外文翻譯--橡膠密封蝶閥-ansiawwa c504

1、<p>　　外 文 翻 譯</p><p>　　題 目：橡膠密封蝶閥-ANSI/AWWA C504</p><p><b>　　AWWA標(biāo)準(zhǔn)</b></p><p>　　這份文件是美國給水工程協(xié)會（AWWA）標(biāo)準(zhǔn)。它不是說明書。AWWA標(biāo)準(zhǔn)規(guī)定的是最低要求，不包括說明書中通常包含的全部工程和管理信息。AWWA標(biāo)準(zhǔn)通常

2、包括必須由標(biāo)準(zhǔn)使用者給與評定的選項。直到每個任選功能經(jīng)過使用者的規(guī)定，產(chǎn)品和服務(wù)才完全定義。AWWA標(biāo)準(zhǔn)的出版物不包括任何產(chǎn)品或產(chǎn)品類型的認(rèn)可，或任何產(chǎn)品的AWWA測試，認(rèn)證或許可。AWWA標(biāo)準(zhǔn)的使用完全是自愿的。AWWA標(biāo)準(zhǔn)試圖代表水供應(yīng)行業(yè)的多數(shù)人的意見，從而使描述的產(chǎn)品可以提供滿意的服務(wù)。當(dāng)AWWA修改或撤銷本標(biāo)準(zhǔn)，正式的通知將出現(xiàn)在AWWA雜志的分類廣告部分的第一頁。正式通知所在的那期AWWA雜志發(fā)行后的下一個月的第一天，此項措

3、施生效。</p><p>　　美國國家標(biāo)準(zhǔn)(ANSI)</p><p>　　美國國家標(biāo)準(zhǔn)意味著與范圍和規(guī)定密切相關(guān)的一致同意。美國國家標(biāo)準(zhǔn)將作為一個指導(dǎo)來協(xié)助生產(chǎn)商，消費者，和公眾。美國國家標(biāo)準(zhǔn)的存在不排除任何人，無論是否持有許可的標(biāo)準(zhǔn)，從生產(chǎn)，營銷，采購或使用，加工，生產(chǎn)產(chǎn)品是否按照標(biāo)準(zhǔn)。美國國家標(biāo)準(zhǔn)進(jìn)行周期性檢查，使用者應(yīng)注意要獲得最新版本。按照美國國家標(biāo)準(zhǔn)生產(chǎn)產(chǎn)品的廠商被鼓勵在廣告和

4、宣傳材料上外表或標(biāo)牌上聲明產(chǎn)品是按照精確的美國國家標(biāo)準(zhǔn)生產(chǎn)的</p><p><b>　　引言</b></p><p><b>　　背景：</b></p><p>　　蝶閥一般用于液體和氣體傳輸管線。蝶閥的生產(chǎn)商研制了用于冷水系統(tǒng)和電站的密封橡膠密封類型。自從1940年，此類用途中的許多新型閥門都已經(jīng)是橡膠密封蝶閥。<

5、;/p><p>　　從20世紀(jì)40年代末以來，橡膠密封蝶閥在用于水處理廠，自來水供應(yīng)和輸送管線已經(jīng)得到了廣泛的認(rèn)可，以為：（1）它們可以提供密閉的關(guān)閉；（2）操作相對簡單，即使在通過閥門時存在很大壓力差的情況下；（3）安裝間距要求較小。</p><p><b>　　橡膠密封蝶閥</b></p><p><b>　　概述</b>

6、</p><p><b>　　1.1范圍</b></p><p>　　本標(biāo)準(zhǔn)規(guī)定了pH值范圍為6~12，溫度范圍33~125℉(0.6~52℃)的淡水系統(tǒng)中使用的直徑為3in.(75mm)~72in.(1,800mm)，各類閥體及端部的橡膠密封蝶閥的最低要求。本標(biāo)準(zhǔn)包括適用于最大穩(wěn)態(tài)介質(zhì)工作壓力為250psig(1,723kPa)，最大穩(wěn)態(tài)差動壓力為250psig(1

7、,723kPa)和最大全開流速為16英尺/秒(4.9米/秒)的橡膠密封蝶閥。</p><p>　　1.1.1閥體類型、壓力等級各、和規(guī)格</p><p>　　本標(biāo)準(zhǔn)規(guī)定的閥門有4種閥體類型和下列壓力等級。</p><p>　　1.1.1.1對夾型閥門 </p><p>　　規(guī)格為3~20in(75~500mm)的150磅級對夾式閥門。<

