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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).
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.
Griswold signals on 22nd Avenue NE, Minneapolis, pictured in 2018. In 1927, Griswold introduced the rotating banner signal. This was a unique combination of highway flasher and rotating stop sign (similar to a school bus stop sign). An approaching train would trigger not just the requisite red flashing lights and bells, but a mechanism that ...
A mass flow controller is designed and calibrated to control a specific type of liquid or gas at a particular range of flow rates. The MFC can be given a setpoint from 0 to 100% of its full scale range but is typically operated in the 10 to 90% of full scale where the best accuracy is achieved.
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.
A control loop is the fundamental building block of control systems in general and industrial control systems in particular. It consists of the process sensor, the controller function, and the final control element (FCE) which controls the process necessary to automatically adjust the value of a measured process variable (PV) to equal the value of a desired set-point (SP).
Flow control may refer to: Flow control (data), in communications Ethernet flow control; Flow control (fluid), in fluid dynamics; Air traffic flow control; See also