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管道倒流防止阀价格管道倒流防止阀价格供用户或设计院工程项目做预算产品名称通径dn3240506580100125150hs41x管道倒流防止阀200250300350400450500600700工作压力(mpa)
1.6(z)
2.5(c)75082590097512001575210025503600525076509300133501590022500315009009901125117014401890252030754350630091501117515900190502700037800其它水力控制阀价格产品名称
1.0/
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61.0/
1.6口径(铸钢,
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1251.0/
1.
61.0/
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1.6口径(铸钢,
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1.0/
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61.0/
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1.0/
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61.0/
1.6口径(铸钢,
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8001.0/
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61.0/
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62.5mpa(铸铁)(铸钢,球墨)6756756756757509001050127516502325322544255550705082509300130502130030450825825825825900112512751650195026253900525063007950900010200150002475042000900900900900975120013501800210027754050555066008250945010800157502550043950600x电动控制阀产品名称
1.0/
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1.6口径(铸钢,
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61.0/
1.6口径(铸钢,
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1.0/
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61.0/
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1.6口径(铸钢,
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8001.0/
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61.0/
1.6c
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2501.0/
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6421.
5432478.
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532825869.58475200x减压阀
一、阀门的选型步骤第10页共13页
1.明确阀门在设备或装置中的用途,确定阀门的工作条件适用介质、工作压力、工作温度等等
2.确定与阀门连接管道的公称通径和连接方式法兰、螺纹、焊接等
3.确定操作阀门的方式手动、电动、电磁、气动或液动、电气联动或电液联动等
4.根据管线输送的介质、工作压力、工作温度确定所选阀门的壳体和内件的材料灰铸铁、可锻铸铁、球墨铸铁、碳素钢、合金钢、不锈耐酸钢、铜合金等
5.确定阀门的型式闸阀、截止阀、球阀、蝶阀、节流阀、安全阀、减压阀、蒸汽疏水阀、等
6.确定阀门的参数对于自动阀门,根据不同需要先确定允许流阻、排放能力、背压等,再确定管道的公称通径和阀座孔的直径
7.确定所选用阀门的几何参数结构长度、法兰连接形式及尺寸、开启和关闭后阀门高度方向的尺寸、连接的螺栓孔尺寸和数量、整个阀门外型尺寸等
8.利用现有的资料阀门产品目录、阀门产品样本等选型适当的阀门产品
二、阀门的选型依据
1.所选用阀门的用途、使用工况条件和操纵控制方式
2.工作介质的性质工作压力、工作温度、腐蚀性能,是否含有固体颗粒,介质是否有毒,是否是易燃、易爆介质,介质的黏度等等第11页共13页
3.对阀门流体特性的要求流阻、排放能力、流量特性、密封等级等等
4.安装尺寸和外形尺寸要求公称通径、与管道的连接方式和连接尺寸、外形尺寸或重量限制等
⑤对阀门产品的可靠性、使用寿命和电动装置的防爆性能等的附加要求(在选定参数时应注意如果阀门要用于控制目的,必须确定如下额外参数操作方法、最大和最小流量要求、正常流动的压力降、关闭时的压力降、阀门的最大和最小进口压力)根据上述选型阀门的依据和步骤,合理、正确地选型阀门时还必须对各种类型阀门的内部结构进行详细了解,以便能对优先选用的阀门做出正确的抉择管道的最终控制是阀门阀门启闭件控制着介质在管道内的流束方式,阀门流道的形状使阀门具备一定的流量特性,在选型管道系统最适合安装的阀门时必须考虑到这一点
三、阀门选型原则
1.截止和开放介质用的阀门流道为直通式的阀门,其流阻较小,通常选型作为截止和开放介质用的阀门向下闭合式阀门(截止阀、柱塞阀)由于其流道曲折,流阻比其他阀门高,故较少选用在允许有较高流阻的场合,可选用闭合式阀门
2.控制流量用的阀门通常选型易于调节流量的阀门作为控制流量用向下闭合式阀门(如截止阀)适于这一用途,因为它的阀座尺寸与关闭件的行程之间成正比关系旋转式阀门(旋塞阀、蝶阀、球阀)和挠曲阀体式阀门(夹紧阀、隔膜阀)也可用于节流控制,但通常只能在有限的阀门口径范围内适用闸阀是以圆盘形闸板对圆形阀第12页共13页座口做横切运动,它只有在接近关闭位置时,才能较好地控制流量,故通常不用于流量控制
3.换向分流用的阀门根据换向分流的需要,这种阀门可有三个或更多的通道旋塞阀和球阀较适用于这一目的,因此,大部分用于换向分流的阀门都选取这类阀门中的一种但是在有些情况下,其他类型的阀门,只要把两个或更多个阀门适当地相互连接起来,也可作换向分流用
4.带有悬浮颗粒的介质用阀门当介质中带有悬浮颗粒时,最适于采用其关闭件沿密封面的滑动带有擦拭作用的阀门如果关闭件对阀座的来回运动是竖直的,那末就可能夹持颗粒,因此这种阀门除非密封面材料可以允许嵌入颗粒,否则只适用于基本清洁的介质球阀和旋塞阀在启闭过程中对密封面均有擦拭作用,故适宜用在带有悬浮颗粒的介质中目前,无论在石油、化工,还是在别的行业的管道系统,阀门应用、操作频率和服务千变万化,要控制或杜绝那怕是低微的泄漏,最重要、最关键的设备还数阀门管道的最终控制是阀门,阀门在各个领域的服务和可靠表现是独一无二的第13页共13页。