Trunnion Ball Valves
The trunnion ball valve is a form of quarter-turn valve which uses a hollow,
perforated and fixed/supported ball to control flow through it.
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 seal.
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.
Advantages of 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.