VQ671F Pneumatic V-Type Ball Valve
I. Introduction:
Pneumatic V-type ball valves are classified into soft-sealed and hard-sealed types according to sealing performance; they are divided into regulating type and shut-off type according to regulation mode. The shut-off type is further divided into single-acting and double-acting types according to action form, while the regulating type is double-acting. The unique advantage of the single-acting type is that once the power source fails, the ball valve will automatically be in the closed or open position as required by the control system. This valve features a specially shaped fixed V-notched ball and an adjustable metal seat structure. When the valve is closed, the V-notch forms a wedge-shaped shearing action with the valve seat, which can prevent jamming caused by dirt between the ball and the valve seat, and has a self-cleaning function. It is especially suitable for media containing fiber slurry, sewage and viscous particles. Equipped with a valve positioner, it can achieve continuous regulation, with small flow resistance and a wide regulation range. It is a high-quality regulating valve with wide applications.
II. Features:
1. The ball valve is composed of a V-type valve body, a pneumatic actuator and other accessories. It is an advanced control valve with a right-angle rotary structure.
2. It has excellent regulation characteristics: The V-type valve has an inherent flow characteristic approximately equal to percentage and an adjustable ratio up to 300:1. Therefore, the V-type valve can provide precise control over a wide range of changes.
3. Maximum flow volume: Due to its streamlined shape and full right-angle rotary control, the maximum volume is particularly high, the flow capacity is particularly large, and the flow resistance is small. Therefore, a smaller and more economical valve size can be used.
4. The V-type valve adopts a double-bearing structure, with high mechanical stability and low starting torque, ensuring excellent sensitivity and response speed of the valve.
5. Maximum reliability (safety): The valve body is an integrated structure, sturdy and durable. Its operation is not affected by pipeline pressure, and it can prevent valve body leakage.
6. Superior sealing performance of the metal valve seat: The V-type valve adopts a movable metal valve seat, which has a self-compensation function, superior sealing performance and an extremely long service life. In terms of flow direction, the leakage is ≤10⁻⁶ × rated flow coefficient.
7. Superb shearing ability: The V-type valve adopts a metal hard-sealed structure. During the rotation process of the V-type core and the metal valve seat, the V-notch and the valve seat generate strong shearing force to cut off impurities such as fibers, and have a self-cleaning function to avoid valve jamming.
8. The ball valve has a compact structure, is small and light, easy to install and simple to maintain.
9. The pneumatic actuator adopts a piston cylinder and crank arm conversion structure, with large output torque and small volume. The actuator adopts a fully sealed waterproof design with high protection level. The cylinder body uses an imported mirror cylinder, which is oil-free lubricated, has a small friction coefficient and corrosion resistance, and has superb durability and reliability. All transmission bearings use boundary self-lubricating bearings for oil-free lubrication, ensuring that the transmission shaft does not wear out.
III. Execution Standards:
Design and Manufacturing: GB12237-89, API608, API 6D, JPI 7S-48, BS5351, DIN3357.
Flange Dimensions: JB/T74～90 (JB74～90), GB9112～9131, HGJ44～76, SH3406, ANSI B16.5, JIS B2212～2214, NF E29-211, DIN2543.
Structural Length: GB12221-89, ANSI B16.10, JIS B2002, NF E29-305, DIN3202.
Main Inspection Tests: JB/T 9092, API 598.
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