產(chǎn)品詳情
流量閥的作用是在閥的進(jìn)出口壓差變化的情況下，利用調(diào)節(jié)閥芯和閥體間的節(jié)流口面積和它所產(chǎn)生的局部阻力對流量進(jìn)行調(diào)節(jié)，從而控制執(zhí)行元件的運(yùn)動速度。維持通過的流量恒定，從而維持與之串聯(lián)的被控對象(如一個環(huán)路、一個用戶、一臺設(shè)備等，下同)的流量恒定。管網(wǎng)中應(yīng)用流量閥，可直接根據(jù)設(shè)計來設(shè)定流量，閥門可在水壓作用下，自動消除管線的剩余壓頭及壓力波動所引起的流量偏差。流量閥的名稱較多，如自力式流量平衡閥、定流量閥、動態(tài)平衡閥等。各種類型的流量閥，結(jié)構(gòu)各有不同，但工作原理相似。
流量閥是由一個手動調(diào)節(jié)閥組和一個自動平衡閥組組成。調(diào)節(jié)閥組作用是設(shè)定流量，自動平衡閥組作用是維持流量恒定。系統(tǒng)流體的工作壓力為P1，手動調(diào)節(jié)閥的前后壓力分別為P2、P3。當(dāng)手動調(diào)節(jié)閥調(diào)到某一位置時，即人為確定了“設(shè)定流量”Kv即手動調(diào)節(jié)閥的流量系數(shù)，流量G=Kv（P2-P3），Kv為，Kv設(shè)定后，只要P2－P3不變，則流量G不變。當(dāng)系統(tǒng)流量增大時，(P2—P3)的實(shí)際值超過了允許的給定值，此時通過感壓膜和彈簧作用使自動調(diào)節(jié)閥組自動關(guān)小，直至流量重新維持到設(shè)定流量，反之亦然。
流量閥自動調(diào)節(jié)流量的有效范圍取決于工作彈簧的性能。一般流量閥前后壓差在20—300kPa的范圍內(nèi)能按設(shè)定值有效控制流量。當(dāng)壓小于20kPa時，控制流量達(dá)不到設(shè)定值；壓差超過300kPa時，可能產(chǎn)生噪音。
力士樂流量控制閥0811402622
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