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
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
steel Temperture200~250,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