Regulating valve for regulating the flow, pressure and liquid level of the medium. According to adjust the position of the signal, the valve automatically controls the opening, so as to achieve the medium flow, pressure and liquid level regulation. Regulating valve electric control valve, pneumatic control valve and hydraulic valve, etc.. This manual mainly introduces the electric control valve and pneumatic valve two kinds of. Control valve by the electric actuator or pneumatic actuator and control valve two parts. Regulation and is usually divided into direct single seat type and straight through two seater two, the latter with large flow capacity, imbalance and stable operating characteristics, so it is especially suitable for in large flow, high pressure drop and leakage less occasions. Cv is one of the main parameters of the choice of control valve, the valve's flow capacity is defined as: when the valve is fully open, the valve at both ends of the pressure difference is 0.1MPa, the fluid density is 1g/cm3, the flow per hour of the valve flow capacity, known as the flow coefficient, Cv said, the unit is t/h, the Cv value of the liquid press. According to the Cv value of the flow capacity of the table, you can determine the nominal diameter of the control valve DN. The flow characteristics of the valve, the pressure difference between the two ends of the valve to maintain constant conditions, the flow of the medium flow through the valve and the relative flow of the relationship between the degree of. The flow characteristics of the control valve has linear characteristics, such as the percentage of properties and the parabola characteristics of three kinds of. The relative stroke and the relative flow rate is not linear, and the variation of the flow rate at each point of the stroke is proportional to the flow rate. So it has the advantage of traffic hours, traffic changes small, large flow, the flow changes, that is, in different degrees, with the same regulation accuracy. Linear relationship between the relative stroke and the relative flow rate of linear features. The change in flow rate caused by the change of the unit stroke is the same. When the flow is large, the flow is small, the flow is small, the flow is relatively large. Regulating valves including throttle valve and pressure relief valve, and its role in the regulation of the medium pressure, flow and other parameters. Regulating valve according to the structure is divided into nine categories: single seat control valve; seat regulating valve; control valve sleeve; angle valve; three-way valve; diaphragm valves; butterfly valve, ball valve, eccentric rotary valve. The first 6 are straight, and the three is the angle. Regulating valve, flow, pressure and liquid level of the medium. According to adjust the position of the signal, the valve automatically controls the opening, so as to achieve the medium flow, pressure and liquid level regulation. Control valve by the electric actuator or pneumatic actuator and control valve two parts. Regulation and is usually divided into direct single seat type and straight through two seater two, the latter with large flow capacity, imbalance and stable operating characteristics, so it is especially suitable for in large flow, high pressure drop and leakage less occasions.
Control valve belongs to control valve series, the main role is to adjust the media pressure, flow, temperature and so on parameters, is the final control element in the process loop. Control valve according to the characteristics of the stroke can be divided into: straight stroke and stroke. Straight trip including: single seat valve, two seat valve, sleeve valve, angle valve, three-way valve, diaphragm valve shape; angle stroke include: butterfly valve, ball valve, eccentric rotary valve, the function of super light valve. Valve according to the driving mode can be divided into: pneumatic control valve, electric control valve and hydraulic control valve; according to the regulation of the form can be divided into: adjustment type, cut off type, adjust the cut-off type; according to the flow characteristics can be divided into: linear, and so on, and so on. Regulating valve for air, water, steam, all kinds of corrosive media, mud, oil and other media.
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