Valve type and valve classification

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Valve type and valve classification

Valves wide range of uses, a wide range of valve classification difficulties are also increasing, in order to better understand the valve products, multi-instrument company special common valve classification, the type of valve is based on the actual conditions of the scene classification, and part Manufacturers choose their own special circumstances and the use of different purposes and the role of the principle is different. The total can be divided into two categories:

The first type of automatic valve: rely on the media (liquid, gas) their own ability to operate the valve. Such as check valve, safety valve, regulating valve, steam trap, pressure reducing valve.

The second type of drive valve: With manual, electric, hydraulic, pneumatic to manipulate the action of the valve, butterfly valve, gate valve, globe valve, throttle, plug valves.

At present, the most commonly used international and domestic valve classification methods are the following:

First, according to structural features, according to the closure of the valve seat relative to the direction of movement can be divided:

1. Sectional shape: The closure moves along the center of the seat.

2. Gates: Closure moves along the vertical seat center.

3. Tap and Sphere: The closure is a plunger or ball that rotates around its centerline.

4. Turn-on; the closing piece rotates around the shaft outside the seat.

5. Dish: Closure of the disc, rotating around the inside of the valve seat.

6. Slide valve: Closure slide in a direction perpendicular to the passage.

Second, according to the driving method, according to different driving methods can be divided into:

1. Electric: driven by a motor or other electrical device.

2. Powered by: (water, oil) to drive.

3. Pneumatic; with compressed air to drive the valve open and close.

4. Manual: With the handwheel, handle, lever or sprocket, a manpower-driven, transmission torque, equipped with worm gear, gear and other deceleration devices.

Third, according to use, according to the different uses of the valve can be divided into:

1. Broken with: used to connect or cut off the pipeline medium, such as globe valve, gate valve, ball valve, butterfly valve.

2. Non-return: used to prevent media backflow, such as check valve.

3. Adjustment: used to regulate the medium pressure and flow, such as regulating valve, pressure reducing valve.

4. Distribution: used to change the media flow, distribution of media, such as three-way cock, distribution valve, slide valve.

5. Safety valve: When the medium pressure exceeds the specified value, it is used to discharge excess medium to ensure the safety of piping system and equipment, such as safety valve and accident valve.

6. Other special purposes: such as steam traps, vent valves, sewage valves.



阀门常见分类

    阀门是流体输送系统中的控制部件,具有截止、调节、导流、防止逆流、稳压、分流或溢流泄压等功能。用于流体控制系统的阀门,从最简单的截止阀到极为复杂的自控系统中所用的各种阀门,其品种和规格相当繁多。阀门可用于控制空气、水、蒸汽、各种腐蚀性介质、泥浆、油品、液态金属和放射性介质等各种类型流体的流动。阀门根据材质还分为铸铁阀门,铸钢阀门,不锈钢阀门,铬钼钢阀门,铬钼钒钢阀门,双相钢阀门,塑料阀门,非标订制等阀门材质。


     随着社会的发展,阀门的应用范围也越来越广,随之增多的就是阀门的种类,千变万化,制造商可以根据客户的要求制造出符合使用标准的阀门。以下是根据不同的使用特点对阀门进行了划分:


一、阀门总的可分两大类:

     第一类自动阀门:依靠介质(液体、气体)本身的能力而自行动作的阀门。

                     如止回阀、安全阀、调节阀、疏水阀、减压阀等。

     第二类驱动阀门:借助手动、电动、液动、气动来操纵动作的阀门。如闸

                     阀,截止阀、节流阀、蝶阀、球阀、旋塞阀等。  


二、按结构特征,根据关闭件相对于阀座移动的方向可分:

     1.截门形:关闭件沿着阀座中心移动;

     2.闸门形:关闭件沿着垂直阀座中心移动;

     3.旋塞和球形:关闭件是柱塞或球,围绕本身的中心线旋转;

     4.旋启形:关闭件围绕阀座外的轴旋转;

     5.碟形:关闭件的圆盘,围绕阀座内的轴旋转;

     6.滑阀形:关闭件在垂直于通道的方向滑动。  


三、按用途,根据阀门的不同用途可分:

     1.开断用:用来接通或切断管路介质,如截止阀、闸阀、球阀、蝶阀等。

     2.止回用:用来防止介质倒流,如止回阀。

     3.调节用:用来调节介质的压力和流量,如调节阀、减压阀。

     4.分配用:用来改变介质流向、分配介质,如三通旋塞、分配阀、滑阀等。

     5.安全阀:在介质压力超过规定值时,用来排放多余的介质,保证管路系

               统及设备安全,如安全阀、事故阀。                                                                                                                                                          

     6.其他特殊用途:如疏水阀、放空阀、排污阀等。


四、按驱动方式,根据不同的驱动方式可分:

     1.手动:借助手轮、手柄、杠杆或链轮等,有人力驱动,传动较大力矩时

             装有蜗轮、齿轮等减速装置。

     2.电动:借助电机或其他电气装置来驱动。

     3.液动:借助(水、油)来驱动。

     4.气动:借助压缩空气来驱动。


五、按压力,根据阀门的公称压力可分:

     1.真空阀:绝对压力<0.1Mpa 即 760mm 汞柱高的阀门,通常用 mm 汞柱      

               或mm水柱表示压力。

     2.低压阀:公称压力 PN≤1.6Mpa 的阀门(包括 PN≤1.6MPa 的钢阀)

     3.中压阀:公称压力 PN2.5—6.4MPa 的阀门。

     4.高压阀:公称压力 PN10.0—80.0MPa 的阀门。

     5.超高压阀:公称压力 PN≥100.0MPa 的阀门。


六、按介质的温度分,根据阀门工作时的介质温度可分:

     1.普通阀门:适用于介质温度-40℃~425℃的阀门。

     2.高温阀门:适用于介质温度 425℃~600℃的阀门。

     3.耐热阀门:适用于介质温度 600℃以上的阀门。

     4.低温阀门:适用于介质温度-150℃~ -40℃的阀门。

     5.超低温阀门:适用于介质温度-150℃以下的阀门。


七、按公称通径分,根据阀门的公称通径可分:

     1.小口径阀门:公称通径 DN<40mm 的阀门。

     2.中口径阀门:公称通径 DN50~300mm 的阀门。

     3.大口径阀门:公称通径 DN350~1200mm 的阀门。

     4.特大口径阀门:公称通径 DN≥1400mm 的阀门。


八、按与管道连接方式分,根据阀门与管道连接方式可分:

     1.法兰连接阀门:阀体带有法兰,与管道采用法兰连接的阀门。

     2.螺纹连接阀门:阀体带有内螺纹或外螺纹,与管道采用螺纹连接的阀门。

     3.焊接连接阀门:阀体带有焊口,与管道采用焊接连接的阀门。

     4.夹箍连接阀门:阀体上带有夹口,与管道采用夹箍连接的阀门。

     5.卡套连接阀门:采用卡套与管道连接的阀门。




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