PreFEED corporation solution for R&D to Design

Tips to Scale-up & Design

Fluid Transport / Mixing

Piping Line Pressure Balance (1711)
In a piping line which sends liquid from a column or tank to another column or tank, a control valve is provided to adjust the flow rate. The control valve changes the valve opening position to adjust the flow rate, but in the piping line, the pressure drop of other devices such as orifice flowmeters and heat exchangers will also change according to the flow rate. Therefore, it is the pressure balance between the control valve and other devices that will determine the flow rate. In this paper, we will examine the relationship between the pressure drops, the flow rate and a control valve opening position considering a typical piping line model. (K. Yokoyama)
Control Valve Characteristics (1707)
A control valve adjusts a flow rate by obtaining a control signal and changing the valve opening position. The valve sizing is determined by considering the following three factors: the Cv value, the flow characteristic, and the rangeability. Typical flow characteristics are the linear characteristic and the equal percentage characteristic. These characteristics differ greatly with respect to the valve opening position. In this document, we will discuss control valves and their design, and examine the linear and equal percentage characteristics. (K. Yokoyama)

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