Ball sector technology by Schubert & Salzer
September 2012
Valves, Actuators & Pump Control
The ball sector valve, specially designed to handle arduous duties, slurries and viscous fluids, is suitable for control and isolation. Equipped with a pneumatic or electrical actuator, it is a good choice for precise control for the paper, steel, chemical, food and effluent industries.
Construction and benefits
Ball sector valves provide outstanding performance in challenging applications. In the nearly closed position, conventional butterfly and ball segment valves expose their critical sealing components to the highest levels of wear. In order to avoid abrasion caused leakage, Schubert & Salzer’s ball sector valve technology facilitates sealing through less exposed areas of the ball sector. The design of the valve opening protects the sealing areas from wear by reduced exposure to flow velocities and thus increases life span. Twin sealed trunnion shafts protect the bearing against intrusion of media particles.
Generally ball segment or rotary globe valves use an eccentric shaft, which causes the ball or plug to lift up from the valve seat when starting to open. Thus, sealing areas are instantly exposed to permanent wear. Moreover, particles get between seal ring and ball/plug, where they cause damage leading to leakage. The ball sector valve has a centric and robust trunnion which allows the ball sector to maintain constant contact with the valve seat, eliminating contamination by the media. The permanent actuation torque is not affected by changes in the differential pressure.
This smart seal design, combined with a variety of finishing degrees for ball sector and valve seat increases the life span of the valve substantially over butterfly valves or the like. It is therefore particularly suitable for abrasive, high viscosity or fibre containing media.
For more information contact Rowan Blomquist, Macsteel Fluid Control, +27 (0)31 581 7803, [email protected], www.macsteel.co.za
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