Jan. 17, 2022
Ball valves are designed to be used in a variety of applications and markets, but a V-notch ball valve offers the added ability to be used as a control valve where necessary. The main differentiator is a contoured V-notch in the ball, most commonly available with a 15°, 30°, 45°, 60°, or 90° angle, which produces an equal percentage flow characteristic for better control. V-ball valves are known to offer a variety of advantages in flow control applications, especially when compared to larger and more expensive control valves.
V-notch ball valves use the “floating ball principle, which will provide a bubble-tight shut-off in addition to the modulating flow control. When the valve is closed, upstream pressure pushes the ball against the downstream seat, thus enhancing the seal. These can control or shut off the bi-directional flow, which proves to be especially beneficial in gas applications. Comparable control valves often require additional shut-off valves; V-ball valves eliminate the need for these additional valves, saving the user cost and reducing the number of overall components in the system.
The V-notch design allows the material to flow straight through the valve, minimizing pressure drop across the valve. V-ball valves also have higher flow coefficients (Cv) compared to other control valve types of a similar size; this means that a smaller V-ball valve can be used to achieve the same flow rates as a comparable control valve of a larger size.
V-ball valves feature a quarter-turn (90°) ball rotation, allowing them to operate and shut off at much higher working pressures. Because of this, smaller lower torque actuators can be used, which results in cost savings and higher efficiency in the user’s application.
Precision machined V-ball valves are available with 60° and 90° V openings and offer equal percentage flow characteristics. As the ball rotates, desired flow rates can be achieved by positioning the ball anywhere between 0° and 90°. Response time is also increased due to the ability to use smaller actuators with these valves.
VN6 series V-notch ball control valve is a concentric segmental ball valve for modulating applications. Its V-notch segmented ball permits wide rangeability and produces an equal percentage flow characteristic. As the V-notch ball rotates into the seat ring, it creates a wedging and shearing effect to prevent dragging or slurries between the seat and the ball.
V-notch ball control valve advantage:
The v-notch ball valves are used settled and also clamped driven shaft plus sphere shaft with the splined connection made for absolutely no shed motion for very accurate placing and specific control.
The V-- Notch Sphere Valve gives non-clogging, high capability, straight with circulation control of fluids including pulp as well as paper stock or slurries and also fluids containing suspended solids or fibrous materials.
The V-shaped gap and the valve seat produce a tapered scissors function, which not only has a self-cleaning function but also prevents the ball core from being stuck, and is particularly suitable for pipeline scaling and freezing.
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