8、/p><p>　　1.1.1.2短型和長型法蘭端閥門 </p><p>　　規(guī)格為3~72in(75~1,800mm)的25A、25B、75A、75B、150A、和150B磅級以及規(guī)格3~48in(75~1,200mm)的250B磅級的閥門</p><p>　　1.1.1.3機械連接端閥門</p><p>　　規(guī)格為3~24in(75~600mm

9、)的150B和250B磅級以及規(guī)格30~48in(750~1,200mm)的250B磅級的閥門</p><p>　　1.1.2類別的界定</p><p>　　無論何種情況，數(shù)值壓力代號代表閥門的設(shè)計壓力額定值（最大穩(wěn)態(tài)介質(zhì)工作壓力），單位：lb/in2. 代號“A”和“B”界定了閥門在全開位置的流量特性?！癆”閥門額定用于最大流速（在閥門上游管道部位）為8英尺/秒（2.4米/秒），“B”閥

10、門額定用于最大流速（在閥門上游管道部位）16英尺/秒（4.9米/秒）。</p><p><b>　　1.2 目的</b></p><p>　　本標(biāo)準(zhǔn)旨在規(guī)定淡水系統(tǒng)用橡膠密封閥門的最低要求。</p><p><b>　　1.3 用途</b></p><p>　　可在上述界定范圍內(nèi)的橡膠密封蝶閥規(guī)范中

11、引用本標(biāo)準(zhǔn)。</p><p><b>　　2. 引用標(biāo)準(zhǔn)</b></p><p>　　以下文件為目前的標(biāo)準(zhǔn)的版本。以下文件為此標(biāo)準(zhǔn)的一部分也為部分制定標(biāo)準(zhǔn)。在任何沖突情況下，都按照此標(biāo)準(zhǔn)執(zhí)行。</p><p>　　ANSI*/AWWA C111/A21.11-球墨鑄鐵壓力管和管件用橡膠墊片美國國家標(biāo)準(zhǔn)。</p><p>

12、　　ANSI/AWWA C540-閥門和滑閥用動力傳動裝置標(biāo)準(zhǔn)</p><p>　　ANSI/AWWA C550-閥門和消防栓用保護(hù)性環(huán)氧樹脂內(nèi)涂層標(biāo)準(zhǔn)。</p><p>　　ASME+ B16.1-鑄鐵管法蘭和法蘭固件</p><p>　　ASME 鍋爐和壓力容器規(guī)范</p><p>　　ASTM++ A36-碳結(jié)構(gòu)鋼標(biāo)準(zhǔn)規(guī)范</p&

13、gt;<p>　　ASTM A48-灰鑄鐵件標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A108-標(biāo)準(zhǔn)質(zhì)量的冷作碳鋼棒料標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A126-閥門、法蘭和管件用鑄鋼件標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A216-高溫適于熔焊的碳鋼鑄件標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A240-壓力容器用耐熱鉻及

14、硌鎳不銹鋼板、薄板和帶鋼標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A276-不銹鋼棒料和型材標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A395-高溫承壓件用鐵素體球墨鑄鐵標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A436-奧氏體灰鑄鐵件標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A439-奧氏體球墨鑄鐵件標(biāo)準(zhǔn)規(guī)范</p><p>

15、;　　ASTM A516-中、低溫壓力容器用碳鋼鋼板標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A536-球墨鑄鐵件標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A564-經(jīng)熱軋和冷作時效硬化處理的不銹鋼棒料和型材標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM A743/A743M-一般耐腐蝕用的鐵鉻、鐵鉻鎳標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM B127-鎳

16、銅合金(UNS N04400)鋼板、薄板和帶鋼標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM B154-銅及銅合金硝酸亞汞試驗的標(biāo)準(zhǔn)試驗方法</p><p>　　ASTM B160-鎳桿和鎳棒標(biāo)準(zhǔn)規(guī)范</p><p>　　ASTM C633-火焰噴涂層的粘結(jié)或附著強度的標(biāo)準(zhǔn)試驗方法</p><p>　　ASTM D429-橡膠性能—與剛性基底粘接性的

