A process control arrangement that separates the in-plant measuring points (for example, pressure, temperature, and flow rate) and control points (for example, a valve actuator) from the recorder or indicator at the central control panel.



Related Terms

THREE-WAY VALVE

Multi-orifice (opening) flow control valve with three fluid flow openings.

ZONE VALVE

A valve that regulates the flow of hot water or steam in a control zone or heating unit of a building.

AUTOMATIC-CONTROL SERVO VALVE

A mechanically or electrically actuated servo valve controlling the direction and volume of fluid flow in a hydraulic automatic control system.

DIRECTIONAL CONTROL SERVO VALVE

A directional control valve which modulates flow or pressure as a function of its input signal.

FLOW CONTROL VALVE

A valve which purpose is to control flow rate in hydraulic system. Used to regulate how slow or how fast actuators operate f.e. hydraulic cylinder.

MULTI-PORT GOVERNOR VALVE

In large turbines, a valve controls steam flow to groups of nozzles. The number of open valves controls the number of nozzles in use according to the load. A bar-lift or cam arrangement operated by the governor opens and closes these valves in sequence. Such a device is a multi-port valve. Using nozzles at full steam pressure is more efficient than throttling the steam.

COUNTING CIRCUIT. COUNTERCURRENT EXTRACTION

A liquid-liquid extraction process in which the solvent and the process stream in contact with each other flow in opposite directions. Also known as countercurrent separation.

AUTOMATIC-CONTROL BLOCK DIAGRAM

A diagrammatic representation of the mathematical relationships defining the flow of information and energy through the automatic control system, in which the components of the control system are represented as functional blocks in series and parallel arrangements according to their position in the actual control system.

THROTTLING

A throttle valve controlling fuel or gas flow to an engine.

FORM PROCESS CHART

A graphic representation of the process flow of paperwork forms. Also known as forms analysis chart; functional forms analysis chart; information process analysis chart.

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