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會對比不同結構閘閥的性能區別了嘛?

發布時間:2016-12-10  編輯:taike 查看:

閘閥
  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.
 
  如何分析不同結構閥門的性能:閘閥是一種在管道中被廣泛使用的閥門,主要用于連接和斷開介質。不用于調節介質流量,而是根據閥桿水平確定流量大小(如帶有刻度的火災彈性密封閘閥)。與其他閘閥相比,壓力,溫度,直徑等要求適用范圍廣。
 
  根據不同的內部結構可分為楔式單門板,彈性板式,雙門板,平行門式。
 
  根據不同的閥桿支撐可分為:明閘閘閥和暗閘閥。
 
  閥的主要優點是:
 
  1,閥門流體阻力小,由于閥體直線,介質流量不會改變方向,因此比其他閥門流量阻力小。
 
  2,密封性能比截止閥要好,與截止閥相比也要開閉。
 
  3,適用范圍廣,除蒸汽,油等介質外,也適合含有顆粒狀固體,介質粘度較大,也適用于低真空系統和閥門的排氣閥使用。
 
  4,閥門是一種雙重流量的閥門,不受介質流量的限制,因此適用于介質可改變管道的流動方向,也易于安裝。
 
  閥門的主要性能缺陷有:
 
  1,設計尺寸大,從長時間打開閥板需要升高到閥腔上部,閥板關閉,全部落入閥座,因此閥門板開閉,行程長,時間長。
 
  2,由于閥板和閥座兩個密封面在開閉過程中摩擦,使密封面容易劃傷,密封性能和使用壽命受到影響,且不易修復。
 
  幾種不同結構的閘閥的性能比較:
 
  (1)楔式閘閥
 
  A,結構比彈性閘閥更簡單
 
  B,在較高的溫度下,密封性能不如彈性閘閥或雙碟閥。
 
  C,高溫介質適合容易焦化。

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