原文：
           黄铜截止阀是截止阀系列产品的一种。其主要材质是黄铜。黄铜也叫铜锌合金，最多的就是俗称的三七黄铜，也就是锌和纯铜的比例。因其有良好的机械性能和加工性被广泛饮用。黄铜截止阀在船用阀门上面应用比较广泛。具有普通截止阀所不具备的优点。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，蝶阀 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，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。

 　　截止阀的阀瓣一旦从关闭位置移开，它 球阀的阀座和阀瓣密封面之间就不再有接触，因而它的密封面机械磨损很小，故其密封性能是很好的，缺点是密封面间可能会夹住流动介质中的颗粒。但是，如果把阀瓣做成钢球或瓷球，这个问题也就迎韧而解了。由于大部分截止阀的阀座和阀瓣比较容易修理或更换，而且在修理或更换密封元件时无需把整个阀门从管线上拆卸下来，这在阀门和管线焊成一体的场合是非常适用的。

 　　由于介质通过此类阀门时的流动方向发生了变化，电磁阀 因此截止阀的最小流阻也较高于大多数其他类型的阀门。然而，根据阀体结构和阀杆相对于进、出口通道的布局，这种状况是可以改善的。同时.由于截止阀瓣开与关之间行程小，密封面又能承受多次启闭，因此它很适用于需要频繁开关的场合。

 　　截止阀可用于大部分介质流程系统中。止回阀已研制出满足石化、电力、冶金、城建、化工等部门各种用途的多种形式的截止阀。

 　　截止阀的使用极为普遍，但由于开启和关闭力矩较大、结构长度较长，通常公称通径都限制在250mm以下，也有到400mm的，但选用时需特别注意进出口方向。一般15Omm以下的截止阀介质大都从阀瓣的下方流入，而2O0mm以上的截止阀介质大都从阀瓣的上方流入。这是考虑到阀门的关闭力矩所致。为了减小开启或关闭力矩，一般2O0mm以上的截止阀都设内旁通或外旁通阀门。

 　　截止阀最明显的优点是：

　　( l)在开启和关闭过程中，闸阀 由于阀瓣与阀体密封面间的摩擦力比闸阀小，因而耐磨.

　　( 2)开启高度一般仅为阀座通道直径的l / 4，因此比闸阀小得多。

　　( 3)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。但是，截止阀的缺点也是不容忽视的。其缺点主要是流阻系数比较大，因此造成压力损失，特别是在液压装置中，这种压力损失尤为明显。

“ About Brass Stop Valve ”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：
            Brass stop valve is a valve products. The main material is brass. Brass, zinc alloy, also called up to the March 7 is commonly known as brass, that is, the ratio of zinc and copper. Because of its good mechanical properties and processability are widely consumed. Brass valve above the valve in the ship used widely. General cut-off valve with the advantages not available. Valve is closed parts (disc) moving along theBALL VALVES 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 flow regulation. Therefore, this type of valve is suitable for cutting or adjustment, and throttle use. Once the cut-off valve disc away from the CHECK VALVESclosed position, its seat and disc sealing surface contact between the longer, so it's sealing surface mechanical wear small, so the sealing performance is very good, disadvantage sealing surface may be clamped between the flow of medium particles. However, if the flap valve made of steel ball or balls, the problems will meet tough but understanding. As most of the closing valve seat and disc easier to repair or replace, and repair or replacement of seals in when the valves do not need to be removed from the pipeline, which in the valve and pipeline welding into one of the occasions are very applicable of. As the medium through the valve when the flow direction of such a change, so the minimum cut-off valve flow resistance is also higher in most other types of valves. However, according to body structure and the valve stem relative to the inlet and outlet channels of distribution, this situation can be improved. At the same time. As the flap valve and closure of travel between the small, sealed surface can withstand repeated opening and closing, so it is suitable for occasions that require frequent switching. Valve can be used for most of the media flow systems. Has been developed to meet the petrochemical, electric power, metallurgy, urban construction, chemical and other departments for various uses of the various forms of cut-off valve. The use of cut-off valve is very common, BUTTERFLY VALVESbut a larger opening and closing moments, the structure length is longer, usually nominal diameter is limited to 250mm below has to 400mm, but the selected direction when the need to pay special attention to the import and export. The following general 15Omm Most medium closing valve below the inflow from the disc, but 2O0mm valve above most medium flows from the top of the valve flap.GATE VALVES This is because the torque caused by the closure of the valve. In order to reduce the torque on or off, the general 2O0mm more bypass valves are located inside or outside the bypass valve. The most obvious advantage of cut-off valve is: (L) in the opening and closing process,GLOBE VALVE because the valve flap and valve sealing surface friction forces between the gate is small, and therefore wear. (2) generally only open seat height channel diameter l / 4, so much smaller than the gate. (3) in the valve body and disc are usually only one sealing surface, and thus comparison of manufacturing processes, and easy maintenance. However, the cut-off valve defects can not be ignored. The disadvantages are relatively large flow resistance coefficient, the resulting pressure loss, especially in the hydraulic device, this pressure loss is particularly evident.

原文来源：http://www.1jiezhifa.com/

2010-08-25 07:01

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