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<div>　　<strong>背壓閥</strong>是通過彈簧的彈力來工作的。當系統(tǒng)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(tǒng)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。<br /> </div><div>　　在出口管路中，背壓閥應和脈動阻尼器同時使用，用脈動阻尼器吸收泵和背壓閥之間的流量峰值。沒有脈動阻尼器時，背壓閥將隨著每次泵沖程的進行而快速打開和關閉。有脈動阻尼器時，背壓閥將在半開和半關的位置上振蕩，因而脈動阻尼器可以減少背壓閥的磨損速度。對于大流量的泵，且出口管路長而細，背壓閥的安裝位置應靠近加注點，以減小虹吸的趨勢。當輸送含有懸浮狀固體的介質，在背壓閥入口端應安裝帶管堵的三通(或四通)，使管路在不拆卸的情況下能夠進行清洗。背壓閥只是一種管路元件，只有與其它管路元件(如脈動阻尼器、安全閥、止回閥、截止閥)配合使用才能發(fā)揮效用。<br /> </div><div>　　背壓閥一般有兩種用途：<br /> </div><div>　　1、背壓閥用于防止液體在重力作用下自流(或虹吸)，這時候一般選用大于液體自身壓力即可，如防止液位為2米藥箱中的液體自流,可選用壓力大于0.02MPa的背壓閥，一般選用0.1MPa即可。<br /> </div><div>　　2、背壓閥用于穩(wěn)定泵的流量，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(wěn)定，這時一般選擇<strong>背壓閥</strong>的壓力為泵的實際使用壓力或略小于泵的使用壓力。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。</div> </div> <div id="at5xgcwsgw" class="ly_PrevNext"> <ul> <li>上一篇：<a href="/Article-567117.html">三柱塞往復泵結構合理，傳動平穩(wěn)，無噪音，操作方便</a></li> <li>下一篇：<a href="/Article-564003.html">米頓羅計量泵主要有兩種灌注方式</a></li> </ul> </div> </div>  <div id="at5xgcwsgw" class="ly_foot"> <div id="at5xgcwsgw" 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