1,Self-relieving structure:In case of an abnormal rise of pressure in the valve body cavity,a trunnion ball valve of a self-relieving seat design will automatically relieve excess pressure to the lower pressure side of the valve,while a trunnion ball valve of a double pistion effect structure must provided with an auxiliary pressure relief device on valve body to carry out pressure relief.
2,Emergency seal system:Trunnion ball valves are designed with an auxiliary emergency seat sealing system as shown in the figure below,in case of seat damage,or seat failure in emergency circumstances,emergency seal may be effected by injecting sealant into the seating areas through auxiliary sealing system.the emergency seal assembly can also be designed with the same auxiliary emergency sealing system.
3,Firesafe tested design:Our ball valve can be firesafe design according of working circumstances and customer's needs,our firesafe ball valves are designed to meet the standards of API607 and API6FA.in case the soft seal ring burned in fire,the firesafe structure of ball valve functions to prevent leakage internally and externally,thus to avoid fire spreading.
4,Antistatic structure:When operating the valve,the media flow as well as the friction between the ball and seat can produce electrostatic charge that can be accumulated on the ball.to prevent a static spark,an antistatic device is placed in the valve to safely dissipate the electric charge accumulated on the ball(as shown in the figure).
5,Locking device:To prevent inadvertent or unexpected valve cycling,a locking device is designed at the fully opened and closed positions of hand operated ball valves.this design is proven to be especially effective in the production of flammable mediums of petroleum and chemicals,or when valves are mounted outdoors unattended.
6,Discharge device on valve body:According to the user or system requirements,a discharge valve may be mounted on the body of ball valve,pressure trapped in the valve body cavity can be released through the discharge valve.besides the function of DBB,this discharge valve also functions to rinse and blow out the deposits inside valve body cavity.
7,Corrosion resistance:The body thickness is designed with sufficient corrosion allowances for various services.the stem,trunnion,ball,seat and bottom cover of carbon steel valves are all chemical plated on the surfaces to ASTM B733 and B656 standards.use of paint from international standards may be used to deal with some conditions.
8,Sulfide stress cracking resistance:The materials of pressure retaining valve componens exposed to sour fluid are all selected according to NACE MR 0175.Rigorous quality control and inspection is implemented in the manufacturing process to make sure our products conformed to the user's standards.Trunnion mount ball valve,Size:2"~40"(DN50~DN1000),Class:150~2500,Material:WCB,CF8,CF8M,A105,304,316,Alloy steel Temperture ℃ 200~250,Applied standard:JB/T7745,GB /T12237,API 6D,API 608,API 598,ANSI B16.34,ANSI B16.10,Flange teyp:RF,RTJ,BW,Structure:two pieces,three pieces,Operation:Manual(worm gear),Pneumatic,Elecctric,Suitable Medium:water,steam,oil,acids.