In computer networking, flow control is the process of managing the rate of data transmission between two nodes. This should be distinguished from congestion control, which is used for controlling the flow of data when congestion has actually occurred [1]. Flow control mechanisms can be classified by whether or not the receiving node sends feedback to the sending node.

Flow control is important because it is possible for a sending computer to transmit information at a faster rate than the destination computer can receive and process them. This can happen if the receiving computers have a heavy traffic load in comparison to the sending computer, or if the receiving computer has less processing power than the sending computer . If you have come to the wrong page and wish to know more about Flow Control in the world of computers then go here http://en.wikipedia.org/wiki/Flow_control

Fluid Process Flow Control

In a process plant or any particular process, flowmeters measure velocity, volumetric or mass flow. The data or output from these measurement devices can be use to control mixing, blending, diverting ,custody transfer or to control levels in tanks, pressure in vessels and other related processes. For example , a flowmeter may be used to vary the degree of opening/closing of a device known as a control valve which is reducing or increasing the flow of fluid to a tank. In a process plant, flowmeters can play an integral part in working with or controlling final element devices such as valves, actuators and other pneumatic, electronic or mechanical devices.