美国Miller手动法兰球阀介绍：
Size & Pressure : 150#DN25-DN250 / 300# DN25-DN250 / 600# DN25-DN100
1.Bow-out proof stem
Forthe purpose of preventing the stem from flying off resulting in abnormalrising of the inner pressure of valve,shoulder is fixed at the lower part ofthe stem.In addition,in order to prevent leakage resulting from burnout ofpacking set of the stem in a fire,thrust bearing is set at the contact positionof the shoulder at lower part of the stem and valve body.Thus an inverse sealseat is formed which will prevent leakage and avoid accident.
2.Key lock
Lockscan be used to lock the manual valve when it is fully open or closed soas to prevent non-working personnel from pulling the handle which may result inmisoperation of valve.It can also avoid opening or closing of valve resultingfrom the shock from pipelines or unpredictable factors that may cause anaccident.For working pipelines such as combustible and explosive oil,gas andchemical medium,or for field piping site,the locking mechani is especiallyuseful.
3.Anti-fire safe design
Whenthe trunnion ball valve be used normally,its sealed by seat and ballsurface,seat retainer sealed by O-ring and body,this is soft sealed and reliablesealing.When the seat and O-ring are burnt,the seat retainer and body will besealed by expanded graphite.Thus act anti-fire safe purpose.
4.Anti-static device
Inorder to prevent friction among ball,stem and PTFE that generates staticelectricity which may light the combustibles and explosives that cause anaccident,in this ball valve,static-conduction spring is set between the stemand the ball,the stem and the body.Thus static electricity is conducted toground and system safety is secured.
5.Low torque in operation
Theself-lubricated bearings are installed at the friction of stem,resulting inwear resistance,fiexibility ofoperation and low torque.
6.Automatic body cavity relief
Whenthe body pressure going up un-normally as the unstable factor,the trunnion ballvalve downstream seat will be pushed by un-normally pressure,and the releasethe un-normally pressure automatically,it doesn??t damage to the sealing ofupstream seat.The unnormal pressure which in the floating ball valve body will release the pressureinto the upstream pipe directly,it doesn't damage to the sealing of thedownstream seat.
7.Various driving tes
The pad of valve designed according to ISO 5211,which is convenient forconnection and exchange of various drivers.The common driving tes aremanual,electrical,pneumatic and pneumatic/hydraulic.
更详细信息请联系代理商：深圳市中鼎阀门有限公司
