥的軸向開口很小，僅0.003~0.006厘米。過流面積很小，流速很高，可達200米/秒，易引起壓力分布不均勻，使錐閥徑向力不平衡而產生振動。另外錐閥和錐閥座加工時產生的橢圓度、導閥口的臟物粘住及調壓彈簧變形等，也會引起錐閥的振動。所以一般認為導閥是發(fā)生噪聲的振源部位。由于有彈性元件(彈簧)和運動質量(錐閥)的存在，構成了一個產生振蕩的條件，而導閥前腔又起了一個共振腔的作用，所以錐閥發(fā)生振動后易引起整個閥的共振而發(fā)出噪聲，發(fā)生噪聲時一般多伴隨有劇烈的壓力跳動。