Product Description
1.Blow-out proof
stem
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For the purpose of preventing the stem from flying offÂ
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.
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2.Key lock
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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
especially useful.
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3.Anti-fire safe
design
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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.
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4.Anti-static
device
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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.
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5.Free leakage of body
Sealed construction
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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
can��t induce external leakage.
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6. Double
block&bleed(DBB)
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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.
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7.Emergency
sealing
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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 injection
gun.
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8.Automatic body cavity
relief
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When the body pressure going up un-normally as the unstable
factor,the trunnion ball valve downstream seat will be pushed
by unnormal pressure,and
the release the un-normally pressure automatically,it doesn't
damage to the sealing of upstream seat.
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9.Various driving
types
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The top pad of valve designed according to ISO ***1,which is
convenient for connection and exchange of various drivers.The
common driving types are manual,electrical,pneumatic and
pneumatic/hydraulic.
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