Valve flow characteristics are appropriate, is directly related to the quality of the valve work, should be based on the characteristics of the process object, select the flow characteristics of the spool. Regulating valve flow characteristics refers to the relative flow of the medium being transferred through the valve and the relative opening of the valve. According to the different shape of the spool, mainly divided into straight line, such as percentage and quick open three. Under normal circumstances, due to the same percentage flow characteristics of the valve can adapt to changes in load larger occasions, it often give priority to consider. In view of the characteristics of the regulating object, it is very important to improve the characteristics of the whole system by considering the coordination between the regulating valve flow characteristics and the object. Object load changes, piping conditions and adjust the quality of the situation to be considered. For example, when controlling hot water heaters, or when piping resistance is large or when system load varies drastically, percentage flow characteristics should be selected. If the control is a steam heater or valve pressure difference before or after a certain change or load is small, you should select the linear flow characteristics.
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