Habonim Catalog Interactive 2021 V04 070621 - Catalog - Page 15
Quarter Turn Valves - Introduction
Quarter-Turn Ball Valves design styles
HABONIM offers ball valves in a variety of design styles and technologies that is most effectively
supports a wide range of applications and use cases. We offer Floating ball style valves and
Trunnion-mounted ball style valves with several construction methods.
Floating Ball Valves design
The floating ball valve is the legacy style for ball valves, the most used and best fit for many
industrial applications. The design places the valve ball between seats that holds it in place
but without a firm connection to the valve body, hence, it “floats” inside the valve. Assuring
a tight seal between the seats and the ball as well as the between the seats and the valve
body guaranties the valve in-line sealing by a simple structure with minimal parts. As a rule of
thumb, a floating ball valve should be considered as first choice wherever applicable.
Trunnion-Mounted Ball Valves
In a trunnion-mounted valve, the ball rotates only around its vertical axis while being mechanically
anchored to the top and bottom of the valve body. This construction balances the torques
of the rotating ball and keeps it in a lower range than with similar sized floating ball valves
by tolerating the heavy loads applied to the valve trim as a result of large sizes, high pressures
and dynamic temperature cycles. The seats are compressed against the ball sphere by the
force of the springs and by the line pressure, providing “double block” or “double isolation”
capability to the valve. Trunnion-mounted ball valves are often used for larger sizes, higher
pressure ratings and dynamic temperatures.