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会对比 不同结构闸阀的性能区别了嘛?

发布时间:2016-12-10  编辑:taike 查看:

闸阀
  How to analyze the performance of different structure of valve:gate valve is a valve is widely used in the pipeline,mainly to connect and disconnect the media.Not for regulating the flow of media,but to determine the size of the flow according to the level of stem down(such as fire elastic sealing gate valve with scale).Compared to other gate valve for pressure,temperature,diameter and other requirements of the applicable scope is wide.
 
  According to the different internal structure can be divided into:wedge type single gate plate,elastic plate type,double gate plate,parallel gate type.
 
  According to the different stem support can be divided into:the bright pole gate valve and the dark bar gate valve.
 
  The main advantages of the valve are:
 
  1,the valve fluid resistance is small,because the valve body is straight,medium flow does not change direction,and therefore more than other valve flow resistance to be small.
 
  2,the sealing performance is better than the cut-off valve,open and close also compared with the cut-off valve.
 
  3,wide applicable range,except for the steam,oil and other media,is also suitable for containing granular solids and the medium viscosity is bigger,also suitable for low vacuum system and vent valve of valve to use.
 
  4,the valve is a dual flow of the valve,not subject to the flow of media restrictions,and therefore apply to the media may change the flow direction of the pipeline,but also easy to install.
 
  The main performance of the valve defects are:
 
  1,the size of the design is high,from a long time to open the valve plate needs to be raised to the upper part of the valve cavity,and the valve plate is closed down and all fall into the valve seat,so the valve plate open and close the trip,a long time.
 
  2,due to the valve plate and valve seat of the two sealing surface in the process of opening and closing friction,so the sealing surface is easy to scratch,sealing performance and service life are affected,and is not easy to repair.
 
  Performance comparison of several kinds of gate valves with different structures:
 
  (1)wedge gate valve
 
  A,the structure is simpler than the elastic gate valve
 
  B,at a higher temperature,the sealing performance is not as good as the elastic gate valve or double disc valve.
 
  C,high temperature medium suitable for easy coking.
 
  如何分 析不同结构阀门的性能:闸阀是 一种在管道中被广泛使用的阀门,主要用 于连接和断开介质。不用于调节介质流量,而是根 据阀杆水平确定流量大小(如带有 刻度的火灾弹性密封闸阀)。与其他闸阀相比,压力,温度,直径等 要求适用范围广。
 
  根据不 同的内部结构可分为楔式单门板,弹性板式,双门板,平行门式。
 
  根据不 同的阀杆支撑可分为:明闸闸阀和暗闸阀。
 
  阀的主要优点是:
 
  1,阀门流体阻力小,由于阀体直线,介质流 量不会改变方向,因此比 其他阀门流量阻力小。
 
  2,密封性 能比截止阀要好,与截止 阀相比也要开闭。
 
  3,适用范围广,除蒸汽,油等介质外,也适合 含有颗粒状固体,介质粘度较大,也适用 于低真空系统和阀门的排气阀使用。
 
  4,阀门是 一种双重流量的阀门,不受介质流量的限制,因此适 用于介质可改变管道的流动方向,也易于安装。
 
  阀门的 主要性能缺陷有:
 
  1,设计尺寸大,从长时 间打开阀板需要升高到阀腔上部,阀板关闭,全部落入阀座,因此阀门板开闭,行程长,时间长。
 
  2,由于阀 板和阀座两个密封面在开闭过程中摩擦,使密封面容易划伤,密封性 能和使用寿命受到影响,且不易修复。
 
  几种不 同结构的闸阀的性能比较:
 
  (1)楔式闸阀
 
  A,结构比 弹性闸阀更简单
 
  B,在较高的温度下,密封性 能不如弹性闸阀或双碟阀。
 
  C,高温介 质适合容易焦化。

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