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发电厂阀门基础知识培训(全新课件).ppt

  • 2026-05-13 21:29:16
发电厂阀门基础知识培训(全新课件).ppt
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按用途和作用分类:

截断类:主要用于截断或接通介质流。如闸阀、截止阀、球阀、碟阀、旋塞阀、隔膜阀

止回类:用于阻止介质倒流。包括各种结构的止回阀。

调节类:调节介质的压力和流量如减压阀、调压阀、节流阀

安全类: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。

分配类:改变介质流向、分配介质,如三通旋塞、分配阀、滑阀等

特殊用途:如疏水阀、放空阀、排污阀等

按阀体材料分类:

非金属阀门:如陶瓷阀门、玻璃钢阀门、塑料阀门

金属材料阀门:如铸铁阀门、碳钢阀门、铸钢阀门、低合金钢阀门、高合金钢阀门及铜合金阀门等。

按公称通径分

根据阀门的公称通径可分:

小口径阀门:公称通径DN<40mm的阀门。

中口径阀门:公称通径DN50~300mm的阀门。

大口径阀门:公称通径DN350~1200mm的阀门。

特大口径阀门:公称通径DN≥1400mm的阀门

按与管道连接方式分可分为:

法兰连接阀门:阀体带有法兰,与管道采用法兰连接的阀门。

螺纹连接阀门:阀体带有螺纹,与管道采用螺纹连接的阀门。

焊接连接阀门:阀体带有焊口,与管道采用焊接连接的阀门。

夹箍连接阀门:阀体上带夹口,与管道采用夹箍连接的阀门。

卡套连接阀门:采用卡套与管道连接的阀门。

通用分类法 

这种分类方法既按原理、作用又按结构划分,是目前国际、国内最常用的分类方法。一般分:

闸阀、截止阀、节流阀、仪表阀、柱塞阀、隔膜阀、旋塞阀、球阀、蝶阀、止回阀、减压阀安全阀、疏水阀、调节阀、底阀、过滤器、排污阀等。

阀门的维护保养

对阀门的维护,可分两种情况;保管维护和使用维护。

(一)保管维护

保管不当是阀门损坏的重要原因之一。

阀门保管,不能乱堆乱垛,小阀门放在货架上,大阀门可在库房地面上整齐排列,不要让法兰连接面接触地面。保护阀门不致碰坏。

短期内暂不使用的阀门,应取出石棉填料,以免产生电化学腐蚀,损坏阀杆。

对刚进库的阀门,要进行检查,如在运输过程中进了雨水或污物,要擦试干净,再予存放。

阀门进出口要用蜡纸或塑料片封住,以防进去脏东西。

对能在大气中生锈的阀门加工面要涂防锈油,加以保护。

放置室外的阀门,必须盖上油毡或苫布之类防雨、防尘物品。存放阀门的仓库要保持清洁干燥。

(二)使用维护

使用维护的在于延长阀门寿命和保证启闭可靠。

阀杆螺纹经常与阀杆螺母摩擦,要涂一点黄油或石墨粉,起润滑作用。

不经常启闭的阀门,要定期转动手轮,对阀杆螺纹加润滑剂,以防咬住。  

室外阀门,要对阀杆加保护套,以防雨、雪、尘土锈污。

如阀门系机械传动,要按时对变速箱添加润滑油并保持阀门的清洁。

不要依靠阀门支持其它重物,不要在阀门上站立。

阀杆,特别是螺纹部分,要经常清洁并添加新的润滑剂,防止尘土中的硬杂物,磨损螺纹和阀杆表面,影响使用寿命。

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  1. CONNECT:[ UseTime:0.000922s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.039110s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003824s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001734s ]
  6. SELECT * FROM `set` [ RunTime:0.000589s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001643s ]
  8. SELECT * FROM `article` WHERE `id` = 498477 LIMIT 1 [ RunTime:0.010088s ]
  9. UPDATE `article` SET `lasttime` = 1778686821 WHERE `id` = 498477 [ RunTime:0.049447s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.016381s ]
  11. SELECT * FROM `article` WHERE `id` < 498477 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.028199s ]
  12. SELECT * FROM `article` WHERE `id` > 498477 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005955s ]
  13. SELECT * FROM `article` WHERE `id` < 498477 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015086s ]
  14. SELECT * FROM `article` WHERE `id` < 498477 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.012315s ]
  15. SELECT * FROM `article` WHERE `id` < 498477 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005337s ]
0.293685s