17、標(biāo)準(zhǔn)試驗方法</p><p>　　ASTM D471-液體對橡膠性能影響的標(biāo)準(zhǔn)試驗方法</p><p>　　ASTM D1141-橡膠退化在臭氧室內(nèi)表面裂紋的標(biāo)準(zhǔn)試驗方法</p><p>　　ASTM D1149-橡膠磨損表面在容器內(nèi)的氧化裂紋</p><p>　　AWWA 手動 M49，蝶閥：扭矩、壓力損失、和氣穴現(xiàn)象分析。</p&g

18、t;<p><b>　　3定義</b></p><p>　　下列定義適用于本標(biāo)準(zhǔn)。</p><p>　　傳動裝置：與閥門相連用以將蝶板旋至開啟，關(guān)閉或中間位置，防止蝶板超行程并可將蝶板保持在任意位置。</p><p>　　軸套：閥體凸臺處的圓柱狀軸頸，用以支撐閥桿并在減少摩擦和磨損的同時向閥體傳遞蝶板力。</p>&

19、lt;p>　　閥體：閥門的主要承壓結(jié)構(gòu)件，該件構(gòu)成管道的一部分，并有與管道相連的端部。</p><p>　　蝶閥：以一個可旋轉(zhuǎn)約90度角的蝶板作為關(guān)閉件的閥門。當(dāng)?shù)宓倪吘壌怪庇诹鞯罆r，閥門開啟；或當(dāng)定位開啟和關(guān)閉之間是作節(jié)流用。</p><p>　　鏈輪：鉸鏈的一個閉環(huán)搭在鏈驅(qū)動輪上，以簡化高出安裝閥門的操作。</p><p>　　液動裝置：利用并將流體動力

20、轉(zhuǎn)換成作用在汽缸內(nèi)活塞上的液壓或氣壓。</p><p>　　蝶板：位于介質(zhì)流中用以釋放或阻斷介質(zhì)（取決于關(guān)閉件的位置），并且從全開到全閉位置要旋轉(zhuǎn)90度角的關(guān)閉件。</p><p>　　電動裝置：通過齒輪減速裝置將電能轉(zhuǎn)換成機械能的電動機械傳動裝置。</p><p>　　介質(zhì)的工作壓力：在不考慮蝶板位置或傳動裝置容量的情況下設(shè)計的閥體內(nèi)部靜水壓。</p>

21、<p>　　手輪：與傳動裝置的輸入軸相連的圓盤狀部件以便于手動操作閥門。</p><p>　　軸頸：閥體內(nèi)鑄出的結(jié)構(gòu)性凸面（凸臺），用以支撐閥桿軸套和閥桿。</p><p>　　長形法蘭端閥門：設(shè)計安裝和連接在管道法蘭之間的法蘭蝶閥門。</p><p>　　手動傳動裝置：無需外部能源(比如電能 或液壓)即可由一個人操作的傳動裝置。</p>

22、<p>　　制造商：制造，裝配或生產(chǎn)材料或產(chǎn)品的一方。</p><p>　　配合表面：閥體內(nèi)圈或閥門閥板外緣的金屬環(huán)。當(dāng)?shù)尻P(guān)閉時，該金屬環(huán)與橡膠閥座密封。</p><p>　　機械連接閥：具有符合ANSI/AWWA C111/A21.11規(guī)定的機械連接端的閥門。</p><p>　　O型圈密封；由圓環(huán)狀（即圓狀截面的圓環(huán)）橡膠體構(gòu)成的密封件。</

23、p><p>　　外置止腿軸承：安裝在閥桿密封外部軸上的軸承，或安裝在傳動裝置箱體內(nèi)用以保護(hù)閥桿密封免受傳動裝置的側(cè)向推力作用的軸承。</p><p>　　買方：購買設(shè)備材料或待做工作的個人，公司或機構(gòu)。</p><p>　　額定差動壓力：1.1.2節(jié)中定義的壓力登記。</p><p>　　橡膠閥座：閥板外緣或閥體內(nèi)側(cè)的橡膠圈。蝶板關(guān)閉時，該橡膠圈

24、可與金屬密封面實現(xiàn)密封。</p><p>　　閥桿：通過閥體套節(jié)伸至蝶板中，用以支撐蝶板并將操作扭矩傳遞給蝶板關(guān)閉件的桿狀件。</p><p>　　閥桿密封：閥桿和閥體套節(jié)圓柱表面之間形成的柱狀密封副，用以防止帶壓介質(zhì)從閥桿穿過閥體的位置流出和外來雜質(zhì)從該位置流入閥體內(nèi)。</p><p>　　短型法蘭端閥門：設(shè)計安裝和連接在管道法蘭之間的法蘭端閥門。</p&g

