How do we in the daily work to choose a control valve products? Let the city valve co. , LTD. , said to you about! In the process industry control valve is mainly used to control the process of medium flow rate, temperature, pressure and liquid level in the equipment parameters, such as choosing a control valve, besides considering the adjustment of process medium change on was accused of parameters, the influence of the consideration process dielectric properties, gas or liquid, single-phase flow and multiphase mixture flow, whether to have corrosion, medium the operating status of such as temperature, pressure, flow, on both sides of the valve upstream and downstream pressure factors. Blackwater flow control valves, for example, due to the blackwater containing solid particles, in addition to consider the process flow, temperature, pressure, and on both sides of the valve pressure difference in the size of these parameters, but also need to consider the blackwater the influence of solid particle erosion trims, considering the control valve throttle will appear after flashing, cavitation phenomenon, if the valve before and after the pressure difference is too big, medium flash or cavitation occurred after the throttle, the valve will produce great harm, these factors need to be full consideration in the selection of control valve design. In addition the control valve to consider when the choice control valve flow characteristics for the control of process parameters, the influence of the selection of the Industrial Valves flow characteristic is equal percentage, linear, or quick opening type, condition, driving conditions for some demanding special, compared with normal traffic, if flow regulating range is very wide, requires that the valve be adjustable ratio characteristics. Design personnel in the process of control valve selection, fully understand the process conditions of the valve is used, to clearly put forward technical requirements and parameters of the valve, such as the type of control valve, as eccentric rotary valve, pass valve, axial flow Industrial Valves, balance type cage control valve, the valve body and trim material; Body size, connection, stress level; positioner, valve accessories, such as requirements, also can give some specific parameters such as regulating speed, the valve fully open or close time, noise level, etc.
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