5795900620安沃馳閥組電磁閥

5795900620安沃馳閥組電磁閥

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電磁閥選型首先應(yīng)該依次遵循安全性，可靠性，適用性，經(jīng)濟(jì)性四大原 則，其次是根據(jù)六個方面的現(xiàn)場工況（即管道參數(shù)、流體參數(shù)、壓力參數(shù)、電氣參數(shù)、動作方式、特殊要求進(jìn)行選擇）。

選型依據(jù)：

1、根據(jù)管道參數(shù)選擇電磁閥的：通徑規(guī)格（即DN）、接口方式

1）按照現(xiàn)場管道內(nèi)徑尺寸或流量要求來確定通徑（DN）尺寸；

2）接口方式，一般>DN50要選擇法蘭接口，≤DN50則可根據(jù)用戶需要自由選擇。

2、根據(jù)流體參數(shù)選擇電磁閥的：材質(zhì)、溫度組

1）腐蝕性流體：宜選用耐腐蝕電磁閥和全不銹鋼；食用超凈流體：宜選用食品級不銹鋼材質(zhì)電磁閥；

2）高溫流體：要選擇采用耐高溫的電工材料和密封材料制造的電磁閥，而且要選擇活塞式結(jié)構(gòu)類型的；

3）流體狀態(tài)：大至有氣態(tài)，液態(tài)或混合狀態(tài)，特別是口徑大于DN25時一定要區(qū)分開來；

4）流體粘度：通常在50cSt以下可任意選擇，若超過此值，則要選用高粘度電磁閥。

3、根據(jù)壓力參數(shù)選擇電磁閥的：原理和結(jié)構(gòu)品種

1）公稱壓力：這個參數(shù)與其它通用閥門的含義是一樣的，是根據(jù)管道公稱壓力來定；

2）工作壓力：如果工作壓力低則必須選用直動或分步直動式原理；低工作壓差在0.04Mpa以上時直動式、分步直動式、先導(dǎo)式均可選用。

4、電氣選擇：電壓規(guī)格應(yīng)盡量優(yōu)先選用AC220V、DC24較為方便。

5、根據(jù)持續(xù)工作時間長短來選擇：常閉、常開、或可持續(xù)通電

1）當(dāng)電磁閥需要長時間開啟，并且持續(xù)的時間多于關(guān)閉的時間應(yīng)選 用常開型；

2）要是開啟的時間短或開和關(guān)的時間不多時，則選常閉型；

3）但是有些用于安全保護(hù)的工況，如爐、窯火焰監(jiān)測，則不能選常開的，應(yīng)選可長期通電型。

6、根據(jù)環(huán)境要求選擇輔助功能：防爆、止回、手動、防水霧、水淋、潛水。

選型原則

安全性：

1、腐蝕性介質(zhì)：宜選用塑料王電磁閥和全不銹鋼；對于強(qiáng)腐蝕的介 質(zhì)必須選用隔離膜片式。中性介質(zhì)，也宜選用銅合金為閥殼材料的電磁閥，否則，閥殼中常有銹屑脫落，尤其是動作不頻繁的場合。氨用閥則不能采用銅材。

2、爆開性環(huán)境：必須選用相應(yīng)防爆等級產(chǎn)品，露天安裝或粉塵多場合應(yīng)選用防水，防塵品種。

3、電磁閥公稱壓力應(yīng)超過管內(nèi)高工作壓力。

適用性：

1、介質(zhì)特性

1）質(zhì)氣，液態(tài)或混合狀態(tài)分別選用不同品種的電磁閥；

2）介質(zhì)溫度不同規(guī)格產(chǎn)品，否則線圈會燒掉，密封件老化，嚴(yán)重影響壽命命；

3）介質(zhì)粘度，通常在50cSt以下。若超過此值，通徑大于15mm時，用多功能電磁閥；通徑小于15mm時，用高粘度電磁閥。

4）介質(zhì)清潔度不高時都應(yīng)在電磁閥前配裝反沖過濾閥，壓力低時，可選用直動膜片式電磁閥；

5）介質(zhì)若是定向流通，且不允許倒流，需用雙向流通；

6）介質(zhì)溫度應(yīng)選在電磁閥允許范圍之內(nèi)。

2、管道參數(shù)

1）根據(jù)介質(zhì)流向要求及管道連接方式選擇閥門通口及型號；

2）根據(jù)流量和閥門Kv值選定公稱通徑，也可選同管道內(nèi)徑；

3）工作壓差：低工作壓差在0.04Mpa以上是可選用間接先導(dǎo)式；低工作壓差接近或小于零的必須選用直動式或分步直接式。

3、環(huán)境條件

1）環(huán)境的高和低溫度應(yīng)選在允許范圍之內(nèi)；

2）環(huán)境中相對濕度高及有水滴雨淋等場合，應(yīng)選防水電磁閥；

3）環(huán)境中經(jīng)常有振動，顛簸和沖擊等場合應(yīng)選特殊品種，例如船用電磁閥；

4）在有腐蝕性或爆開性環(huán)境中的使用應(yīng)優(yōu)先根據(jù)安全性要求選用耐發(fā)蝕型；

5）環(huán)境空間若受限制，需選用多功能電磁閥，因其省去了旁路及三只手動閥且便于在線維修。

4、電源條件

1）根據(jù)供電電源種類，分別選用交流和直流電磁閥。一般來說交流電源取用方便；

2）電壓規(guī)格用盡量優(yōu)先選用AC220V.DC24V；

3）電源電壓波動通常交流選用 %10%.-15%，直流允許±%10左右，如若超差，須采取穩(wěn)壓措施；

4）應(yīng)根據(jù)電源容量選擇額定電流和消耗功率。須注意交流起動時VA值較高，在容量不足時應(yīng)優(yōu)先選用間接導(dǎo)式電磁閥。

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