Rising Stem ball valves are designed for severe industrial applications where high performance, reliability, and long service life are required. This valve type is particularly suitable for high-temperature applications, abrasive fluids with possible solid particles, zero leakage requirements, and systems subjected to frequent opening and closing operations.
The operating principle is based on a combined tilting and rotating movement of the stem and ball, eliminating direct friction between the ball and the seat during opening and closing operations. When the valve is closed, the ball remains in contact with the seat ensuring tight sealing; during opening, the ball tilts away from the seat before rotating completely, allowing smooth flow and reducing wear on sealing surfaces.
The absence of friction between the ball and seat provides low operating torque, extended component lifetime, and the possibility of using smaller actuators. The Top Entry design also allows in-line inspection and maintenance, reducing downtime and service costs.
