阻塞与排泄Blocking and draining
阀门处于关闭状态时，上下游侧的阀座使流体阻断，阀体中腔的积滞物可以排泄，排泄装置具有如下机能：
事前可检查阀座是否泄漏损伤；
减少介质更换对阀门的污染；
在工作压力下，阀门处于全开或全关状态时，可更换阀杆剖填料函。(图示排泄装置是排污塞)
When the valve is closed，the seat ring on the sides of upstream and downstream makes the fluid cut off and the matters built up inside of the mid-cavity can be d rained The drainer acts
as below：
Can check if the seat ring leaks and gets injured in advance；
Reduce the pollution to the valve at the medium replacement；
When the valve is full opened or closed under the work pressure，can replace both stem and packing
box(The drainer shown in the figure is a sewage cork)

自动泄压Automatic pressure discharge
阀门中腔停滞的介质由于温度升高，而出现异常升压时，阀座或阀体上安装的安全阀可以自动泄压。
When an abnormal pressure rise occurs with the medium built up in the mid-cavity of the valve due to a rising temperature，the safety valve set on the seat ring or the body can automatically discharge the pressure

完全密封Completely sealed
球阀独特的密封方式，使流体完全阻断。
The unique way of sealing with the ball valve makes the fluid completely cut off
防火结构Fire prevention structure

万一发生火灾或由于异常升温使特氟隆阀座软化烧损时，为防止火灾的扩大，阀门操作仍然可靠，同时阀座支承可以和球体接触起瞬时密封作用，符合APl607的规定。
To prevent the fire from extending in case of a fire or when the seat ring is made softened and burntby an abnormal temperature rising，the valve can still be reliably operaled and the seat ring support can contact with the ball to produce an instantaneous sealing，conforming to API607

全通径Full DN
阀门流量孔径与管线内径一致，以便管线清扫。
The aperture of the valve is identical to the inner diameter of the pipeline，convenient for cleaning the atter