原文：
锻钢法兰截止阀是指关闭件(阀瓣)沿阀座中心线移动的阀门。根据阀瓣的这种移动形式，阀座通口的变化是与阀瓣行程成正比例关系。由于该类阀门的阀杆开启或关闭行程相对较短，而且具有非常可靠的切断功能，球阀 又由于阀座通口的变化与阀瓣的行程成正比例关系，非常适合于对流量的调节。因此，这种类型的阀门非常适合作为切断或调节以及节流使用。

 　　其选用原则是：

　　1、高温、高压介质的管路或装置上宜选用截止阀。截止阀如火电厂、核电站，石油化工系统的高温、高压管路上。

　　2、管路上对流阻要求不严的管路上。闸阀即对压力损失考虑不大的地方。

 　　3、小型阀门可选用针阀、仪表阀、取样阀、压力计阀等。

　　4、有流量调节或压力调节，但对调节精度要求不高，而且管路直径又比较小，如公称通经≤50mm的管路上，宜选用。

　　5、合成工业生产中的小化肥和大化肥宜选用公称压力蝶阀PN160公称压力16MPa或PN320公称压力32MPa的高压角式截止阀或高压角式节流阀。

 　　6、氧化铝拜耳法生产中的脱硅车间、易结焦的管路上，易选用阀体分开式、阀座可去处的、硬质合金密封副的直流式截止阀或直流式节流阀。

　　7、城市建设中的供水、供热工程上，止回阀公称通经较小的管路，可选用截止、平衡阀或柱塞阀，如公称通经小于150mm的管路上。

    　　最明显的优点是：在开启和关闭过程中，由于阀瓣于阀体密封面间的摩擦力比闸阀小，因而耐磨。开启高度一般仅为阀座通道直径的1/4，因此比闸阀小的多。通常在阀体和阀瓣上只有一个密封面，因而制造工艺性比较好，便于维修。公称压力或压力级：PN1.0-16.0MPa、ANSI CLASS 150-900、JIS10-20K公称通径或口径：DN10～500、NPS 1/2～36"连接方式：法兰、对焊、螺纹等适用温度：-196℃～700℃驱动方式：手动、伞齿轮传动、气动、电动、液动、气液联动、电液联动阀体材料：WCB、ZG1Cr18Ni9Ti、ZG1Cr18Ni12Mo2Ti、CF8(304)、CF3(304L)、CF8M(316)、CF3M(316L)、Ti。选用不同的材质，可分别适用于水、蒸汽、油品、硝酸、醋酸、氧化性介质、尿素等多种介质。

“ Forged steel valve flange knowledge ”是由中国截止阀网提供的阀门新闻，译文仅供参考。另外，中国截止阀网还提供相关产品搜索： 直通(流)式截止阀、 角式截止阀、 电站截止阀、 高压截止阀、 波纹管截止阀。等

译文：
          Forged steel flange globe valve is closed parts (disc) moving along the centerline of the valve seat. According to this mobile form of flap valve, the valve seat through the mouth of change is directly proportional relationship between the valve flap travel. As such the valve stem to open or close the trip is relatively short, but very reliable cut off function, and because changes in the valve seat and valve openings of the proportional relationship between the trip valve is very suitable for flowScrew pumps regulation. Therefore, this type of valve is suitable for cutting or adjustment, and throttle use. The selection principle is: 1, high temperature, high pressure media should use pipe or valve device. Fiery power plants, nuclear power plants, petrochemicalSuber-water pumps system, high temperature, high pressure pipeline. 2, pipeline flow resistance strict with the pipeline. Consideration of the pressure loss is not the place. 3, a small needle valve can be used, Magnetic pumps instrument valves, sampling valves, pressure gauge valve. 4, a flow control or pressure regulation, but regulation less precision, and pipe diameter and relatively small, such as the nominal path by ≤ 50mm pipe should be chosen. 5, synthetic industrial production of Self-priming pumpssmall and large chemical fertilizer should use nominal pressure PN160 PN320 nominal pressure PN 16MPa or 32MPa high-pressure angle-type valve or high pressure angle-type throttle. 6, Bayer alumina production plant in desiliconization and easy way to control coking, easy to use separate style valve, valve seat to place, and carbide seal pair of DC-type or DC-type throttle valve. 7, urban construction, water supply, heat supply engineering, nominal pipe by small, can use cut-off, balancing valve or piston valve, such as nominal by less than 150mm of the pipeline. The most obvious advantages are: the opening and closing process, because the valve flap in the valve body sealing surface friction forces between the gate is small, and therefore wear. Generally only open seat height channel diameter of 1 / 4, so much smaller than theChemical pumps gate. Body and disc usually is only one sealing surface, and thus comparison of manufacturing processes, and easy maintenance. Nominal pressure or stress level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K nominal diameter or caliber: DN10 ~ 500, NPS 1 / 2 ~ 36 "Connection: flange, welding, thread, etc. Applicable temperature: -196 ℃ ~ 700 ℃ Drive Mode: Manual, bevel gear, pneumatic, electric, hydraulic, Pneumatic, electro-hydraulic linkage Body Material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L ), CF8M (316), CF3M (316L), Ti. use different materials, can be separately applied to water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.

原文来源：http://www.1jiezhifa.com/

2010-08-25 07:00

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