25、t;<p>　　供應(yīng)商：提供材料或服務(wù)的一方。供應(yīng)商可以是也可以不是制造商。</p><p>　　止推軸承：支撐閥桿軸向力，并將蝶板定位在閥體中心的位置。</p><p>　　對夾式閥門：有最小結(jié)構(gòu)長，設(shè)計安裝在管道法蘭間的無法蘭閥門。</p><p>　　橡膠密封蝶閥的安裝，操作和維護(hù)</p><p>　　此信息只為參考，不是

26、ANSI/AWWA C504標(biāo)準(zhǔn)的一部分</p><p><b>　　A.1 概述</b></p><p>　　對于任何一個輸水系統(tǒng)或水處理廠來說，蝶閥都是非常重要的部件。由于閥門在這類系統(tǒng)中的錯誤安裝，不正確的操作或維護(hù)導(dǎo)致的閥門失效會造成系統(tǒng)受損，停線或產(chǎn)生昂貴的技術(shù)費用。用于地下設(shè)施或地下安裝的閥門，如果蝶閥出現(xiàn)問題或功能失靈，更正或消除這些問題需要進(jìn)行大面積的

27、，費用昂貴的挖掘工作。有關(guān)蝶閥的許多問題均源自執(zhí)行了不正確的安裝，操作或維護(hù)程序。</p><p><b>　　A.2存放</b></p><p>　　如果無法做到戶內(nèi)存放閥門，則應(yīng)保護(hù)閥門和傳動裝置免受風(fēng)雨以及塵埃、石塊、石膏等的沉積。當(dāng)存放裝有動力傳動裝置和控制裝置的閥門時，應(yīng)讓傳動裝置通電或用別的方式保護(hù)電控裝置以免因溫度變化而冷凝造成電氣插頭腐蝕。此外，還應(yīng)閱

28、讀制造商制定的存放說明。</p><p>　　A.3 安裝前的檢查</p><p>　　確保法蘭面、連接件密封面、閥座密封面和蝶板密封面清潔。檢查連接傳動裝置和閥門的栓接是否在傳輸和搬運過程中松動。如果松動了，要擰緊。開啟、關(guān)閉閥門以確保閥門能夠正確運轉(zhuǎn)，限位塊或限位開關(guān)設(shè)置正確以使閥門能夠完全密封。安裝前關(guān)閉閥門。</p><p><b>　　A.4 安

29、裝</b></p><p>　　強力推薦在蝶閥安裝前詳細(xì)閱讀閥門制造商提供的所有說明手冊。在安裝前，確保在現(xiàn)場按照A.3節(jié)的規(guī)定進(jìn)行了檢驗。</p><p>　　A.4.1 應(yīng)小心搬運閥門就位，避免與其他設(shè)備、掩體、地溝相接觸或碰撞。</p><p>　　A.4.2 按照制造商手冊安裝閥門。維修大于48“的閥門，非常重要的是避免閥門在管道上的負(fù)荷，可能導(dǎo)

30、致閥門操作不在圓周上，如閥門操作基礎(chǔ)沒有管道適當(dāng)?shù)闹С?。閥門應(yīng)該與毗鄰的管道分開單獨支撐，而管道也與閥門單獨分開進(jìn)行支撐。管道的進(jìn)水口和出水口的支撐應(yīng)在閥門的有效范圍內(nèi)。這樣就可以轉(zhuǎn)移大部分的靜態(tài)負(fù)荷，并且在維修安裝和拆卸閥門時，方便管道問題的鑒定。關(guān)于管道應(yīng)考慮到的事項包括法蘭允許的負(fù)荷量，熱膨脹和收縮，還有不均勻沉降。</p><p>　　A.4.3 對密封可調(diào)式閥門，閥座調(diào)節(jié)件應(yīng)安裝在閥門的側(cè)面以便于使用過

31、程中進(jìn)入和調(diào)節(jié)。</p><p>　　A.4.4 當(dāng)操作閥門時，蝶閥上的雜質(zhì)可以損壞橡膠閥座。在連接閥門與管道之前，應(yīng)確保閥門內(nèi)部和相鄰的管道不含雜質(zhì)。。</p><p>　　A.4.5 根據(jù)制管商的使用說明書為連接件準(zhǔn)備管端并安裝閥門。不能損壞管子與閥門的連接。不能將閥門用作管子矯直器。安裝程序應(yīng)盡可能減小管道載荷造成的閥門彎曲。</p><p>　　A.4.6

