Cast steel trunnion ball valves.
1. Easy operation
2. Spring loaded structure seat, reliable seat seal.
3. Fire safe design.
4. Reliable stem seal, blow-out proof design.
5. Anti-static feature.
6. ISO 5211 mounting pad optional.
7. Double block and bleed.
8. Self-relief in body cavity.
9. Urgent grease injection device.
Standards of casting trunnion ball valve:
Designs & manufacturing according to API 6D
Face to Face Dimension: ANSI B 16.10
Flanged End DimensionANSI B 16.5 & ANSI B 16.47
Testing & Inspection: API 598
Fire Safe Design: API 607
Casting steel trunnion mounted ball valve
Blow-out proof stemFor the purpose of preventing the stem from
flying off resulting in abnormal rising of the inner pressure of
valve,shoulder is fixed at the lower part of the stem.In
addition,in order to prevent leakage resulting from burnout of
packing set of the stem in a fire,thrust bearing is set at the
contact position of the shoulder at lower part of the stem and
valve body.Thus an inverse seal seat is formed which will prevent
leakage and avoid accident.
Lock: Locks can be used to lock the manual valve when it is fully
open or closed so as to prevent non-working personnel from pulling
the handle which may result in misoperation of valve.It can also
avoid opening or closing of valve resulting from the shock from
pipelines or unpredictable factors that may cause an accident.For
working pipelines such as combustible and explosive oil,gas and
chemical medium,or for field piping site,the locking mechanism is
Anti-fire safe design: When the trunnion ball valve be used
normally,its sealed by seat and ball surface,seat retainer sealed
by O-ring and body,this is soft sealed and reliable sealing.When
the seat and O-ring are burnt,the seat retainer and body will be
sealed by expanded graphite.Thus act anti-fire safe purpose.
Anti-static device: In order to prevent friction among ball,stem
and PTFE that generates static electricity which may light the
combustibles and explosives that cause an accident,in this ball
valve,static-conduction spring is set between the stem and the
ball,the stem and the body.Thus static electricity is conducted to
ground and system safety is secured.
Free leakage of body Sealed construction: The connective position
of valve body and bonnet is double sealed by gasket and O-ring,on
this base,such factors as fire,high temperature,shock and uneven
opening or closing of the torque all cannot induce external
Double block&bleed: When ball is full open or close
position,the transmitter substance in center cavity of body can be
released by drainage and emptying devices.In addition,the over
loaded pressure in the center cavity of valve can be released to
low pressure end by self relief seat.
Emergency sealing: Compound injection holes are designed and
compound injection valves are installed at locations of stem/cap
and body support of side valve.When sealing of stem or seat is
damaged to induce leakage,the compound can be used to do the second
time sealing.A concealed check valve is installed in side of each
compound injection valve to prevent compound from out flowing due
to the action of transmitter substance.The top of the compound
injection valve is the connector for fast connection with compound