Development Of Control Valves

Small-sized actuator: can reduce costs and improve circulation capacity.

Sleeve guide: The sleeve guide is used to facilitate centering, reduce friction, reduce noise, and exchange flow characteristics

Balanced spool: In order to reduce the thrust or thrust of the actuator, it is important to use a balanced spool, which also improves the dynamic performance of the system

Integrated valve core and valve seat: In order to overcome the shortcomings of poor sealing performance of double-seat valves, the integrated valve core and valve seat of the same material are used to form valve trims to minimize leakage and unbalanced force.

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.

Sealing and friction: Sealing performance and frictional 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 of stuffing box and packing structure is paid more attention to, and the rotary control Valves are widely used

Noise reduction: Various methods are used to reduce the noise of the control valve, for example, noise reduction sleeves and valve cores, multi-stage valve cores, noise reduction current limiting plates, expanders, etc.

The use of control valves with the same diameter as the pipeline and valve trims that limit the flow capacity: it is helpful to reduce the valve inlet pressure and the outlet fluid flow rate, and there is no need to install additional pipe fittings such as reducers, which is beneficial to reduce costs. By replacing the inner valve with large flow capacity The flow capacity can be expanded, and the error of the calculation caliber can be corrected by selecting the limiting flow capacity valve trim

In the era of digital information technology, more intelligent valve positioners or digital controllers will be used to achieve nonlinear laws to compensate for the nonlinearity of the controlled object, and less use of control valve flow characteristics to compensate for the nonlinearity of the controlled object

The material of the valve trim changes with temperature. Therefore, the influence of thermal expansion at different temperatures should be considered, and the change of pressure resistance at high temperature should also be considered. The corrosion resistance and fatigue resistance of the material should be considered.