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The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. [1]
A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure, temperature, and liquid level. In automatic control terminology, a control valve is termed ...
Fischer catalog. The Fischer Catalogue of Polish stamps (Katalog Polskich Znaków Pocztowych ISBN 83-904344-6-6) is a yearly publication in catalogue form of postage stamps relating to Poland . The purpose of the catalogue is to describe postage stamps related to Poland and to estimate their value in the philatelic market.
Relief valve - Wikipedia ... Relief valve
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Fisher Scientific
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