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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]
Active control requires actuators that require energy and may operate in a time-dependent manner. [1] Active flow control includes steady or unsteady suction or blowing, [2] the use of synthetic jets, valves and plasma actuators. Actuation may be pre-determined (open-loop control) or be dependent on monitoring sensors (closed-loop control).
A unified power flow controller (UPFC) is an electrical device for providing fast-acting reactive power compensation on high-voltage electricity transmission networks. It uses a pair of three-phase controllable bridges to produce current that is injected into a transmission line using a series transformer. [ 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.
Hofherr Schrantz : Clayton Shuttleworth or HSCS was an agricultural machinery company. It was formed by the merger of two Austro-Hungarian agricultural engineering businesses in 1911.
The company was created in 1997 with the merger of two fluid motion and control companies: BW/IP and Durco International. Acquisitions include HydroTechnik Olomouc in 2006, [9] Sealing Systems in 2007, [10] Calder AG in 2009 [11] and Valbart Srl in 2010. [12] In October 2011 Flowserve acquired Lawrence Pumps Inc.