Control valve development direction

1. Small actuators: can reduce costs and improve circulation capacity;
2. Sleeve guide: the use of sleeve guide is beneficial to centering, to reduce friction, to reduce noise, and to exchange flow characteristics;
3. Balanced spool: In order to reduce the thrust or thrust torque of the actuator, it is important to use a balanced spool, which also improves the dynamic performance of the system;
4. Integrated valve core and valve seat: In order to overcome the shortcoming of poor sealing performance of the double-seat valve, the integrated valve core and valve seat of the same material are used to form the internal parts of the valve, which minimizes the leakage and unbalanced force at the same time;
5. Simple flow path: The flow path is simple and the flow resistance is reduced, which not only reduces the pressure loss at both ends of the valve, but also reduces the cost;
6. Sealing and friction: Sealing performance and friction performance are two contradictory aspects. In the design of control valves, not only the sealing problem must be solved, but also performance indicators such as friction and life must be paid attention to. Therefore, the research on stuffing boxes and packing structures has been paid attention to, and rotation Control valves are widely used;
7. Reduce noise: Use various methods to reduce control valve noise, such as using noise reduction sleeves and valve cores, using multi-stage valve cores, using noise reduction flow limiting plates, using expanders, etc.;
8. Use control valves with the same diameter as the pipeline and valve trims that limit the flow capacity: it is beneficial to reduce the valve inlet pressure and outlet fluid flow rate. There is no need to install additional pipe fittings such as reducers, which is beneficial to reducing costs. By replacing the valve with large flow capacity The valve trim can expand the flow capacity, and the error of excessive calculation of the caliber can be corrected by selecting the valve trim that limits the flow capacity;
9. In the era of digital information, more intelligent valve positioners or digital controllers will be used to realize nonlinear laws to compensate for the nonlinearity of the controlled object, while the flow characteristics of the control valve will be less used to compensate for the nonlinearity of the controlled object;
10. The material of valve trim changes with temperature. Therefore, the influence of thermal expansion at different temperatures should be considered, and the change of pressure resistance level at high temperature should also be considered. The corrosion resistance and fatigue resistance of materials should be considered.