Five big differences between trunnion
ball valve & floating ball valve
This
page will tell you the difference between the trunnion ball valve and floating
ball valve in sealing surface, look, application, working principle and
features.
Sealing area
As
the ball valve is floating, so under the force of the center, the ball will
action and in opposition to the downstream set,. So the floating ball sea valve
belongs to the one-side seal. The trunnion ball valve cannot be shifted, so the
2 sides of the ball trunnion valve both must be preserved.
Since
the sealing rule is diverse, the needs of the 2 ball valve on the sealing area
material are special, mainly the sealing area of the ball floating valve must
be capable to face the force leaded by the floating ball.
Application
The
floating ball valve is perfect for low and medium force and generally has a
little diameter. The ball trunnion valve can be applied in top force conditions
and the size can be up to sixty inches.
The
trunnion ball valve is a type of DBB valve, while the floating ball valve just
seal the downstream area. The trunnion ball valve can stop downstream and
upstream media. And when the force in the center cavity is bigger than the seat
spring force, the seat will be pushed to open to release the force inside the
chamber to make sure safety.
Working principle
The
floating ball valve just has upper stem and the ball have a slim displacement,
so it is known as floating ball valve. The ball trunnion valve has another stop
at the base to fixed the ball position, so the ball cannot move.
The
sealing of the floating ball is realized by the force of the medium, when the
ball valve is closed, the floating ball is forced against the sealing surface
under the action of force to realize sealing. When the trunnion ball valve is clogged,
the ball does not generate dislocation, but the floating seats will shift and force
against the ball within the action of the media force to realize sealing.
Characteristics
To
the floating ball valves, the ball trunnion valves are generally used longer,
has little size and simpler to operate.
The
trunnion ball valve also has the function of mechanical release force, when the
medium temperature in the valve increases and causes abnormal force rise, the
trunnion ball valve can mechanically release the force without a relief valve.
This is very vital to make sure the safety of industrial production.
Look
The
trunnion ball valve and the floating ball valve are simple to distinguish in
look. If the valve body has a fixed shaft on the bottom, it must be the ball
trunnion valve.
If
the ball valve has a gadget for injecting grease it, it is generally a trunnion
ball valve. Anyway, if there is no injecting gadget, we say it must be a
floating ball valve?
http://ballvalve.mystrikingly.com/blog/what-is-a-ball-valve-structure-and-operation-of-a-ball-valve
http://valve9112.withtank.com/what-is-a-ball-valve-working-principlespecifications/
https://ball-valve.jimdofree.com/2019/12/11/the-ball-valve-you-should-know/
https://dbbvalves.hatenablog.com/entry/2019/12/24/130553
http://api6dballvalve.iwopop.com/
