浮動式球閥的球、閥桿、手柄是一個裝配單元,閥桿頭部采用扁方結(jié)構(gòu),由手柄所處位置容易辨別出是閥門處于開位置或關(guān)位置。當(dāng)手柄或閥桿頭部的扁方與管線平行時,閥門處于全開位置;當(dāng)手柄或閥桿頭部的扁方與管線垂直時.閥門處于全關(guān)位置。
為防止閥門開關(guān)受到誤動作以及不可預(yù)知的線路振動而產(chǎn)生的不應(yīng)有的開關(guān)動作,在閥門的全開和全關(guān)位置設(shè)有鎖定孔,并可用掛鎖鎖定閥門.特別是安裝在野外的閥門或在可燃性介質(zhì)的石油類和化學(xué)藥品的生產(chǎn)線或當(dāng)工藝流程中不允許開或關(guān)閥門時.為防止其他人員錯誤操作閥門,該鎖定裝置就會體現(xiàn)出其獨(dú)特的優(yōu)越性.
當(dāng)介質(zhì)通過閥門時,閥體中腔的壓力可能將閥桿推出。為防止這種情況發(fā)生,在援桿下部設(shè)置一防飛出結(jié)構(gòu)(圖1)0這樣,即使火災(zāi)時填料、止推軸承被燒摜或其它原因引起填料等損壞.閥體內(nèi)的介質(zhì)壓力將使閥扦法蘭與閥體上密封面緊密接觸,防止介質(zhì)大量從損壞的填料部位處泄漏。
軟密封球閥設(shè)計(jì)了防靜電裝置(圖2)和防火結(jié)構(gòu)(圖3)。當(dāng)發(fā)生火災(zāi)時,一旦閥座被燒摜,球體將直接和閥體上的金屬面接觸,從而阻止介質(zhì)大量從燒損的閥座處泄漏。
多年的球閥制造經(jīng)驗(yàn)與國外先進(jìn)技術(shù)的結(jié)合而設(shè)計(jì)的雙線密封(圖4),可自然泄壓閥座(圖5),能保證壽、低壓及真空狀態(tài)下的完全密封。
浮動式球閥的閥門流量孔徑與管線內(nèi)徑一致(客戶要求時可為縮徑),以便管線清掃(圖6)。
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