閥門工程項(xiàng)目選型案例
閥門工程選型案例
暖通空調(diào)管道用閥門的選型-按防止介質(zhì)倒流選用閥門
這種類型的閥門的作用是只允許介質(zhì)向一個(gè)方向流動(dòng),而且阻止方向流動(dòng)。通常這種閥門是自動(dòng)工作的,在一個(gè)方向流動(dòng)的流體壓力作用下,閥瓣打開;流體反方向流動(dòng)時(shí),由流體壓力和閥瓣的自重合閥瓣作用于閥座,從而切斷流動(dòng)。其中止回閥就屬于這種類型的閥門,它包括旋啟式止回閥和升降式止回閥。旋啟式止回閥有一介鉸鏈機(jī)構(gòu),還有一個(gè)像門一樣的閥瓣自由地靠在傾斜的閥座表面上。為了確保閥瓣每次都能到達(dá)閥座面的合適位置,閥瓣設(shè)計(jì)在鉸鏈機(jī)構(gòu),以便閥瓣具有足夠有旋啟空間,并使閥瓣真正的、全面的與閥座接觸。閥瓣可以全部用金屬制成,也可以在金屬上鑲嵌皮革、橡膠、或者采用合成覆蓋面,這取決于使用性能的要求。旋啟式止回閥在完全打開的狀況下,流體壓力幾乎不受阻礙,因此通過閥門的壓力降相對(duì)較小。升降式止回閥的閥瓣座落位于閥體上閥座密封面上。此閥門除了閥瓣可以自由地升降之外,其余部分如同截止閥一樣,流體壓力使閥瓣從閥座密封面上抬起,介質(zhì)回流導(dǎo)致閥瓣回落到閥座上,并切斷流動(dòng)。根據(jù)使用條件,閥瓣可以是全金屬結(jié)構(gòu),也可以是在閥瓣架上鑲嵌橡膠墊或橡膠環(huán)的形式。像截止閥一樣,流體通過升降式止回閥的通道也是狹窄的,因此通過升降式止回閥的壓力降比旋啟式止回閥大些,而且旋啟式止回閥的流量受到的限制很少。
鋼制球閥的選型選用須知
閘閥的選型選用須知
平板閘閥的選型選用須知
鋼制截止閥的選型選用須知
按調(diào)節(jié)介質(zhì)參數(shù)選用閥門
在生產(chǎn)過程中,為了使介質(zhì)的壓力、流量等參數(shù)符合工藝流程的要求,需要安裝調(diào)節(jié)機(jī)構(gòu)對(duì)上述參數(shù)進(jìn)行調(diào)節(jié)。調(diào)節(jié)機(jī)構(gòu)的主要工作原理,是靠改變閥門閥瓣與閥瓣與閥座間的流通面積,達(dá)到調(diào)節(jié)上述參數(shù)的目的。屬于這類閥門的統(tǒng)稱為控制閥,其中分為依靠介質(zhì)本身動(dòng)力驅(qū)動(dòng)的稱為自驅(qū)式控制閥如減壓閥、穩(wěn)壓閥等,凡領(lǐng)先上來動(dòng)力驅(qū)動(dòng)的(如電力 、壓縮空氣和液動(dòng)力)稱為他驅(qū)式控制閥,如電動(dòng)調(diào)節(jié)閥、氣動(dòng)調(diào)節(jié)閥和液動(dòng)調(diào)節(jié)閥等。
鋼制止回閥的選型選用須知
電站閥門的選型選用須知
其他閥門的選型選用須知
特種閥門選型選用須知
燃?xì)忾y門選型選用
用戶須知User's notice
1、閥門長(zhǎng)期存放時(shí),應(yīng)置于干燥通風(fēng)的室內(nèi),閥門通道兩端須用封蓋堵塞,定期對(duì)加工表面涂防銹油。
2、安裝前應(yīng)檢查核對(duì)閥門標(biāo)識(shí)是否與使用要求相符,檢查零部件是否完好無損,緊固件是否松動(dòng)。
3、閥門安裝前應(yīng)清除管道 內(nèi)的雜物(含閘板兩側(cè)的油紙)。
4、閥門吊運(yùn)安裝應(yīng)在兩法蘭頸(或吊環(huán)孔)使用吊具起吊,嚴(yán)禁手輪處起吊;
5、關(guān)閉:順時(shí)針旋轉(zhuǎn)手輪關(guān)閉閥門,直到手感到位,到位后手輪需反轉(zhuǎn)1/2~1圈(從防護(hù)罩觀察窗看到閥桿應(yīng)處于下列位置)。
6、開啟:逆時(shí)針旋轉(zhuǎn)手輪開啟閥門,直到手感到位為止(從防護(hù)罩觀察孔看到閥桿應(yīng)處于上部位置);
7、閥門使用前應(yīng)在各注脂嘴處注入密封脂,每半年至少加注一次;
8、排污螺孔處于閥門底部,用戶根據(jù)輸送介質(zhì)的需要在此處裝配排污閥;
9、嚴(yán)禁將本閥門作為節(jié)流閥使用(帶節(jié)流的閥門除外),只允許呈全開或全關(guān)狀態(tài);
10、嚴(yán)禁在閥門帶壓維修或敲打閥門各處;
1, when the valve is preserved for a long time, should put in the dry room that ventilates , both ends must be used and sealed and covered stopping up in the valve passway, apply and antirust the oil in processing the surface regularly.
2, should check before installation that checked whether the valve identification is in conformity with instructions for use, check whether the spare part stands intact , the fastener becomes flexible.
3, the valve should remove the incidental in the pipeline before installation (the oil paper including both sides of floodgate board).
4, valve is it is it is it should use the hoist to get up and hang in two flange neck (or rings hole ) to install to transport to hang, forbid the handwheel place to get up to hang;
5, close : The clockwise rotation handwheel closes the valve, until hands feel the location , the handwheel needs to turn 1/2 circles instead after putting in place (see from the viewing panel of protection cover valve stem should be in the following positions).
6, open an account: Rotate the handwheel counterclockwisly and open the valve, until hands feel the location (see from the peep hole of protection cover valve stem should be in the top position);
7, should run into sealed fat in every note fat mouth place before the valve is used , annotate at least once every half a year;
8, the blowdown spiral shell hole is in the valve bottom, users assemble the blowdown valve here according to the need for sending medium;
9, forbid regarding a valve as the choke valve to use (except the valve led and reduced expenditure), only permit to present and hold or close the state completely completely;
10, is it is it is it maintain or beat valve all office to pigeonhole to take in valve to forbid;
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文章標(biāo)題:閥門工程項(xiàng)目選型案例
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