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                                                                                                                                進口背壓閥實物圖

                                                                                                                                  詳細說明

                                                                                                                                  背壓閥的名詞來源于Back?Pressure?Valve。它代表的意思是說由于閥的功能而形成一定的壓力,壓力一般可以調節??捎糜诳刂瓶諝?、水、蒸汽、各種腐蝕性介質、泥漿、油品、液態金屬和放射性介質等各種類型流體的流動。啟閉件是一個圓盤形的閥板,在閥體內繞其自身的軸線旋轉,從而達到啟閉或調節的目的。在管道上主要起切斷和節流作用。最常用的系統有,流體計量投加系統、液壓控制系統、化學反應條件、物態臨界狀態控制等?;究梢苑譃檎{節和過流兩部分。? ?

                                                                                                                                  一、         概述? 、背壓閥功能:、? 背壓閥通過內置彈簧的彈力來實現動作:當系統壓力比設定壓力小時,膜片在彈簧彈力的作用下堵塞管路;當系統壓力比設定壓力大時,膜片壓縮彈簧,管路接通,液體通過背壓閥。背壓閥結構同單向閥相似,但開啟壓力大于單向閥,在0.21.6兆帕間。? 在管路或是設備容器壓力不穩的狀態下,背壓閥能保持管路所需壓力,?使泵能正常輸出流量。另在泵的出端由于重力或其它作用常會出現虹吸現象,此時背壓閥能消減由于虹吸產生的流量及壓力的波動。而對于計量泵等容積泵在低系統壓力下工作時,都會出現過量輸送。為防止類似問題,必須使計量泵的出口至少有0.7Bar的背壓,一般通過在計量泵出口安裝背壓閥來達到目的

                                                                                                                                   

                                                                                                                                  二、主要功能?

                                                                                                                                   1.出口管道上的單向閥用于防止液體回流,背壓閥用于保持泵出口有一恒定壓力。?

                                                                                                                                  2.在要求不是很嚴格的系統中可作為安全閥使用。?

                                                                                                                                  3.和脈動阻尼器配合使用減小水錘對系統的危害,減小流速波動的峰值,保護管路、彎頭、接??頭不受壓力波動的沖擊。?

                                                                                                                                  4.為計量泵創造良好的工作環境并改善泵的工作性能。?

                                                                                                                                   5.保證水泵出水流量的穩定性,如某些泵的流量隨壓力變化較大,可在泵的出口處設置背壓閥,使泵的輸出流量穩定,這時一般選擇背壓閥的壓力為泵的實際使用壓力或略小于泵的使用壓力。

                                                                                                                                  ? 6.在管路或是設備容器壓力不穩的狀態下,能保持管線所需壓力,使泵能正常輸出流量。?

                                                                                                                                   7.在泵的出水口由于重力或其它作用常會出現自流或虹吸現象,背壓閥能消減由于虹吸產生的流量及壓力的波動,這時候一般選用大于液體自身壓力即可。? ?

                                                                                                                                   

                                                                                                                                  ? 三、工作原理? 流體從背壓閥進口進入,被膜片阻擋,于是流體對膜片產生向上的壓力。當壓力足夠大時,彈簧被壓縮,流體頂起膜片形成通道,從背壓閥出口流出;若流體壓力不夠,就會形成憋壓,使進口壓力上升直到達到額定壓力,頂起膜片形成通路。?背壓閥工作原理? 背壓閥的額定壓力可調節,一般通過調節彈簧上端的頂桿,從而調節彈簧的長度來實現

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