Regulating Valve 1604084785, also known as the control valve, changes the fluid flow through its power operation by accepting the control signal output from the Regulating control unit. Regulating valve
160707983 is generally composed of actuators and valves. If according to the power used by the actuator, the regulating valve can be divided into pneumatic regulating valve, electric regulating valve, hydraulic regulating valve three kinds, in addition, according to its function and characteristics, linear characteristics, such as percentage characteristics and parabolic characteristics of three kinds.
The action mode of Regulating Valve 1604084785 only exists when the pneumatic actuator is selected, and its action mode is formed by the combination of the positive and negative interaction of the actuator and the positive and negative interaction of the valve. There are 4 kinds of combination forms, namely positive (gas off type), positive and negative (gas open type), anyway (gas open type), reverse (gas off type), through the four combinations of regulating valve action mode of gas open and gas off two kinds.
For the choice of regulating valve action mode, mainly from three aspects: a. Process production safety; B. Characteristics of the medium; C. Ensure product quality and minimize economic loss
(1) Adjust the choice of valve type
Regulating valve body type selection is the most important link in the selection of regulating valve. Before the selection of the valve, to control the process of medium, process conditions and parameters for careful analysis, understand the requirements of the system to regulate the valve, according to the data collected to determine the type of valve to be used. In the specific selection, the following aspects can be considered:
① The spool shape structure is mainly considered according to the selected flow characteristics and unbalanced force;
② Wear resistance when the fluid medium is a suspension containing high concentration of wear particles, the spool and the valve seat joint surface will be seriously friction every time it is closed. Therefore, the flow path of the valve should be smooth, and the internal material of the valve should be hard;
(3) Corrosion resistance due to the corrosive medium, in the case of meeting the regulation function, as far as possible to choose a simple structure valve;
(4) the temperature and pressure of the medium when the temperature and pressure of the medium is high and the change is large, the material of the spool and the valve seat should be selected by the temperature and pressure of the valve;
⑤ Prevent flash and cavitation Flash and cavitation are produced only in liquid media. In the actual production process, flash and cavitation not only affect the calculation of flow coefficient, but also form vibration and noise, so that the service life of the valve is shortened, so the valve should be prevented from flash and cavitation when choosing the valve.
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