32、開啟時，應(yīng)確保蝶板不會碰到管子通道。對于使用對夾式蝶閥的襯里管道來說，這一點尤為重要。核對制造商建議的適于規(guī)定間隙的最小管道內(nèi)徑（ID）.</p><p><b>　　A.5 維護(hù)</b></p><p>　　通常用戶對橡膠密封蝶閥的維護(hù)僅限于對傳動裝置和閥桿密封的維護(hù)。當(dāng)出現(xiàn)通過閥板的泄漏時，有些閥門設(shè)計結(jié)構(gòu)允許現(xiàn)場調(diào)節(jié)或更換橡膠密封閥座。除非用戶有專業(yè)技術(shù)人員和適

33、當(dāng)?shù)脑O(shè)備，否則閥門內(nèi)部出現(xiàn)的任何問題通常需要將閥門從管線上拆下來，并返回閥門制造商那里維修。</p><p>　　A.5.1 正常的維護(hù)是對傳動裝置和閥桿密封的維護(hù)。密封泄露、零件破損、操作困難以及某些情況下的閥座泄露，在報告缺陷后應(yīng)由修理班組人員盡早修復(fù)。</p><p>　　A.5.2 如果準(zhǔn)備現(xiàn)場修補，修補人員應(yīng)將全部備件帶到現(xiàn)場。在修補操作之前，一定要閱讀閥門制造商的維護(hù)手冊。&l

34、t;/p><p>　　A.5.3 在進(jìn)行任何修正性的維護(hù)之前，應(yīng)規(guī)定關(guān)閉管線介質(zhì)流并將閥門與管線壓力斷開。</p><p>　　A.5.4 修補完成之后，完成一次完整的操作循環(huán)，并且在管線壓力恢復(fù)以后，檢查泄露情況。</p><p>　　A.5.5 如果大的修補需要將閥門拆開來維修，一定要通知供水和防火部門相關(guān)各方面閥門和管線在維修中。在修補和重新安裝完畢后，再通知他們

35、閥門和管線已恢復(fù)使用狀態(tài)。</p><p>　　原文出處：ANS/ AWWA C504[S].</p><p>　　AWWA Standard</p><p>　　This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA

36、standards</p><p>　　describe minimum requirements and do not contain all of the engineering and administrative information normally</p><p>　　contained in specifications. The AWWA standards usuall

37、y contain options that must be evaluated by the user of the</p><p>　　standard. Until each optional feature is specified by the user, the product or service is not fully defined. AWWA</p><p>　　pu

38、blication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify,</p><p>　　or approve any product. The use of AWWA standards is entirely voluntary. AWWA sta

39、ndards are intended to represent a</p><p>　　consensus of the water supply industry that the product described will provide satisfactory service. When AWWA revises</p><p>　　or withdraws this stan

40、dard, an official notice of action will be placed on the first page of the classified advertising</p><p>　　section of Journal AWWA. The action becomes effective on the first day of the month following the mo

41、nth of Journal</p><p>　　AWWA publication of the official notice.</p><p>　　American National Standard</p><p>　　An American National Standard implies a consensus of those substantiall

42、y concerned with its scope and provisions. An</p><p>　　American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The</p><p>　　existence of

43、an American National Standard does not in any respect preclude anyone, whether that person has</p><p>　　approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes,

44、or procedures</p><p>　　not conforming to the standard. American National Standards are subject to periodic review, and users are cautioned</p><p>　　to obtain the latest editions. Producers of go

45、ods made in conformity with an American National Standard are</p><p>　　encouraged to state on their own responsibility in advertising and promotional materials or on tags or labels that the</p><p&

46、gt;　　goods are produced in conformity with particular American National Standards.</p><p>　　I. Introduction.</p><p>　　Background. Butterfly valves are generally used for pipelines carrying</p

47、><p>　　liquids and gases. Manufacturers of butterfly valves developed tight-closing,</p><p>　　rubber-seated types for cooling water systems and power stations. Since 1940, most</p><p>

48、　　new valves installed for this type of service have been rubber-seated butterfly valves.</p><p>　　Since the late 1940s, rubber-seated butterfly valves have gained increased</p><p>　　acceptance

