Control Valve features introduced concept of analysis of its structure

Regulating valve (controlvalve) for regulating media flow, pressure and liquid level. According to the signal conditioning parts, automatic control valve opening to achieve the medium flow rate, pressure and level adjustments. Sub-electric control valve regulating valve, pneumatic control valve and hydraulic control valve and so on. Regulating valve by the electric actuator or pneumatic actuator and control valve of two parts. Regulation, and is usually divided into straight-through single-block and straight-through type two kinds of two-seater, which has a flow capacity, imbalances do the characteristics of small and stable operation, it is common especially suitable for high flow, high pressure drop and leak less occasions. Flow capacity of Cv is to select one of the main parameters regulating valve, regulating valve flow capacity is defined as: When the control valve fully open when the pressure valve at both ends of 0.1MPa, fluid density 1g/cm3, the hourly flow path the number of the flow control valve, called the flow capacity, also known as the flow coefficient, to Cv, said unit t / h, liquid Cv value determined by the formula. Flow capacity of Cv values according to the size of look-up table, we can determine the control valve nominal diameter DN. Regulating valve flow characteristics is to maintain a constant pressure valve at both ends under conditions of medium flow through the flow control valve and its relative relationship between the opening. The flow control valve characteristics are linear features, such as the percentage of properties and characteristics of three kinds of the parabola. Fluence the significance of three kinds of features are as follows: (1) The equal percentage characteristics (right number) The relative percentage of properties such as stroke and not a linear relationship between the relative flow rate in the stroke unit at every point on the itinerary changes caused by changes in traffic flow to this point is proportional to the percentage change in flow rate are equal. Therefore, its advantage is that traffic hours, traffic changes in a small, traffic is heavy, then the flow rate changes, that is, in a different opening, on the same regulation accuracy. (2) linear characteristic (linear) Linearity of the relative stroke and the relative flow into the linear relationship. Unit change in the itinerary changes caused by the traffic is constant. Traffic flow, the flow rate changes in the relative value of small, traffic hours, then the flow rate variation in relative value. (3) parabolic characteristic Flow according to the proportion of change in the itinerary 2 Fang Cheng, generally has a linear and equal percentage characteristics of the middle of the feature. From the above analysis of three kinds of features can be seen in terms of its conditioning properties to the percentage of properties such as optimum, which regulate stability, regulating the performance is good. Off than the parabolic characteristics of the regulation of linearity performance is good, can use the occasion of the requirements are different, pick any of them flow characteristics ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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