Simulation of every structural aspect.
ViarValvole ball valves
are designed in accordance
with customer specifications
and process duties, within
the provisions of the main
international standards (ANSI,
ASME, API or PED as applicable),
combining strictness in engineering
and extent in flexibility.
Our engineers work with the aid
of the most sophisticated 3-D
design programs, integrated with
Stress and Deformations simulators.
The simulation of every
structural aspect, controlling
material stress and deformation,
reaction forces and residual strains,
is the starting point of our design.
Accurate Finite Element Analysis
(FEA) software permit us to define
the dimensions of all valves
components taking into account
all the interactions between all the
pressures and the loads applied.
Particular care is taken
with the analysis of the contact
surface of ball and seats, to predict
the perfect sealing in double
block and bleed configuration
even with metal to metal seating.
The probability of leakage during
in house testing due to engineering
mistakes is therefore minimized.
are always considered in the ratio
between external spherical
diameter of the ball and the
diameter of the seat sealing area.
This ratio (within a range
of +50% and + 100% according
to pressure class) is the factor
that influences the robustness
of the trim, ensuring a longer
working life and more endurable
the risk of leakage even after
several operations of the valve.
In case of particular services
or simply upon request, fatigue
stress can be also simulated,
virtually, with a software,
or practically, with a prototype
performance test, with several
cycles of operation at different
pressure and temperature