49、for use in water treatment plants and water supply and distribution lines</p><p>　　because (1) they provide tight shutoff; (2) are relatively easy to operate, even with</p><p>　　large pressure d

50、ifferentials across the valves; and (3) require relatively little space for</p><p>　　installation.</p><p>　　Rubber-Seated Butterfly Valves</p><p>　　SECTION 1: GENERAL</p><

51、;p>　　Sec. 1.1 Scope</p><p>　　This standard establishes minimum requirements for rubber-seated butterfly</p><p>　　valves, 3 in. (75 mm) through 72 in. (1,800 mm) in diameter, with various body

52、 and</p><p>　　end types, for fresh water having a pH range from 6–12 and a temperature range</p><p>　　from 33°–125°F (0.6°–52°C). This standard covers rubber-seated butterfly

53、 valves</p><p>　　suitable for a maximum steady-state fluid working pressure of 250 psig (1,723 kPa, a</p><p>　　maximum steady-state differential pressure of 250 psi (1,723 kPa), and a maximum<

54、;/p><p>　　full open velocity of 16 ft/sec (4.9 m/sec).</p><p>　　1.1.1 Body types, classes, and sizes. Valves described in this standard are provided</p><p>　　in four body types and in

55、classes as follows:</p><p>　　1.1.1.1 Wafer valves. Class 150B, in sizes 3–20 in. (75–500 mm).</p><p>　　1.1.1.2 Short-body and long-body flanged valves. Class 25A, class 25B,</p><p>

56、　　class 75A, class 75B, class 150A, and class 150B, in sizes 3–72 in. (75–1,800 mm),</p><p>　　and class 250B in sizes 3–48 in. (75–1,200 mm).</p><p>　　1.1.1.3 Mechanical-joint-end valves. Class

57、150B and class 250B, in sizes 3–</p><p>　　24 in. (75–600 mm), and class 25A, class 25B, class 75A, class 75B, class 150A,</p><p>　　class 150B, and class 250B, in sizes 30–48 in. (750–1,200 mm).&

58、lt;/p><p>　　1.1.2 Definition of classification. In each case, the numeric designation represents</p><p>　　the pressure rating (the maximum steady-state fluid working pressure, in</p><p&g

59、t;　　pounds per square inch gauge) and also the maximum steady-state differential</p><p>　　pressure, in pounds per square inch, for which the valve is designed. The designations</p><p>　　A and B

60、define the flow-rate capabilities with the valve in the fully open position. A</p><p>　　valves are rated for a maximum velocity of 8 ft/sec (2.4 m/sec), and B valves are rated</p><p>　　for a max

61、imum velocity of 16 ft/sec (4.9 m/sec) in the piping section upstream of the</p><p><b>　　valve.</b></p><p>　　Sec. 1.2 Purpose</p><p>　　The purpose of this standard is to

62、 provide the minimum requirements for</p><p>　　rubber-seated butterfly valves, suitable for freshwater service.</p><p>　　Sec. 1.3 Application</p><p>　　This standard can be reference

63、d in purchase documents for rubber-seated</p><p>　　butterfly valves, which are described by the scope as defined above.</p><p>　　SECTION 2: REFERENCES</p><p>　　This standard referen

64、ces the following documents in their current editions.</p><p>　　These documents form a part of this standard to the extent specified within the</p><p>　　standard. In any case of conflict, the re

65、quirements of this standard shall prevail.</p><p>　　ANSI*/AWWA C111/A21.11—American National Standard for Rubber-Gasket</p><p>　　Joints for Ductile-Iron Pressure Pipe and Fittings.</p>&l

66、t;p>　　ANSI/AWWA C540—Power-Actuating Devices for Valves and Slide Gates.</p><p>　　ANSI/AWWA C550—Protective Interior Coatings for Valves and Hydrants.</p><p>　　ASME? B16.1—Cast-Iron Pipe Flan

67、ges and Flanged Fittings.</p><p>　　ASME Boiler and Pressure Vessel Codes.</p><p>　　ASTM? A36—Standard Specification for Carbon Structural Steel.</p><p>　　ASTM A48—Standard Specifica

68、tion for Gray Iron Castings.</p><p>　　ASTM A108—Standard Specification for Steel Bar, Carbon and Alloy,</p><p>　　Cold-Finished.</p><p>　　*American National Standards Institute, 25 W

