(1) Threaded valve: with internal or external thread, and the thread connecting pipes .. (2) Flanged valves: a valve body with a flange connected to the pipe flange. (3) welding connection valve: Body with welding groove connected to pipe welding. (4) clamp connection valve: Body with jaws, pipe clamp connection. (5) connected to the valve sleeve: the pipes are connected to the ferrule. (6) of the clip connection valve: bolts directly to the valve and two pipes connected together in the...
（1）螺纹连接阀：阀体带有内螺纹或外螺纹，与管道螺纹连.. （2）法兰连接阀门：阀体带有法兰，与管道法兰连接。 （3）焊接连接阀门：阀体带有焊接坡口，与管道焊接连接。 （4）卡箍连接阀门：阀体带有夹口，与管道夹箍连接。 （5）卡套连接阀门：与管道采用卡套连接。 （6）对夹连接阀门：用螺栓直接将阀门及两头管道穿夹在一起的连接形式。
Structural characteristics of the valve closure member in accordance with the direction of the valve seat can be divided into: (1) gate-shaped cross-section: close member along the seat centers; such as the cut-off valve (2) tap and ball: closure member is a plunger or ball, rotating around the center line itself; if plug, ball (3) gate shaped: the closure of parts moving along the vertical seat centers; such as gate valves, gates and other (4) swing shape: Close the valve seat member...
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(1) small size valves: nominal diameter DN≤40mm valve. (2) in size valves: nominal diameter DN is 50 ~ 300mm valve. (3) large diameter valve: Nominal valve DN is 350 ~ 1200mm valve. (4) King size valves: nominal diameter of the valve DN≥1400mm
（1）小通径阀门：公称通径DN≤40mm的阀门。 （2）中通径阀门：公称通径DN为50～300mm的阀门。 （3）大通径阀门：公称阀门DN为350～1200mm的阀门。 （4）特大通径阀门：公称通径DN≥1400mm的阀门
Classification by driving into automatic valves, power-driven valves and manual valves Compressed air valve. Hydraulic valve: With oil liquid pressure driven valve. In addition there are more than a combination of several driving modes, such as gas - electric valve.
按驱动方式分类分为自动阀类、动力驱动阀类和手动阀类 压缩空气驱动的阀门。液动阀：借助油等液体压力驱动的阀门。 此外还有以上几种驱动方式的组合，如气-电动阀等。
(1) ultra-low temperature valve: for medium temperature t
（1）超低温阀：用于介质工作温度 t
(1) vacuum valve: the working pressure below standard atmospheric pressure valve. (2) Low pressure valve: nominal pressure PN ≤1.6Mpa valve. (3) pressure valve: PN nominal pressure is 2.5Mpa, 4.0Mpa, 6.4Mpa valve. (4) high-pressure valve: nominal pressure PN is 10.0Mpa ~ 80.0Mpa valve. (5) high pressure valve: nominal pressure PN≥100.0Mpa valve.
（1）真空阀：指工作压力低于标准大气压的阀门。 （2）低压阀：指公称压力PN ≤1.6Mpa 的阀门。 （3）中压阀：指公称压力PN 为2.5Mpa、4.0Mpa、6.4Mpa的阀门。 （4）高压阀：指公称压力PN 为10.0Mpa～80.0Mpa的阀门。 （5）超高压阀：指公称压力 PN≥100.0Mpa的阀门。
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