蒸汽疏水閥的容量及安全率的相關(guān)技術(shù)規(guī)范

詞術(shù)語易于混淆+為了使選用者更清楚地了解蒸汽疏水閥并能正確地選用，以下將一些主要名詞術(shù)語予以說明。
    ①機械型蒸汽疏水閣；由凝結(jié)水液位變化驅(qū)動的蒸汽疏水聞。
    ②熱靜力型蒸汽疏水閩；由凝結(jié)水溫度變化驅(qū)動的蒸汽疏水同。
    ③熱動力型蒸汽疏水閥：由蒸汽和凝結(jié)水動態(tài)特性驅(qū)動的蒸汽疏水閥。
    @最高允許壓力；在給定溫度下，蒸汽疏水閥殼體能夠持久承受的最高壓力。
    ⑤最高工作壓力：在正確動作條件下，蒸汽疏水閥進口端的最高壓力，由制造廠紿定。
    ⑥工作背壓：在工作條件下，蒸汽疏水閥出口端的壓力漿液閥。
    ⑦背壓率：工作背壓與工作壓力的百分比。
    ⑧最高允許溫度；在給定壓力下，蒸汽疏水廂殼體能夠持久承受的最高溫度。
    ⑨過玲度：凝結(jié)水溫度與相應(yīng)壓力下飽和溫度之差的絕對值。
    ⑩冷凝結(jié)水排量：在給定壓差和20℃條件下，燕汽疏水闥lh內(nèi)能排出凝結(jié)水的最大重量。
    @熱凝結(jié)水排量：在紿定壓差和溫度下，蒸汽疏水閥1h內(nèi)能排出熱凝結(jié)水的最大重量。
    @菲汽量：單位時間內(nèi)蒸汽疏水閥漏出新鮮蒸汽的量。
    @無負荷漏汽量：蒸汽疏水閥處于完全飽和蒸汽條件下的漏汽量。
    @有負荷漏汽量：給定負荷率下，蒸汽疏水聞的漏汽量，
    @無負荷漏汽率：無負荷漏汽量與相應(yīng)壓力下最大熱凝結(jié)水排量的百分比。
    ⑩有負荷漏汽率：有負荷漏汽置與試驗時間內(nèi)實際熱凝結(jié)水排量的百分比。
    ⑩負荷卓：試驗時間內(nèi)的實際熱凝結(jié)水排量與試驗壓力下最太熱凝結(jié)水排量的百分比。
    (2)蒸汽疏水閥的容量及安全率
    在選擇蒸汽疏水閥時，要充分了解作為使用對象的蒸汽輸送管和各種熱交換器等蒸汽使用設(shè)備的型式和使用目的以及特性等，準(zhǔn)確地掌握設(shè)備本身的容量，這是先決條件。如果知道了蒸汽使用設(shè)備的容量，它所使用的蒸汽疏水閥的容量也就可以確定了。確定蒸汽疏水閥的容量，必須按以下原則求出：
    蒸汽使用設(shè)備的容量(凝結(jié)水產(chǎn)生量)×安全率：蒸汽疏水閥的容量
    安全牢，即是在確定蒸汽疏水閥容量時，蒸汽使用設(shè)備實際的凝結(jié)水產(chǎn)生量與所標(biāo)出容量有誤差時也能確保蒸汽疏水閩能正常工作而估計的安全系數(shù)。這種安全率既不是單純從理論上加以規(guī)定，無法通過計算求得；也不完全來自經(jīng)驗數(shù)據(jù)。一般說來，考慮安全率最好的辦法是直接詢問疏亦閣生產(chǎn)廠家。如果在選用蒸汽疏水閩時，其選用的安全率不當(dāng)，使蒸汽疏水閥的容量過大或不足。都會產(chǎn)生極不良的后果。
    若安全率過大，即安裝使用了容量過大的蒸汽疏水閥時，會產(chǎn)生下列弊端：
    ①蒸汽疏水閣的容量大會增高成本。
    ②若為問歇動作的蒸汽疏水閥時，容量過大會使疏水閥動作周期加長．凝結(jié)水的平均滯留量增加，用汽設(shè)備的能力降低。
    ③對于像浮球式疏水閹那樣連續(xù)(按比例)動作的蒸汽疏水閥，由于闊瓣開度小，過大的容量會使閥座產(chǎn)生拉毛現(xiàn)象(高速流體通垃狹窄的縫隙時，對接觸面產(chǎn)生腐蝕作用，
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