69、est 43rd Street, Fourth Floor, New York, NY 10036.</p><p>　　?ASME International, Three Park Ave., New York, NY 10016.</p><p>　　?ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 1

70、9428.</p><p>　　RUBBER-SEATED BUTTERFLY VALVES 3</p><p>　　ASTM A126—Standard Specification for Gray Iron Castings for Valves,</p><p>　　Flanges, and Pipe Fittings.</p><p>

71、;　　ASTM A216—Standard Specification for Steel Castings, Carbon, Suitable for</p><p>　　Fusion Welding, for High-Temperature Service.</p><p>　　ASTM A240—Standard Specification for Chromium and Chr

72、omium-Nickel</p><p>　　Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General</p><p>　　Applications.</p><p>　　ASTM A276—Standard Specification for Stainless Ste

73、el Bars and Shapes.</p><p>　　ASTM A395—Standard Specification for Ferritic Ductile Iron Pressure-</p><p>　　Retaining Castings for Use at Elevated Temperatures.</p><p>　　ASTM A436—St

74、andard Specification for Austenitic Gray Iron Castings.</p><p>　　ASTM A439—Standard Specification for Austenitic Ductile Iron Castings.</p><p>　　ASTM A516—Standard Specification for Pressure Ves

75、sel Plates, Carbon Steel,</p><p>　　for Moderate- and Lower-Temperature Service.</p><p>　　ASTM A536—Standard Specification for Ductile Iron Castings.</p><p>　　ASTM A564—Standard Spec

76、ification for Hot-Rolled and Cold-Finished Age-</p><p>　　Hardening Stainless Steel Bars and Shapes.</p><p>　　ASTM A743/A743M—Standard Specification for Castings, Iron-Chromium,</p><p&

77、gt;　　Iron-Chromium-Nickel, Corrosion Resistant, for General Applications.</p><p>　　ASTM B127—Standard Specification for Nickel-Copper Alloy (UNS N04400)</p><p>　　Plate, Sheet, and Strip.</p&g

78、t;<p>　　ASTM B154—Standard Test Method for Mercurous Nitrate Test for Copper</p><p>　　and Copper Alloys.</p><p>　　ASTM B160—Standard Specification for Nickel Rod and Bar.</p><p

79、>　　ASTM C633—Standard Test Method for Adhesion or Cohesion Strength of</p><p>　　Thermal Spray Coatings.</p><p>　　ASTM D429—Standard Test Methods for Rubber Property—Adhesion to</p><

80、;p>　　Rigid Substrates.</p><p>　　ASTM D471—Standard Test Methods for Rubber Property—Effect of Liquids.</p><p>　　ASTM D1141—Standard Practice for the Preparation of Substitute Ocean</p>

81、<p><b>　　Water.</b></p><p>　　ASTM D1149—Standard Test Method for Rubber Deterioration—Surface</p><p>　　Ozone Cracking in a Chamber.</p><p>　　AWWA Manual M49, Butte

82、rfly Valves: Torque, Head Loss, and Cavitation</p><p><b>　　Analysis.</b></p><p>　　SECTION 3: DEFINITIONS</p><p>　　The following definitions shall apply in this standard:

83、</p><p>　　1. Actuator: A device attached to the valve for the purpose of rotating the</p><p>　　valve disc to an open, closed, or intermediate position; preventing disc overtravel; and</p>

84、<p>　　maintaining the disc in any position.</p><p>　　2. Bearing: The cylindrical journal located in the body hubs that is used to</p><p>　　support the valve shaft(s) and transmit disc forc

85、es to the valve body while minimizing</p><p>　　friction and wear.</p><p>　　3. Body: The primary pressure-retaining structure of the valve that forms a</p><p>　　portion of the pipeli

86、ne and that has ends adapted for connection to the piping.</p><p>　　4. Butterfly valve: A valve that uses a disc rotatable through an angle of</p><p>　　approximately 90° as a closure member

87、. The valve is closed when the edge of the disc</p><p>　　is perpendicular to the flow way, open when parallel to the flow way, or used for</p><p>　　throttling when positioned between open and cl

88、osed.</p><p>　　5. Chainwheel: A chain-driven wheel with a closed loop of chain draped</p><p>　　over it to facilitate actuation of an overhead-mounted valve.</p><p>　　6. Cylinder act

