固定球阀介绍 TRUNNION-MOUNTED
VALBART TRUNNION-MOUNTED
Valbart’s standard trunnion-mounted ball valves offer increased
value by incorporating advanced design features.
TRUNNION-MOUNTED BALL INDEPENDENT BALL AND STEM
The ball is fixed and the seat rings are floating, The ball and stem are independent to minimize
free to move along the valve axis. the effect of the side thrust generated by the
Side load generated by the pressure acting on pressure acting on the ball.
the ball is absorbed by bearings.
At low pressure, the seat sealing action is achieved
by the thrust of the springs acting on the seat rings.
As the pressure increases, the fluid pressure
pushes the seat rings against the ball.
ANTI-BLOWOUT
STEM
Stem is retained
by the stem cover
(other designs
available
on request).
—
AR ST e NS |
DESIGN
The electrical
conductance
continuity
between all the
metallic
components is
guaranteed and
certified. - / 0
4
人 AAA
o
It
NA
FLOATING SELF-RELIEVING SEAT RINGS LOW EMISSION
Two independent floating seat rings assure the bi-directional VALVES
tightness of the valve.The seats are carefully designed to Accurate machining
minimize the torque required to operate the valves without of stem and bonnet
losing sealing power, which is assured from zero differential sealing surfaces
pressure to the valve’s maximum rated pressure. ensures compliance
with the most severe
Self-relieving seats are supplied as a standard feature. pollution-control
Double piston or combination seats (self-relieving/upstream, regulations.
double piston/down-stream) can be supplied upon request.
