Analysis of flow characteristics of eccentric rotary valves

The core design and flow characteristics of the eccentric rotary valve

Eccentric rotary valves significantly reduce seat wear and extend service life through the non-concentric design of the spool rotation center and rotating shaft. A deflector wing at the rear of the spool stabilizes fluid flow and reduces turbulence disturbances, improving the stability of flow control.

Technical advantages of flow characteristics:

1. High adjustable ratio and flow capacity: the adjustable ratio of the full-cavity eccentric rotary valve can reach 100:1, and the shrinkage type is 40:1, which is suitable for precise adjustment from small flow to large flow; Compared to single-seat valves of the same diameter, the flow capacity is significantly improved, for example, the DN100 valve has a standard Cv value of up to 230, which is suitable for process systems with slurry or highly viscous media.

2. Dynamic flow response characteristics: below 60% of the opening, the flow coefficient (Cv value) increases linearly; After exceeding 60%, the growth rate of Cv value accelerates, and the peak appears in the 85%-90% opening range, which meets the demand for rapid adjustment. The four-eccentric design further optimizes the flow area, and the Cv value is increased by more than 10% compared with the traditional three-eccentric valve at a large opening, which is especially suitable for switching scenarios that require high flow efficiency.

From misoperation prevention to intelligent control

1. Anti-misoperation design: The new eccentric rotary ball valve eliminates the risk of leakage caused by miscontact of the operating wheel and improves the sealing reliability through the design of sliding outer groove and linkage thin rod.

2. Precise flow control: The motor drives the screw to adjust the position of the valve plate, and the flow rate is fine-tuned by the number of through holes of the shielding partition, and the error rate is less than 2%, which is suitable for high-precision scenarios such as chemical additive feeding.

Selection suggestions

1.Nominal pressure and temperature: The standard body material (such as WCB) covers the working conditions from -40°C to 350°C, and the special coating can be extended to extreme environments.

2.Installation flexibility: Clamp or flange connection design, adapt to different pipeline standards (such as ANSI, JIS).

With its innovative structure and excellent flow characteristics, eccentric rotary valves have become key equipment for industrial fluid control. In the future, with the deep integration of materials science and intelligent technology, its application scenarios will be further expanded, injecting new momentum into global industrial automation.