先導(dǎo)式減壓閥DR20-5-5X/200YM

先導(dǎo)式減壓閥DR20-5-5X/200YM 德國(guó)進(jìn)口博世力士樂REXROTH直動(dòng)式減壓閥 先導(dǎo)式減壓閥

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先導(dǎo)式減壓閥DR20-5-5X/200YM

特點(diǎn)

采用直接作用隔膜式結(jié)構(gòu)，內(nèi)部結(jié)構(gòu)非常簡(jiǎn)單，無(wú)卡阻，性能可靠，經(jīng)久耐用。耐臟防水垢，不需過(guò)濾器，不需旁通管，配管極其簡(jiǎn)單，能節(jié)省大量空間和配管成本。出口壓力準(zhǔn)確可調(diào)，在一般場(chǎng)合下，可以認(rèn)為出口壓力不受進(jìn)口壓力的影響（出口壓力的變化量是△P1的8%）。非常好的水力特性，壓力損失小，減壓比可達(dá)成10：1以上。可滿足多種減壓要求，特別適用于支管減壓系統(tǒng)。

工作原理

減壓閥出口壓力作用在隔膜底面和閥瓣底面，當(dāng)它超過(guò)彈簧設(shè)定值時(shí)，壓縮彈簧，使閥瓣關(guān)閉。只要下游無(wú)水流動(dòng)，出口壓力將基本保持在設(shè)定值（其變化量?jī)H為入口壓力變化量的8%）；當(dāng)下游用水時(shí)，出口壓力下降，彈簧推開隔膜，打開減壓閥。水流連續(xù)流通一陣后，減壓閥的開啟產(chǎn)生自阻尼效應(yīng)，使啟閉動(dòng)作趨于平穩(wěn)。四、可能的故障原因1.霜凍損壞，在寒冷地區(qū)應(yīng)注意保溫。2.水流方向裝錯(cuò)，減壓閥變成止回閥，出口壓力為0。3.彈簧擰得太緊，無(wú)法關(guān)閉，減壓閥將直通P2=P1。4.旁通管漏水，使P2偏離設(shè)定值，鑒于本減壓閥優(yōu)越的可靠性和耐久性，建議不安裝亮度通管為宜。

安裝事項(xiàng)編輯

減壓閥的減壓保障系統(tǒng)

無(wú)論選用比例式還是可調(diào)式減壓閥，其減壓比P1∶P2不宜選擇過(guò)大，一般應(yīng)控制在5∶1之內(nèi)。超過(guò)這個(gè)范圍易產(chǎn)生氣蝕現(xiàn)象，損壞閥件，產(chǎn)生嘯叫噪音。有些活塞式減壓閥，制造廠在其閥體上加工一個(gè)直徑1.5mm左右的小孔，其功能是讓閥芯運(yùn)動(dòng)時(shí)起到透吸氣作用，維護(hù)管理時(shí)應(yīng)注意千萬(wàn)不要將小孔塞住，否則影響減壓閥的正常運(yùn)行。

減壓閥采用直接作用隔膜式結(jié)構(gòu)，內(nèi)部結(jié)構(gòu)非常簡(jiǎn)單，無(wú)卡阻，性能可靠，經(jīng)久耐用。耐臟防水垢，不需過(guò)濾器，不需旁通管，配管極其簡(jiǎn)單，能節(jié)省大量空間和配管成本。出口壓力準(zhǔn)確可調(diào)，在一般場(chǎng)合下，可以認(rèn)為出口壓力不受進(jìn)口壓力的影響（出口壓力的變化量是△P1的8%）。非常好的水力特性，壓力損失小，減壓比可達(dá)成10：1以上。可滿足多種減壓要求，特別適用于支管減壓系統(tǒng)。

定值器是一種高精度的減壓閥，主要用于壓力定值。目前有兩種壓力規(guī)格的定值器：其氣源壓力分別為0．14MPa和0．35MPa，輸出壓力范圍分別為0—0．1MPa和0一0．25MPa。其輸出壓力波動(dòng)不大于較大輸出壓力的1%，常用于需要供給較好氣源壓力和信號(hào)壓力的場(chǎng)合，如氣動(dòng)實(shí)驗(yàn)設(shè)備、氣動(dòng)自動(dòng)裝置等。

先導(dǎo)式減壓閥DR20-5-5X/200YM

DR型壓力閥是先導(dǎo)式減壓閥。它用于降低系統(tǒng)壓力。

它主要由旋入式插裝閥（濾芯）和外殼組成，可以選擇是否帶有止回閥（僅用于底板安裝）。

在靜止位置，閥門打開。液壓油能夠從輸入通道通過(guò)主控制閥芯（1）自由流動(dòng)到輸出通道。出口通道中的壓力通過(guò)孔（2）施加到主控制閥芯（1）的彈簧加載側(cè)。同時(shí)，壓力通過(guò)孔（3）和（4）作用在主控制閥芯（1）的與彈簧相對(duì)的一側(cè)。

如果出口通道中的壓力超過(guò)在彈簧（6）上設(shè)定的值，則先導(dǎo)提升閥（5）打開。

液壓油從主控制閥芯（1）的彈簧加載側(cè)通過(guò)噴嘴（7）和先導(dǎo)提升閥（5）流入彈簧腔（8）。

主控制閥芯（1）處于其控制位置，并將彈簧（6）上設(shè)定的出口通道中的值保持恒定。從彈簧腔（8）返回的先導(dǎo)油總是通過(guò)Y口（9）從外部實(shí)現(xiàn)。

在底板安裝版本“ P”中，可以選擇安裝一個(gè)止回閥（10），以實(shí)現(xiàn)從通道A到B的自由回流。

類型DR 10 -4-4X /…

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力士樂REXROTH先導(dǎo)式減壓閥DR

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換向閥主要由閥體、密封組件、凸輪、閥桿、手柄和閥蓋等零部件組成(圖1)。閥門由手柄驅(qū)動(dòng)，通過(guò)手柄帶動(dòng)閥桿與凸輪旋轉(zhuǎn)，凸輪具有定位驅(qū)動(dòng)與鎖定密封組件的開啟與關(guān)閉功能。手柄逆時(shí)針旋轉(zhuǎn)，兩組密封組件分別在凸輪的作用下關(guān)閉下端的兩個(gè)通道，上端的兩個(gè)通道分別與管道裝置的進(jìn)口相通。反之，上端的兩個(gè)通道關(guān)閉，下端兩個(gè)通道與管道裝置的進(jìn)口相通，實(shí)現(xiàn)了不停車換向。