Carbon Steel WCB Trunnion Ball Valve with Flange Ends
- Available in sizes 2 " - 24 "
- Available in PN16
- Superior flow with unique contoured ball design
- Full port
- Available with Pneumatic, Electric, Gear or Lever Actuation
- Industries: Oil & Gas, Marine, Refining, Geothermal, Power,
Chemical, Pulp & Paper, Cryogenic, Mining/Steel
- Manufactured under a certified ISO 9001 quality system
The trunnion ball valve is a form of quarter-turn valve which uses
a hollow, perforated and fixed/supported ball to control flow
A trunnion mounted valve means that the ball is constrained by
bearings and is only allowed to rotate, the majority of the
hydraulic load to be supported by the System constraints, resulting
in low bearing pressure and no shaft fatigue. The line pressure
drives the upstream seat against the stationary ball so that the
line pressure forces the upstream seat onto the ball to cause it to
The mechanical anchoring of the ball absorbs the thrust from the
line pressure, preventing excess friction between the ball and
seats, so even at full rated working pressure operating torque
remains low. This is particularly advantageous when the ball valve
is actuated because it reduces the size of the actuator and hence
the overall costs of the valve actuation package.
Trunnion ball design is the lower operating torque, ease of
operation, minimized seat wear (Stem/ball isolation prevents side
loading and wear of downstream seats improving performance and
service life), superior sealing performance at both high and low
pressure (a separate spring mechanism and upstream line pressure is
used as the sealing against the stationary ball for low pressure
and high pressure m applications).
The trunnion is available for all sizes and for all pressure
classes but they are not suitable for throttling purposes.
The trunnion ball valve is a kind of double-block-and-bleed(DDB)
valve, while the floating ball valve only seal the downstream
side.The trunnion ball valve can block both upstream and downstream
media. And when the pressure in the middle cavity is greater than
the seat spring force, the seat will be pushed open to release the
pressure inside the chamber to ensure safety.