Does valve opening refer to angle or flow area?
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Pump station valves are often indicated by an angle to show their operating condition, while power plant valves are usually indicated by their degree of opening; it’s not clear whether these refer to the same thing. Or does the opening refer to something else, such as the flow area? I just want to confirm that the concepts expressed by both are the same, and which term is more standard
Control valves are generally indicated by their opening degree, which represents the degree to which the valve is open, or in other words, the valve’s relative travel.
Different flow characteristics result in different valve openings； ①The flow rate characteristic shows large changes at first and then becomes more stable ； ②The linear flow characteristic means that the degree of opening of the valve is proportional to the flow rate; in other words, when the valve is opened to 50%, the flow rate through the valve is also 50% ； ③The flow rate characteristic of the wait-type is the opposite of that of the immediate-opening type: there is little change at first, but it increases significantly later on. There is no definite mathematical formula for the relationship between valve opening degree and flow rate and pressure. The operating element of a butterfly valve is a disc-shaped butterfly plate that rotates around its own axis within the valve body, thereby enabling opening, closing, or regulation ； Actuators can be electric or pneumatic, etc., and they drive the valve stem and valve disc to rotate through a transmission mechanism ； The angle through which a butterfly valve moves from fully open to fully closed is usually less than 90 degrees; the opening degree refers to the angle of rotation of the butterfly disc ； Linear shutdown means that the actuator operates in a linear manner; if the potentiometer ranges from 0 to 10 kOhms, it corresponds to 0 to 90 degrees, and at 500 ohms, the opening angle is 45 degrees ； The \"opening-degree-flow rate\" curve of a butterfly valve is essentially linear within the range of 25%-75% flow rate. In other words, if the opening degree is 40%, the flow rate will be around 40% as well. When the opening degree of the butterfly valve is 0.5, it should correspond to an opening of 50%, or 45 degrees ； 【I’m just a copyist from Baidu; I learned a bit while copying. Thank you for asking the question.】
Opening degree is either a concept related to the flow area, or it represents the angle at which the valve is opened (for valves with angular motion) or the distance it moves (for valves with linear motion). Many valves come equipped with a curve that shows the relationship between flow rate and opening degree.
The opening degree of linear actuators is measured in length, while that of rotary valves is measured in angles
Valve stroke ratio; for example, half is 50%