DB20-1-52/315溢流安全閥

DB20-1-52/315溢流安全閥 德國博世力士樂REXROTH溢流閥 壓力控制閥 ****現(xiàn)貨

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DB20-1-52/315溢流安全閥

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)長孔，孔徑很小0=0.8~1.2mm,孔長I = 8~12mm,因此工作時易堵塞，一旦堵塞則導(dǎo)致主閥口常開無法調(diào)壓。

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(hù)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(shí)現(xiàn)遠(yuǎn)程壓力調(diào)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(shí)現(xiàn)壓力的多級控制。

DB20-1-52/315溢流安全閥

DB 型壓力閥是一種先導(dǎo)式溢流閥。用于限制工作壓力。

這些溢流閥 (DB) 主要由帶主閥心 (3) 的主閥 (1) 以及帶壓力調(diào)節(jié)元件的先導(dǎo)控制閥 (2) 組成。

施加在通道 P 中的壓力作用于主閥芯 (3)。同時，該壓力通過配有噴嘴 (4) 和 (5) 的控制油路 (6) 和 (7) 施加于主閥芯 (3) 的彈簧負(fù)載側(cè)和先導(dǎo)控制閥 (2) 中的滾珠 (8)。如果通道 P 中的壓力超過彈簧 (9) 上設(shè)定的值，則滾珠 (8) 將背向彈簧 (9) 打開。相應(yīng)的信號通過控制油路 (10) 和 (6) 從通道 P 由內(nèi)部傳出。此時主閥芯 (3) 彈簧負(fù)載側(cè)的液壓油通過控制油路 (7)、噴嘴孔 (11) 和滾珠 (8) 流入彈簧腔 (12)。從此處，液壓油通過控制油路 (13) 從內(nèi)部流入油箱（對于型號 DB …），或通過控制油路 (14) 從外部流入油箱（對于型號 DB …Y）。噴嘴 (4) 和 (5) 會導(dǎo)致主閥芯 (3) 出現(xiàn)壓降，從而使通道 P 到通道 T 的連接打開�，F(xiàn)在，液壓油從通道 P 流到通道 T，同時維持設(shè)定的工作壓力。

溢流閥可通過油口“X”(15) 卸載或切換為另一壓力（第二個壓力等級）。

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止回閥( Check Valve)：是能自動阻止流體倒流的閥門。止回閥的閥瓣在流體壓力作用下開啟，流體從進(jìn)口側(cè)流向出口側(cè)。當(dāng)進(jìn)口側(cè)壓力低于出口側(cè)時，閥瓣在流體壓差、本身重力等因素作用下自動關(guān)閉以防止流體倒流。