Ball-Sector Valves

The valve for abrasive and slurry on/off and control applications.

Icon Ball Sector Valve Ball sector valves by Schubert & Salzer

The Ball Sector Valve especially designed to handle arduous duties, slurries and viscous fluids is suitable for control and isolation. This valve series is characterized by its high rangeability and a high flow capacity.

Due to their especially designed ball sectors they are self-cleaning and with pneumatic and electrical actuators, it is the best choice for very precise control in for example the mining, paper, steel, chemical, building materials and effluent industries.

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Sitzventil Schubert & Salzer


Ball sector valves provide outstanding performance in challenging applications. In a closed position conventional butterfly and ball segment valves expose their critical sealing components to the highest wear in the valve. Due to the special design of the ball sector, the seal seals through a surface part less exposed to wear. In order to avoid abrasion caused leakage, the ball sector valve facilitates sealing through less exposed areas of the ball sector. The fact that the sealing surface is not exposed to high flow velocities increases the service life of the ball sector valves significantly. Twin sealed trunnion shafts protect the bearing against intrusion of media particles.

Wear resistance

Generally ball segment or rotary globe valves use excentric shaft, which cause 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 centric and robust trunnions 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.

Life span

This smart seal design, combined with a variety of materilas and finishing degrees for ball sector and valve seat increases the life span of the valve substantially over butterfly valves or alike. It is therefore particularly suitable for abrasive, high viscosity or fiber containing media.

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