89、uator: An actuator that employs fluid power and mechanically</p><p>　　converts hydraulic or pneumatic pressure acting on a piston within a cylinder.</p><p>　　7. Disc: The closure member that is

90、positioned in the flow stream to</p><p>　　permit flow or to obstruct flow (depending on closure position) and that rotates</p><p>　　through an angle of 90° from full open to full shutoff.&l

91、t;/p><p>　　8. Electric actuator: An electromechanical actuator that employs the power</p><p>　　of an electric motor converted through a gear-reduction unit.</p><p>　　9. Fluid working p

92、ressure: The internal hydrostatic pressure for which the</p><p>　　valve body is designed without regard to disc position or actuator capacity.</p><p>　　10. Handwheel: A circular-rimmed component

93、 connected to the input shaft</p><p>　　of an actuator to facilitate manual actuation of a valve.</p><p>　　11. Hub: A structural, raised-area (boss) member cast integrally on the valve</p>

94、<p>　　body and used to support the valve-shaft bearing and valve shaft.</p><p>　　12. Long-body flanged valve: A flanged valve designed to be installed</p><p>　　between, and attached to, pi

95、pe flanges.</p><p>　　13. Manual actuator: An actuator that can be operated by a person without</p><p>　　the need for an external energy source, such as electrical power or fluid pressure</p&g

96、t;<p>　　RUBBER-SEATED BUTTERFLY VALVES 5</p><p>　　14. Manufacturer: The party that manufactures, fabricates, or produces</p><p>　　materials or products.</p><p>　　15. Mating s

97、urface: The metal ring around the inside of the valve body or</p><p>　　the outside edge of the valve disc that seals with the rubber seat when the disc is</p><p><b>　　closed.</b><

98、/p><p>　　16. Mechanical-joint end valve: A valve with mechanical-joint-type ends</p><p>　　conforming to ANSI/AWWA C111/A21.11.</p><p>　　17. O-ring seal: A type of seal consisting of an

99、 elastomer in the shape of a</p><p>　　torus, i.e., a circular shape with a circular cross section.</p><p>　　18. Outboard thrust bearing: A bearing that is provided on the shaft</p><p&

100、gt;　　outboard of the shaft seal or in the actuator housing to protect the shaft seal from</p><p>　　side-thrust forces induced by the actuator.</p><p>　　19. Purchaser: The person, company, or org

101、anization that purchases any</p><p>　　materials or work to be performed.</p><p>　　20. Rated differential pressure: Pressure classes as defined in Sec. 1.1.2.</p><p>　　21. Rubber sea

102、t: A rubber ring around the outside edge of the valve disc or</p><p>　　the inside of the valve body to effect a seal against the metal seating surface when the</p><p>　　disc is closed.</p>

103、<p>　　22. Shaft: A bar extending through the body hubs and into the disc to</p><p>　　support the disc and transmit operating torque to the disc-closure member.</p><p>　　23. Shaft seal: A

104、circular seal between the valve shaft and the inside</p><p>　　cylindrical surface of the body hub that prevents the pressurized water from exiting</p><p>　　and outside contaminants from entering

105、 the valve body in the area where the shaft</p><p>　　protrudes through the body.</p><p>　　24. Short-body flanged valve: A flanged valve designed to be installed</p><p>　　between, an

106、d attached to, pipe flanges.</p><p>　　25. Supplier: The party that supplies material or services. A supplier may or</p><p>　　may not be the manufacturer.</p><p>　　26. Thrust bearing

107、: A device that supports the axial forces of the shaft and is</p><p>　　used to center the disc in the valve body.</p><p>　　27. Wafer valve: A flangeless body valve having a minimal face-to-face

108、laying</p><p>　　length designed to be installed between pipe flanges.</p><p>　　APPENDIX A</p><p>　　Installation, Operation, and Maintenance</p><p>　　of Rubber-Seated Bu

109、tterfly Valves</p><p>　　This appendix is for information only and is not a part of ANSI/AWWA C504.</p><p>　　SECTION A.1: GENERAL</p><p>　　Butterfly valves are a significant componen

110、t of any water distribution system or</p><p>　　treatment plant operation. Valve failure caused by faulty installation, improper</p><p>　　operation, or maintenance in these systems could result i

111、n damage, downtime, and</p><p>　　costly repairs. In buried or underground installations, problems or malfunctions can</p><p>　　result in extensive and costly excavation to correct or eliminate t