With the valve cage guide parts within the valve body, valve cage wall openings or window shape determines the flow characteristics. When the valve core to move away from the valve seat ring, valve cage window is opened to allow the fluid through the valve. Standard valve cage has been designed to provide a linear, equal percentage, quick opening flow characteristics inherent. Different note in Figure 3-28 valve cage window shape. By the use of the valve cage valve flow / stroke relationship is equivalent to the dynamic profile of the valve core shows linear, open and equal percentage curve.
Control valve (control valve) the valve cage guide valve parts valve assembly than traditional has an obvious advantage: the internal parts of the maintenance and replacement are greatly simplified. Inherent flow characteristics of the valve can be changed easily by installing a different cage. Swap the cage to obtain the inherent flow characteristics of different does not need to change the spool or the valve seat ring. Standard valve icon of the cage can be used for balanced or unbalanced type valve structure. Soft seat when in need can be used as a retention insert provides the valve seat ring, valve spool and cage or independent of the choice of.
Valve cage interchangeability can be extended to the special valve cage type capable of reducing noise and cavitation. The cage provides inherent flow characteristics of linear correction fluid, but in a particular direction through the valve opening of the cage. Therefore, it may be necessary to put the line body reverse to obtain the correct direction.
The characteristics of the
The valve core, a straight-through valve (control valve) moving parts assembly, can change the fluid flow limit. Valve type is designed separately, in order to provide flow characteristics, different guidance method specific or with the seat ring for cooperation, or to obtain special closed or ability to resist destruction. The valve is designed for two bit or adjusting control. In the two type of applications, a valve by the implementing agencies in the valve assembly positioned within the journey of two limit point of. In adjusting control occasions, valve can be positioned on the travel range from any specified point.
Spool surface profile near the valve seat ring helps determine a traditional straight-through valve (control valve) inherent flow characteristics. With the actuator movement of the spool in the travel range, without blocking circulation area size and shape can change, depending on the valve outline. When a constant pressure differential is maintained in the two ends of the valve, changes in the relationship between the total travel range of maximum flow capacity and percentage of can be expressed by graph, and define the inherent flow characteristics for electric regulating valve. Include the inherent flow characteristics are usually specified: linear flow characteristics - has the ideal linear inherent flow characteristics of the valve will have a direct and proportional valve stroke volume of flow in the travel range.
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