旋塞閥概述 Plug valve summary

 旋塞閥構造簡略，啟閉敏捷，流體阻力小。這些年作為歷被大家選用的閥門之一，不光沒有被球閥等型式的閥門所替代，反而商場出現愈來愈火爆的趨勢。

旋塞閥是關閉件或柱塞形的旋轉閥，通過旋轉90度使閥塞上的通道口與閥體上的通道口一樣或分隔，完結敞開或關閉的一種閥門。旋塞閥的閥塞的形狀可成圓柱形或圓錐形。在圓柱形閥塞中，通道一般成矩形；而在錐形閥塞中，通道成梯形。

 Plug valve use Plug with holes as valve disc,turn disc and stem to open and shut valve.

Structure plug valve is simple,speedy open and shut,small flow resi-stance.lt's the earliest valve used in the history for human,it's not only no instead of by another type valves such as ball valve,but also have more market in the future.

結構特點 Structure features

1. 閥體進出口端窗口設計為雙道溝槽密封環結構，旋塞在旋轉過程中，其密封副件的密封比壓在不斷變化，直至到達全開關位置時，產生足夠的密封比壓，密封副達到零泄漏。

2. 雙道溝槽密封環既可以使PTFE襯套穩固在閥體內不產生位移，又可吸收由于溫差變化引起襯套產生的微量變形，同時襯套與旋塞之間產生有力的擦拭作用，又提高了密封面的使用壽命。

3. 塞軸上部采用了一個PTFE膜片和O型圈與調節墊片組合，既可以調整密封面的密封比壓，使塞子轉動靈活，又能保證進、出口端和中法蘭連接端的密封。

4. 整個密封過程可近似認為與管道內壓力無關。

5. PTFE襯套內，根據使用溫度和工作介質采用不同襯料的填充物，潤滑好、壽命長。

1. Design of valve inlet and outlet bore is double path groove seal ring structure,seal pressure  rating is changing between seal component,till ti full open and close position,then produce enough seal pressure rating,no any leakage of seal component.
2.  Double path groove seal ring structure not only make PTFE lining fixed in the body and can't remove,but also increase powerful friction between lining layer and plug,to enhance the using life of seal face.
3. ln the top of plug is a component consists of PTFE diaphragm,O ring and modulating gasket,it can modulate seal face and seal pressure rating,it makes plug rotary,ａnd also keep connection seal of inlet & outlet and middle flange.
4. Whole seal process almost have no any relation with inner pipeline pressure.
5. lnto the PTFE liner,use different fill in lining material base on the using temperature and working medium,good lubricate and long using life

設計規范 Design specification

結構特征 Structure features

主要零部件材料表 Material for main parts